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Earth of fire

Actualité volcanique, Articles de fond sur étude de volcan, tectonique, récits et photos de voyage

volcanic activity

Publié le par Bernard Duyck
Publié dans : #volcanic activity
Meradalur eruption - 03.08.2022 - overflight by Coast Guard helicopter / Almannavarnadeild ríkislögreglustjóra

Meradalur eruption - 03.08.2022 - overflight by Coast Guard helicopter / Almannavarnadeild ríkislögreglustjóra

A new eruption began on August 3, 2022 around 1 p.m. in the Reykjanes peninsula: a fissure, oriented northeast, opened about 3 km from Langihryggur, on the southwestern slopes of Mt. Meradalahnjúkur, dominating the valley of Meradalur.

In a press release by Kristin Jónsdóttir of the IMO, she specified that according to the first estimates, the eruption emits more lava and gas than the previous one in 2021, and that there is no immediate danger for population.

The first emotions passed, some vents of the eruptive fissure have died out, and the stabilization of the eruption will be done on some eruptive vents. The first lifts will be followed by establishment of spatter cones.

Meradalur - 03.08.2022 / around 1.15 p.m. - lava fountains on the fissure and extension of the lava field; it will be interesting to observe how the new lava will cover the old ones - click to enlarge

Meradalur - 03.08.2022 / around 1.15 p.m. - lava fountains on the fissure and extension of the lava field; it will be interesting to observe how the new lava will cover the old ones - click to enlarge

Live Fagradalsfjall, Iceland. - webcam RUV - https://www.youtube.com/watch?v=gkiwk4I8Rdk

An overflight, thanks to the helicopter of the Coast Guards, allowed the scientists to control the exact situation of the crack and its evolution.

The average lava flow during the first hours is estimated at 32 m³ per second (4 to 5 x more than at the start of the 2021 eruption).

Aerial photos from the Fisfélag TF-204 aircraft with a Hasselblad from the Institute of Natural History, allowed measurements after three and a half hours of activity: the new lava field measures 74,000 m² in Meradalur, which is not had not been completely filled by lava from the previous eruption, for an average thickness of 5.9 meters and an estimated volume of 0.43 million cubic meters.

Meradalur eruption - 03.08.2022 - overflight by Coast Guard helicopter / Almannavarnadeild ríkislögreglustjóra - one click to enlarge

Meradalur eruption - 03.08.2022 - overflight by Coast Guard helicopter / Almannavarnadeild ríkislögreglustjóra - one click to enlarge

Meradalur eruption - 03.08.2022 - overflight by Coast Guard helicopter / Almannavarnadeild ríkislögreglustjóra - one click to enlarge

Meradalur eruption - 03.08.2022 - overflight by Coast Guard helicopter / Almannavarnadeild ríkislögreglustjóra - one click to enlarge

Meradalur - 03.08.2022 - "levées" on the active fissure - RUV photo - one click to enlarge

Meradalur - 03.08.2022 - "levées" on the active fissure - RUV photo - one click to enlarge

Meradalur - 03.08.2022 - "levées" on the active fissure - photo mbls - one click to enlarge

Meradalur - 03.08.2022 - "levées" on the active fissure - photo mbls - one click to enlarge

Meradalur - Field check by LMU Volcanology this 03.08.2022 - click to enlarge

Meradalur - Field check by LMU Volcanology this 03.08.2022 - click to enlarge

At nightfall, the spectacle was pleasant for authorized observers, who share these images.

 

Sources : IMO, Kristín Jónsdóttir, Dr. Evgenia Ilyinskayambls, RUV, mbls, Almannavarnadeild ríkislögreglustjóra, Geovis lab. A. Iceland / Benjamin Hennig

Night at Meradalur - 03.08.2022 - photo LMU Volc / Project #Volta - click to enlarge

Night at Meradalur - 03.08.2022 - photo LMU Volc / Project #Volta - click to enlarge

First Map Of New Eruption Plus Likely Lava Route - Base map by Benjamin Hennig, Geovis Lab, University Iceland .

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Publié le par Bernard Duyck
Publié dans : #volcanic activity, #Sismologia
Taal Volcano - plume of gas and steam - photo CNNPH 03.08.2022

Taal Volcano - plume of gas and steam - photo CNNPH 03.08.2022

Taal volcano - sulfur dioxide or SO2 flux data for 2022 and since the 2020 eruption (inset). - Doc. Phivolcs 03.08.2022

Taal volcano - sulfur dioxide or SO2 flux data for 2022 and since the 2020 eruption (inset). - Doc. Phivolcs 03.08.2022

Taal - summary of activity as of 02.08.2022 / 05:00 - Doc. Phivolcs

Taal - summary of activity as of 02.08.2022 / 05:00 - Doc. Phivolcs

Four episodes of volcanic tremor, which lasted from 2 to 7 minutes, have been detected in Taal Volcano in the past 24 hours, the Philippine Institute of Volcanology and Seismology announced on Tuesday. The flow of sulfur dioxide averaged 12,125 tons/day on August 3. A prolific degassing in the main crater of Taal has been perceptible for three days; it causes hot volcanic fluids to rise in the lake and emit steam-rich plumes that rise 2,400 meters from Volcano Island.

Phivolcs director Renato Solidum Jr. told the Philippine News Agency that the tremors had nothing to do with the magnitude 7 earthquake that shook northern Luzon last week.


The alert level remains set at 1 (low level disturbances).

Below Alert Level 1, sudden steam-driven or phreatic explosions, volcanic earthquakes, minor ashfall and volcanic gas expulsions could threaten areas within the Taal Permanent Hazard Zone.
Entry into the permanent danger zone, especially around the main crater and the Daang Kastila fissure, remains prohibited. Occupancy and boating on Lake Taal is also prohibited.

 

Sources: Phivolcs, PNA Philippines, CNN PH

Reykjanes Peninsula - seismicity / location and magnitude of earthquakes as of 08.03.2022 / 10:30 a.m. - Doc. Icelandi Met Office
Reykjanes Peninsula - seismicity / location and magnitude of earthquakes as of 08.03.2022 / 10:30 a.m. - Doc. Icelandi Met Office
Reykjanes Peninsula - seismicity / location and magnitude of earthquakes as of 08.03.2022 / 10:30 a.m. - Doc. Icelandi Met Office

Reykjanes Peninsula - seismicity / location and magnitude of earthquakes as of 08.03.2022 / 10:30 a.m. - Doc. Icelandi Met Office

Update on the situation in the Reykjanes Peninsula:

a magnitude 5.0 earthquake occurred at 2:27 a.m. on August 2, 2022, just west of Lake Kleifarvatn. The earthquake was widely felt in the southwest of the country. Seismicity increased on the Reykjanes Peninsula around 11 p.m. last night. The activity is now located just west of Lake Kleifarvatn.

Grímsvötn's color code was changed to yellow this 02.08 due to multiple M>1 events detected this afternoon, the largest Mw 3.6 event at 14:24 UTC. This means that the seismicity of the volcano is higher than normal activity, which requires increased monitoring of the area.

The largest earthquake since the start of the seismic swarm on Saturday was of a magnitude 5.4 which occurred on Sunday at 5:48 p.m. It was located just 3 km NE of Grindavík. A total of 15 events of magnitude greater than 4 have been detected and they are located from Mount Þorbjörn to Lake Kleifarvatn.

Reykjanes Peninsula - InSAR image made from Sentinel-1 satellite images and covering the period from July 20 to August 1, 2022 - Doc. IMO

Reykjanes Peninsula - InSAR image made from Sentinel-1 satellite images and covering the period from July 20 to August 1, 2022 - Doc. IMO

A small glow visible on mblfrettir's camera turned out to be a small moss fire, origin to be determined.

The probability of an eruption increased in the Reykjanes peninsula in the late afternoon, with the presence of magma at 1km depth according to Vedurstofan. Surface deformation also continues.

 

At 05:32 on August 3, a magnitude 4.6 earthquake was located east of Fagradalsfjall. The earthquake was felt in Grindavík, Reykjanesbær, the capital region, and Selfoss.

Deformation and seismicity appear to be slowing down. This pattern was observed last year, just before the eruption.

 

Sources: IMO & Icelandic volcanoes

Sabancaya - activity from 25 to 31.07.2022 - photo I.G.P.

Sabancaya - activity from 25 to 31.07.2022 - photo I.G.P.

The I.G.Peru mentions the maintenance of the activity of Sabancaya, between July 25 and 31, 2022, at moderate levels, with an average of 27 daily explosions, accompanied by plumes of gas and ash up to 2,300 m. above the top.

Seismicity is up slightly, with a total of 320 earthquakes of volcanic origin associated with the circulation of internal magmatic fluids, and VT earthquakes, related to rock fracturing.

No significant deformation anomalies; eight thermal anomalies were identified, with a max. of 21 MW, associated with the presence of a lava dome in the crater.

The alert remains in naranja, with the maintenance of an inaccessible zone of 12 km radius around the crater.

 

Source: I.G.P.

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Publié le par Bernard Duyck
Publié dans : #volcanic activity, #Sismologia
Fuego - Landsat images - 9 bands 7,6,2 of 30.07.2022 - Doc. Insivumeh - un clic pour agrandir

Fuego - Landsat images - 9 bands 7,6,2 of 30.07.2022 - Doc. Insivumeh - un clic pour agrandir

The Fuego volcano observatory, the OVFGO, reports a weak plume at a height of 4,800 meters above sea level which disperses in a west and south-west direction. Incandescent pulses were observed at a height of 200 meters above the crater, these generate avalanches on the edge of the crater of weak to moderate characteristics. Faint sounds similar to those of a train locomotive continue to be heard constantly.

The lava flow towards the barranca Ceniza has a length of about 1.2500 meters according to the image of the Landsat-9 satellite.

It generates, at the flow front, constant weak to moderate avalanches. During the descent of these avalanches, an ash curtain is raised with a height of 500 meters from the surface, which is scattered to the west and southwest.

As a result of this activity, ash falls are reported in the areas of Panimaché I, Morelia, Santa Sofía, El Porvenir, Sangre de Cristo, Finca Palo Verde, Yepocapa and others. Due to the variability of the wind, there is a probability of ash fall in communities northwest of the volcano, such as Quisaché and neighboring communities.

 

Source : Insivumeh 30.07.2022 / 07:39 local

La Palma - opening of a road in the Tajogaite lava flows / Cumbre vieja - photo archives I Love the World

La Palma - opening of a road in the Tajogaite lava flows / Cumbre vieja - photo archives I Love the World

The Cabildo de La Palma will open the La Laguna - Las Norias highway to traffic, in both directions, continuously and without vehicle type restrictions, starting next Monday, August 1, between 6:30 a.m. and 10:00 p.m. , reports the institution in a press release. Pedestrian access is prohibited.

The opening in both directions of traffic, in the established time slot, maintains a series of rules with which traffic has been regulated, such as the prohibition to stop along the route of the road. A speed limit of 20 km/h will be established and there will be permanent monitoring on the road.

 

Source: https://www.eldiario.es/canariasahora

Fagradalsfjall - location and magnitude of earthquakes as of 07.30.2022 / 2:35 p.m. - Doc. IMO
Fagradalsfjall - location and magnitude of earthquakes as of 07.30.2022 / 2:35 p.m. - Doc. IMO
Fagradalsfjall - location and magnitude of earthquakes as of 07.30.2022 / 2:35 p.m. - Doc. IMO

Fagradalsfjall - location and magnitude of earthquakes as of 07.30.2022 / 2:35 p.m. - Doc. IMO

Around noon on July 30, a powerful series of earthquakes with lots of small seismic activity started just northeast of Fagradalsfjall, a short distance north of Fagradalsraun.

The strongest earthquake in the series was measured at a magnitude of 4.0 at 2:03 p.m. Earthquakes are now measured at a depth of about 5-7 km.

Tremors were recorded in Reykjanesbær, Grindavík, Höfðuborgarsvæðinu and as far as Borgarnes. It is believed that these earthquakes are due to a flow of magma which is located northeast of Fagradalsfjall at a depth of 5 to 7 km.
Because of this seismic swarm, there is an increased risk of rockfalls. Several earthquakes have already been measured above magnitude 3, and in earthquakes like this, landslides can occur. There have been no reports of recent rockfalls in the area yet. If there are more powerful earthquakes, the probability of a rockfall increases. People are advised to be careful on steep slopes, near steep cliffs, and to avoid areas where rocks may cave in. The National Police Commissioner, in cooperation with the Suðurnesj Police Commissioner, has declared a level of uncertainty

Civil Defense notification and a yellow VONA for Krisuvik have been issued. The National Weather Service is monitoring progress closely.

Fagradalsfjall - location and magnitude of earthquakes on 07.30.2022 / 5.20 p.m. and 07.31.2022 / 07.55 a.m. - Doc. IMO - one click to enlargeFagradalsfjall - location and magnitude of earthquakes on 07.30.2022 / 5.20 p.m. and 07.31.2022 / 07.55 a.m. - Doc. IMO - one click to enlarge
Fagradalsfjall - location and magnitude of earthquakes on 07.30.2022 / 5.20 p.m. and 07.31.2022 / 07.55 a.m. - Doc. IMO - one click to enlargeFagradalsfjall - location and magnitude of earthquakes on 07.30.2022 / 5.20 p.m. and 07.31.2022 / 07.55 a.m. - Doc. IMO - one click to enlarge

Fagradalsfjall - location and magnitude of earthquakes on 07.30.2022 / 5.20 p.m. and 07.31.2022 / 07.55 a.m. - Doc. IMO - one click to enlarge

As of July 31/7am, IMO has already located more than 2,500 earthquakes, relating to the seismic swarm in the Reykjanes Peninsula NE of the 2021 eruption site at Fagradalsfjall.

No signs of a volcanic eruption were seen on Met Office gauges, or any other signs that an eruption has started or is currently imminent, the Met Office says. (mbls)

Mýrdalsjökull - location and magnitude of earthquakes on 30.07.2022 / 09:55 - Doc. IMO
Mýrdalsjökull - location and magnitude of earthquakes on 30.07.2022 / 09:55 - Doc. IMO
Mýrdalsjökull - location and magnitude of earthquakes on 30.07.2022 / 09:55 - Doc. IMO

Mýrdalsjökull - location and magnitude of earthquakes on 30.07.2022 / 09:55 - Doc. IMO

Note : A magnitude 4.2 earthquake was measured on July 29, 2022 at 10:58 p.m. south of the Mýrdalsjökull glacier, followed by around ten earthquakes of lesser magnitude. It was felt at Mýrdalshreppur.

The Mýrdalsjökull caps the Katla volcano.
 

 

Sources: IMO & mbls

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Publié le par Bernard Duyck
Publié dans : #volcanic activity, #Word to readers
Gunung Ibu - departure on July 28 around 5:00 am towards the base camp - photo © J-M M. - one click to enlarge

Gunung Ibu - departure on July 28 around 5:00 am towards the base camp - photo © J-M M. - one click to enlarge

The team left for the base camp of Gunung Ibu around 5am in the morning.

The climb to the volcano, through the jungle, is tough on the knees, with a few scrapes and slips, on terrain that requires attention with every step.

The local porters do not seem handicapped by this environment and climb barefoot.

The night passes on the edge of the crater.

Landscape encountered on the way to Gunung Ibu - photo © J-M M. - one click to enlarge

Landscape encountered on the way to Gunung Ibu - photo © J-M M. - one click to enlarge

Gunung Ibu - PVMBG / Magma Indonesia webcam 28.07.2022 / 09:44 WIT

Gunung Ibu - PVMBG / Magma Indonesia webcam 28.07.2022 / 09:44 WIT

The Gunung Api Ibu was clearly visible on July 28, 2022, until it was covered by fog 0-III. The main crater plume was white and gray, with fine, medium to thick intensity, about 200-800 meters from the summit. The weather is sunny to rainy, the wind is light to moderate in the north, west and northwest.


The seismicity of 28.07 is characterized by:
- 64 eruption earthquakes, with an amplitude of 15-30 mm and an earthquake duration of 20-80 seconds.
- 36 avalanche earthquakes, with an amplitude of 2-11 mm and an earthquake duration of 15-80 seconds.
- 75 emission earthquakes, with an amplitude of 5 to 14 mm and an earthquake duration of 10 to 50 seconds.
- 7 harmonic episodes.
- 46 shallow volcanic earthquakes, with an amplitude of 3 to 9 mm and an earthquake duration of 4 to 12 seconds.
- 1 local tectonic earthquake, with an amplitude of 30 mm, S-P 6 seconds and an earthquake duration of 66 seconds.
- 3 distant tectonic earthquakes

 

No bulletin from the PVMBG on July 29, but the eruptive activity continued according to the statements and photos of our friends on site.

Their night photos unfortunately did not arrive ... computer problem.

Gunung Ibu - morning greyness and tinkering for a photofoot to film an eruptive episode - photo © Aris 29.07.2022 - one click to enlarge

Gunung Ibu - morning greyness and tinkering for a photofoot to film an eruptive episode - photo © Aris 29.07.2022 - one click to enlarge

Gunung Ibu - plume from an eruptive episode of 07.29.2022 - photo © J-M M. - one click to enlarge

Gunung Ibu - plume from an eruptive episode of 07.29.2022 - photo © J-M M. - one click to enlarge

Gunung Ibu - plume from an eruptive episode of 07.29.2022 - photo © J-M M. - one click to enlarge

Gunung Ibu - plume from an eruptive episode of 07.29.2022 - photo © J-M M. - one click to enlarge

Gunung Ibu - plume loaded with ash and fumaroles at the foot of the cone - photo © J-M M. 29.07.2022 - one click to enlarge

Gunung Ibu - plume loaded with ash and fumaroles at the foot of the cone - photo © J-M M. 29.07.2022 - one click to enlarge

The seismicity of July 30 is characterized by:

- 62 eruption earthquakes, with an amplitude of 15 to 30 mm and an earthquake duration of 20 to 139 seconds.

The PVMBG notes the episode of 30.07 at 7:36 p.m. WIT, accompanied by a thick plume of gray ash at around 3,000 m. above the summit, recorded on a seismograph with an amplitude of 27mm max. for 139 seconds.

In addition, the observatory provides information:
- 18 avalanche earthquakes, with an amplitude of 2 to 10 mm and an earthquake duration of 15 to 60 seconds.
- 52 emission earthquakes, with an amplitude of 5 to 14 mm and an earthquake duration of 10 to 50 seconds.
- 4 harmonic episodes
- 52 shallow volcanic earthquakes, with an amplitude of 3-18 mm and an earthquake duration of 4-10 seconds.

 

Activity level remains at 2 / waspada, with recommendations:
Communities around Mount Ibu and visitors/tourists should not travel within 2.0 km and the sectoral expansion is 3.5 km towards the crater opening in the northern part of the active crater of Mount Ibu.
In the event of ash rain, people who are active outside the home are advised to use nose, mouth (mask) and eye (goggles) protection.

 

Sources:

- PVMBG, MAgma Indonesia

- Dominique and Jean-Michel ( https://kilauea.info/2022/07/22/)

- Aris Yanto, guide, graduate in Volcanology University of Kehidupan (contact@idtreks.com - https://www.instagram.com/arisvolcano/)

Gunung Ibu - plume at 3,000 m. on 2022.07.30 / 7:36 p.m. WIT - PVMBG / Magma Indonesia webcam (cropped to avoid overexposure of the foreground)

Gunung Ibu - plume at 3,000 m. on 2022.07.30 / 7:36 p.m. WIT - PVMBG / Magma Indonesia webcam (cropped to avoid overexposure of the foreground)

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Publié le par Bernard Duyck
Publié dans : #volcanic activity

The monitoring parameters of the seismic and acoustic stations around the Fuego volcano show an increase which translates into greater degassing and incandescence observed in the crater, since the early hours of July 28.

This beautiful activity is reported by our friend Pippo Scarpinati, from Finca Montserrat, about 4 km away as the crow flies on July 28 between 3 and 7 am.

Fuego - night activity on 28.07.2022 - photo © Pippo Scarpinati - one click to enlarge

Fuego - night activity on 28.07.2022 - photo © Pippo Scarpinati - one click to enlarge

Fuego - night activity on 28.07.2022 - photo © Pippo Scarpinati - one click to enlarge

Fuego - night activity on 28.07.2022 - photo © Pippo Scarpinati - one click to enlarge

It has been gradually observed that low sounds similar to those of a train locomotive machine predominate for periods longer than 30 minutes. This increase allowed the formation of a lava flow of about 300 meters in length towards the Ceniza ravine, constantly causing avalanches of moderate characteristics in the same direction. These could cover distances close to 2 km long, with the probability of reaching the top of the hill known as "El Cucurucho".

Curtains of ash several tens of meters high can be generated from said ravine and then be dispersed over several kilometers by the wind, which would favor the constant fall of fine ash in the communes of the south-west, south and south flank. -is. this activity continues to increase and is generating new lava flows in other directions, violent ash-laden explosions, and moderate to strong avalanches to more ravines, such as Santa Teresa and Las Lajas.

Fuego - 28.07.2022 - explosion and rolling of incandescent blocks at daybreak - photo © Pippo Scarpinati - one click to enlarge

Fuego - 28.07.2022 - explosion and rolling of incandescent blocks at daybreak - photo © Pippo Scarpinati - one click to enlarge

The length of the flow reached 700 meters on July 29, generating strong avalanches towards the barranca Ceniza, and a plume of up to 4,800 m. asl.

 

Sources: Special bulletin #063-2022, daily bulletin of 29.07 & thanks for sharing this photos by Pippo Scarpinati

 Merapi - summit domes on 28.07.2022 - Doc. BPPTKG

 Merapi - summit domes on 28.07.2022 - Doc. BPPTKG

During the week of July 22 to 28, 2022, the activity of Merapi, on Java, was marked by 47 lava avalanches towards the southwest, mainly to the Bebeng river, moving 1,800 m. max.

Growth of the southwest and middle domes has resumed. The volume of the southwest lava dome is 1,672,000 m³ and that of the central dome is 2,796,000 m³.

Seismicity remained elevated. Deformation monitored by EDM showed no significant change.

Merapi - seismicity and deformation from July 22 to 28, 2022 - Doc. BPPTKG

The activity level remains at 3 / siaga.

The current potential danger is in the form of lava avalanches and hot clouds in the south-southwest sector covering the Boyong River for a maximum of 5 km, Bedog River, Krasak, Bebeng for a maximum of 7 km . The southeast sector covers the Woro River for a maximum of 3 km and the Gendol River for a maximum of 5 km. Explosions can scatter materials within 3 km of the summit.

 

Sources: BPPTKG, Magma Indonesia

Reventador - 2022.07.29 / 12:42 UTC - IGEPN webcam

Reventador - 2022.07.29 / 12:42 UTC - IGEPN webcam

At Reventador, in Ecuador, the IGEPN reports moderate surface and internal activity levels, however on the rise on the surface for July 29 / 11 a.m.

Seismicity is characterized by: 38 explosion earthquakes, 62 Long Period (LP) earthquakes, 11 emission tremor periods.

In the morning, several gas emissions with ash were recorded with heights up to 1,000 meters in a northwest direction, in addition the Washington VAAC reported an emission of 688 m above the level of the le summit in a westerly direction.

FIRMS recorded 7 thermal alerts at Reventador in the last 24 hours while MIROVA recorded 2 alerts, respectively of 34 and 37 MW.

During the night, an incandescence could be observed in the crater and a rolling of blocks 500 meters below the level of the summit. A new lava pulse is emitted from the northeast flank of the volcano.

 

Source: IGEPN

On 2022-07-28 TROPOMI detected an enhanced SO2 signal of 4.85 DU at a distance of 3.7 km from Karymsky. Other nearby SO2 sources: Avachinsky, Kizimen and Mutnovsky – Doc. Sentinel-5P Tropomi / DLR / BIRA / ESA - one click to enlarge

On 2022-07-28 TROPOMI detected an enhanced SO2 signal of 4.85 DU at a distance of 3.7 km from Karymsky. Other nearby SO2 sources: Avachinsky, Kizimen and Mutnovsky – Doc. Sentinel-5P Tropomi / DLR / BIRA / ESA - one click to enlarge

At Karymsky, moderate explosive activity was reported by KVERT on July 29 with an ash plume at 3,500-4,000 m. drifting 43 km to the southeast of the volcano.

This activity, which continues, could generate ash explosions at more than 12,000 m. asl at any time and affect air traffic.

The aviation code remains orange.

 

Source: KVERT

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Gunung Raung - photo Eko via PVMBG 09.07.2022 - one click to enlarge

Gunung Raung - photo Eko via PVMBG 09.07.2022 - one click to enlarge

Gunung Api Raung erupted on Wednesday July 27, 2022 at 5:19 p.m. WIB. The ash plume, gray and moderate, was observed at ± 1500 m above the summit (± 4832 m above sea level). This eruption was recorded on a seismograph with a maximum amplitude of 32 mm and a duration of 540 seconds.

Based on the results of seismic monitoring and analysis, as well as the unstable state of the Raung Volcano crater, as of July 29, 2022 at 08:00 WIB, the activity level of Mount Raung has increased from the level I (normal) to Level II (Alert)
Recommendation to the public and visitors/tourists: Do not descend to the bottom of the crater or approach the summit crater and do not camp around the summit/caldera lip/crater of Mt. Raung to avoid the potential danger of volcanic gases that can endanger human lives.

 

Source: PVMBG

Raung - seismicity as of 07.28.2022 - Doc. PVMBG / Magma Indonesia - one click to enlarge

Raung - seismicity as of 07.28.2022 - Doc. PVMBG / Magma Indonesia - one click to enlarge

Raung - map of risk areas updated on 29.07.2022 - Source PVMBG - one click to enlarge

Raung - map of risk areas updated on 29.07.2022 - Source PVMBG - one click to enlarge

Since May 27, 2022, a further increase in seismic activity has been recorded in the area of ​​the Chiles – Cerro Negro volcanic complex and its surroundings.

It includes the occurrence of earthquakes associated with brittle faults in the rock (volcano-tectonic type earthquakes) and earthquakes linked to fluid activity (long-period type earthquakes). The latter with shallower depths than those recorded in previous years. This activity peaked on the morning of July 25 with a 5.6 Mw (momentum magnitude) earthquake and its aftershocks.

In addition, this seismicity was accompanied by vertical deformations of the ground and changes in the composition of surface fluids associated with the hydrothermal system. Physico-chemical changes in hot springs: gaseous emissions, high temperatures and morphological changes (El Hondón) indicating disturbance of the hydrothermal system caused by seismicity and interaction with the magmatic system.

These changes suggest a magmatic source likely closer to the surface.

 

Sources: IGEPN, teleamazonas video

Chiles - Cerro Negro complex - location of earthquakes on 07.28.2022 - Doc. IGEPN

Chiles - Cerro Negro complex - location of earthquakes on 07.28.2022 - Doc. IGEPN

Complex Chiles - Cerro Negro - temperature measurement in the heat sinks of Hondón (Photos D. Sierra, M. AlmeidaIG-EPN / 13.07.2022 ) - oen  click to enlarge

Complex Chiles - Cerro Negro - temperature measurement in the heat sinks of Hondón (Photos D. Sierra, M. AlmeidaIG-EPN / 13.07.2022 ) - oen click to enlarge

Two interesting articles, respectively on the Tajogaite / Cumbre Vieja – LaPalma volcano, and on the influence of the complexity of the conduits and the topography on the extrusion of the spine at the Sheveluch dome, of which here are excerpts below and the references of the complete articles.

Digital surface model (DSM) of the 2021 eruption deposit of the Cumbre Vieja volcano. Multidirectional DSM shading. - Doctor. INGV / InVolcan - one click to enlarge

Digital surface model (DSM) of the 2021 eruption deposit of the Cumbre Vieja volcano. Multidirectional DSM shading. - Doctor. INGV / InVolcan - one click to enlarge

La Palma – Tajogaite Volcano - Aerial view of the eruptive cone formed during the eruption of the Cumbre Vieja volcano (September 19 - December 13, 2021). - Doctor. INGV - one click to enlarge

La Palma – Tajogaite Volcano - Aerial view of the eruptive cone formed during the eruption of the Cumbre Vieja volcano (September 19 - December 13, 2021). - Doctor. INGV - one click to enlarge

High-resolution digital surface model (DSM) of the 2021 eruption deposit of the Cumbre Vieja volcano, La Palma, Spain - Riccardo Civico & al.

 

“The precise identification of topographic variations associated with volcanic eruptions plays a key role in obtaining information on eruptive parameters, volcano structure, input data for modeling volcanic processes and civil protection actions. and recovery.

The 2021 eruption of the Cumbre Vieja volcano is the largest eruptive event in recorded history for the island of La Palma. In nearly 3 months, the volcano produced profound morphological changes to the landscape affecting both the natural and anthropogenic environment over an area of ​​several tens of km². We present the results of a UAS (Unoccupied Aircraft System) survey composed of more than 12,000 photographs coupled with Structure-from-Motion photogrammetry which allowed us to produce a digital surface model (DSM) at very high resolution (0. 2m/pixel). We characterized the surface topography of the newly formed volcanic landforms and produced an elevation difference map by differentiating our study and a pre-event surface, identifying morphological changes in detail.

This DSM, the first with such a high resolution to our knowledge, represents a relevant contribution for both the scientific community and local authorities."

 

Sources:

- INGV, InVolcan

- Nature - High-resolution Digital Surface Model (DSM) of the 2021 eruption deposit of Cumbre Vieja volcano, La Palma, Spain - Riccardo Civico & al.- link

Sheveluch - 24.06.2022 - extrusion with a near-vertical growing wall in the dome - photo A Matseevski

Sheveluch - 24.06.2022 - extrusion with a near-vertical growing wall in the dome - photo A Matseevski

Sheveluch - Radar amplitude observations - Doc. referenced in sources *

Sheveluch - Radar amplitude observations - Doc. referenced in sources *

Influence of conduit complexity and topography on dome spine extrusion at Shiveluch Volcano, Kamchatka

 

"Most volcanic eruptions occur through magma pathways that resemble tube-like conduits fed by magma sources at depth. Here, we combine remote sensing observations with analog and digital experiments to describe the extrusion of a spine at the lava dome of Shiveluch, Kamchatka (Russian Far East) in April-October 2020. We show that the growth of the spine is preceded by a bulging of the surface of the dome, followed by a extrusion asymmetrically.The spine then elongates along a previously identified fracture line and bends north.Through repeated morphology analysis and feature tracking, we constrained a spine diameter approximately 300 m, extruding at a speed of 1.7 m/day and a discharge rate of 0.3 to 0.7 m³/s Particle modeling of an extruded conduit plug shows that the spine may have tilted north due to topography and hidden subsurface architecture. We suggest that such complexities are rather common, where mechanical heterogeneities in the conduit material, mechanical erosion of the hidden spine buried by the co-evolving dome, as well as topographic (dis)reinforcement control the direction of the growth of the spine and its instability. The results presented here are relevant to understanding the risks of spine growth and collapse and provide unique insights into the hidden architecture of magmatic conduits."

 

Source: Nature - Influence of conduit and topography complexity on spine extrusion at Shiveluch volcano, Kamchatka - Walter, T.R., Zorn, E.U., Harnett, C.E. et al. - link


*  Sheveluch - Radar amplitude observations
Color represents calculated pixel shifts at minimum 32×32 pixel cross-correlation windows, for single, double, or triple repeat pass data pairs (with 11-day, 22-day, and 33-day time window) . The displacement U is displayed in pixels [px]. a /Moving up to 7px affects vertex region. b / The displacement increases to 8 px in 11 days (d). c / With the first extrusion of the vertebral column, the large displacements disappear. d / Minor displacement of the dome, during spine extrusion. e Spinal extrusion continues, northward migration. f Spine widens and/or bends more NE. First note the occurrence of the doming, then the extrusion of the spine (without doming). Images displayed in radar coordinates (azimuth on the x axis, range on the y axis), 1 px corresponds to approximately 1 m², descending TSX track 11 spot 042 HH. North left, east up, west down. - Doctor. Referenced in sources

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
Stromboli - lava overflow from 07.27.2022 - telecamera at Punta Labronzo, delle 17:37 UTC - Doc. LGS - one click to enlarge

Stromboli - lava overflow from 07.27.2022 - telecamera at Punta Labronzo, delle 17:37 UTC - Doc. LGS - one click to enlarge

Stromboli - Seismogram of the lava overflow from 27.07.2022 / 7:06 p.m. (yellow arrow) - Doc. LGS

Stromboli - Seismogram of the lava overflow from 27.07.2022 / 7:06 p.m. (yellow arrow) - Doc. LGS

Stromboli - lava overflow from 27.07.2022 / 7:06 p.m. - INGV webcam - one click to enlarge

Stromboli - lava overflow from 27.07.2022 / 7:06 p.m. - INGV webcam - one click to enlarge

The INGV Etneo observatory reports that Stromboli monitoring networks recorded an overflow of lava from the northern area of ​​the crater from 17:30 UTC / 19:30 local.

Note that from 17:04 UTC today (19:04 Local), the monitoring network of the Laboratory of Experimental Geophysics / LGS - Department of Earth Sciences of the University of Florence UNIFI highlights a small overflow of lava from the Central Crater area, accompanied by a modest increase in tremor and weak ground deflation.
There are currently no other changes in the monitored parameters.
The explosive activity is currently normal and the activity index remains at the average level.

 

Sources: INGV & LGS

Santiaguito - sismogram of the lahar in the rio Cabello de Ángel on 27.07.2022 - Doc. Insivumeh

Santiaguito - sismogram of the lahar in the rio Cabello de Ángel on 27.07.2022 - Doc. Insivumeh

Heavy rainfall on the volcanic complex Santa María-Santiaguito is currently generating the descent of lahars into the Cabello de Ángel river, a tributary of the Nimá I and Samalá rivers, to the south-southwest of the volcano.

This lahar is weak in character, carrying a pasty mixture of water, boulders up to 1 meter in diameter, and finer sediments, as well as tree trunks and branches. The lahar on its way produces vibrations in the ground which are recorded in the seismic stations close to the bed of the river, in this case the STG3. The lahar may increase its intensity from weak to moderate in the next few minutes and, if these rainy conditions persist in the region, the possibility of lahars descending in one of the channels that emerge from the volcanic complex is not excluded.

 

Source: Insivumeh special bulletin 27.07.2022 / 5:24 p.m. local

Askja - photo Alma Ómarsdóttir - RÚV / 26.07.2022 - one click to enlarge

Askja - photo Alma Ómarsdóttir - RÚV / 26.07.2022 - one click to enlarge

The interferogram shows surface displacements at Askja over the past 12 months - the colored fringes displayed in the Askja caldera represent inflation related to a shallow magma intrusion that began in early August 2021. OLAC GNSS station is represented by the black triangle. Approximately 35 cm of inflation has been measured at this site over the past 12 months. - Doctor. IMO / Sentinel

The interferogram shows surface displacements at Askja over the past 12 months - the colored fringes displayed in the Askja caldera represent inflation related to a shallow magma intrusion that began in early August 2021. OLAC GNSS station is represented by the black triangle. Approximately 35 cm of inflation has been measured at this site over the past 12 months. - Doctor. IMO / Sentinel

A meeting was held with scientists from the Icelandic Met Office, the Institute of Earth Sciences and the Department of Civil Protection and Emergency Management to monitor the state of the unrest in Askja. Since August 2021, an uplift of 35 cm centered west of Lake Askja has been measured.

The uplift is most likely due to pressure at the root of the volcano caused by magma intrusion which has been modeled at around 2 km depth. The uplift is rapid compared to other similar volcanoes around the world. However, an increase in seismic activity was not detected. Subsidence over the past decades at Askja may account for the low seismicity in addition to partially silent (aseismic) movement on caldera faults.

The possible scenarios are still as previously reported. If magma buildup continues, uplift may continue for some time without an eruption. Seismic activity is most likely the most significant indicator of escalating activity and an impending eruption. The most likely scenario if there will be an eruption is a fissure eruption near the crater. Observations of similar volcanoes show that considerable deformation and uplift of more than 1 m. can occur without an eruption. However, it cannot be ruled out that an eruption at Askja could occur with only a few hours notice.

Iceland's Civil Protection Department has its level of uncertainty alert in Askja and will continue to monitor the area closely with IMO, the police and Vatnajökull National Park.

 

Source: IMO

Lake Taupō - GeoNet photo - one click to enlarge

Lake Taupō - GeoNet photo - one click to enlarge

Since early May 2022, the seismic monitoring network has recorded an increase in seismic activity beneath Lake Taupō. While Lake Taupō sits above Taupō Volcano, recent earthquakes are not considered an indicator that an eruption is on the way. This activity is similar to recent periods of elevated seismic activity and ground deformation measured in 2008-2009 and 2019. The Volcanic Alert Level for the Taupō Volcanic Center remains at Level 0.

Lake Taupo - epicenters of earthquakes between 01.01.2022 and 21.07.2022 - Doc. GeoNet


 

Agnès Mazot, a volcanologist of Belgian origin working at GeoNet, explains the situation:

"Research and monitoring of the Taupō Volcanic Center has improved our understanding of this volcano. We believe that Taupō's earthquakes and uplift/subsidence are the result of a mixture of regional deformation processes and the magmatic system under the volcano.

Analysis of 2008-2009 activity indicated that Taupō volcano's behavior was influenced by a slow slip event over the Hikurangi subduction zone to the east. Some aspects of the seismic activity and ground deformation were thought to be triggered by the slow slip event, while others stemmed from volcanic processes.

The 2019 earthquake swarm was studied by researchers from the ECLIPSE project. This study showed that the earthquakes were related to the margins of a relatively solid magma slurry zone beneath the volcano. Magma slush areas, such as the one identified under Taupō, are an area of ​​nearly solid magma that contains small puddles of melt (liquid magma).

It is unclear whether the ongoing earthquakes and uplift are related to regional deformation and/or magma movement. A slow slip event is currently occurring on the Hikurangi subduction zone. However, the absence of significant ground deformation probably rules out the involvement of large-scale magma. We believe the 2022 earthquakes are similar to those of 2008-2009 and 2019, and this has helped inform our view that Volcanic Alert Level 0 is currently appropriate for Taupō Volcano.

Changes in the background activity of caldera volcanoes like Taupō are very common. There have been 16 episodes of unrest in Taupō over the past 140 years, all of which have subsided again. Taupō is an active volcano and earthquakes, and uplift or subsidence will continue to occur in the future. GNS Science, through the GeoNet program, is continuously monitoring Taupō and our other active volcanoes for signs of activity."
 

Source: GeoNet / Agnes Mazot Duty Volcanologist

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Publié le par Bernard Duyck
Publié dans : #volcanic activity, #Word to readers
Dukono - incandescence in the crater, fumaroles and degassing - photo © Aris Yanto / night from 24 to 25.07.2022

Dukono - incandescence in the crater, fumaroles and degassing - photo © Aris Yanto / night from 24 to 25.07.2022

My friends, Dominique and Jean-Michel (LAVE-Belgium), guided by the Aris Yanto team, just climbed the Dukono last eekend, on Halmahera in the Moluccas archipelago. They make us enjoy their first photos.

Dukono - 24.07.2022 - Ascent to base camp - Photo © J-M. M.

Dukono - 24.07.2022 - Ascent to base camp - Photo © J-M. M.

The climb was made, through lava fields and rivers descending the slopes, to the base camp, where it rains in the evening.

New night stage, in the wet volcanic ash, following Aris, who must guess the best way to reach the edge of the crater.

A beautiful nocturnal activity, with incandescence at the bottom of the crater, and intense degassing, reward the efforts made.

An expedition postponed two consecutive years because of a small virus, and all the more appreciated.

Dukono - 24.07.2022 - Ascent to the volcano - Photo © J-M. M.

Dukono - 24.07.2022 - Ascent to the volcano - Photo © J-M. M.

Dukono - burning crater on the night of 24 to 25.07.2022 - Photo © J-M. M.

Dukono - burning crater on the night of 24 to 25.07.2022 - Photo © J-M. M.

Dukono - burning crater on the night of July 24 to 25, 2022 - - photo © Aris Yanto
Dukono - burning crater on the night of July 24 to 25, 2022 - - photo © Aris Yanto

Dukono - burning crater on the night of July 24 to 25, 2022 - - photo © Aris Yanto

The Dukono volcano was clearly visible until it was covered in fog on July 25, according to PVMBG.

The eruptive plume observable from the main crater was white and gray, with high intensity, thick about 50-100 meters from the summit, sunny to cloudy weather.

The PVMBG has not reported an eruptive episode since 22.07.2022.

The activity level remains at 2/waspada.

 

 

Sources:

- PVMBG, MAgma Indonesia

- Dominique and Jean-Michel  ( https://kilauea.info/2022/07/22/)

- Aris Yanto, guide, graduate in Volcanology University of Kehidupan (contact@idtreks.com  -  https://www.instagram.com/arisvolcano/)

Dukono - 25.07.2022 / 08:27 - Doc. PVMBG / Magma Indonesia

Dukono - 25.07.2022 / 08:27 - Doc. PVMBG / Magma Indonesia

Dukono - Sentinel-5P TROPOMI detected an enhanced SO2 signal of 4.50DU at a distance of 35.0km from Dukono, on 24.07.2022 - Doc. DLR / BIRA / ESA / Tropomi

Dukono - Sentinel-5P TROPOMI detected an enhanced SO2 signal of 4.50DU at a distance of 35.0km from Dukono, on 24.07.2022 - Doc. DLR / BIRA / ESA / Tropomi

Dukono - seismicity on 07.26.2022 - Doc. PVMBG / Magma Indonesia

Dukono - seismicity on 07.26.2022 - Doc. PVMBG / Magma Indonesia

Dukono POS / PVMBG

Dukono POS / PVMBG

To be continued, ... the Ibu volcano.

Gunung Ibu is clearly visible on July 25, until it is covered by fog 0-III. The main crater plume is white and gray, with a fine, medium to thick intensity, of variable height between 200-2000 meters above the summit. The weather is cloudy to rainy, light to moderate winds from the north, west and northwest.

Gunung Ibu - 2022.07.25 / 20:24 WIT - PVMBG / Magma Indonesia webcam

Gunung Ibu - 2022.07.25 / 20:24 WIT - PVMBG / Magma Indonesia webcam

Seismicity is characterized by :

- 70 eruption earthquakes, with an amplitude of 15-30 mm and the duration of the earthquake 20-170 seconds.
- 20 avalanche earthquakes, with an amplitude of 2-19 mm and an earthquake duration of 15-65 seconds.
- 63 emission earthquakes, with an amplitude of 5 to 14 mm and an earthquake duration of 10 to 50 seconds.
- 11 harmonic episodes, with an amplitude of 2 to 30 mm and an earthquake duration of 65 to 350 seconds.
- 41 shallow volcanic earthquakes, with an amplitude of 3 to 9 mm and an earthquake duration of 4 to 12 seconds.
- 4 deep volcanic earthquakes, with an amplitude of 7-13 mm, S-P 1-3 seconds and an earthquake duration of 7-13 seconds.

 

Activity is at level 2/waspada, with recommendation for communities around Mount Ibu and visitors/tourists should not travel within 2.0 km and sector expansion is 3.5 km towards the opening of the crater in the northern part of the active crater of Mount Ibu.

 

Source: PVMBG

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Publié le par Bernard Duyck
Publié dans : #volcanic activity, #"Parole aux lecteurs"
 Dukono - incandescence dans le cratère, fumerolles et dégazage  - photo © Aris Yanto / nuit du 24 au 25.07.2022

Dukono - incandescence dans le cratère, fumerolles et dégazage - photo © Aris Yanto / nuit du 24 au 25.07.2022

Mes amis, Dominique et Jean-Michel  (LAVE-Belgique), guidés par l'équipe de Aris Yanto, viennent d'escalader le week-end dernier le Dukono, sur Halmahera dans l'archipel des Moluques. Ils nous font profiter de leurs premières photos.

Dukono - 24.07.2022 - Montée au camp de base - Photo © J-M. M

Dukono - 24.07.2022 - Montée au camp de base - Photo © J-M. M

La montée s'est faite, au travers des champs de lave et des rivières descendant les pentes, jusqu'au camp de base, où il pleut en soirée.

Nouvelle étape de nuit, dans la cendre volcanique humide, en suivant Aris, qui doit deviner le meilleur chemin pour atteindre le bord du cratère.

Une belle activité nocturne, avec de l'incandescence au fond du cratère, et un intense dégazage, récompensent les efforts déployés.

Une expédition remise deux années consécutives à cause d'un petit virus, et d'autant plus appréciée.

Dukono - 24.07.2022 - Montée au volcan - Photo © J-M. M.

Dukono - 24.07.2022 - Montée au volcan - Photo © J-M. M.

Dukono - cratère incendescent dans la nuit du 24 au 25.07.2022  - Photo © J-M. M.

Dukono - cratère incendescent dans la nuit du 24 au 25.07.2022 - Photo © J-M. M.

Dukono - cratère incendescent dans la nuit du 24 au 25.07.2022  - - photo © Aris Yanto
Dukono - cratère incendescent dans la nuit du 24 au 25.07.2022  - - photo © Aris Yanto

Dukono - cratère incendescent dans la nuit du 24 au 25.07.2022 - - photo © Aris Yanto

Le volcan Dukono était clairement visible jusqu'à ce qu'il soit couvert de brouillard ce 25 juillet, d'après le PVMBG.

Le panache éruptif observable du cratère principal était blanc et gris, avec une forte intensité, épais à environ 50-100 mètres du sommet, le temps ensoleillé à nuageux.

Le PVMBG ne signale pas d'épisode éruptif depuis le 22.07.2022.

Le niveau d'activité reste à 2 / waspada.

 

 

Sources :

- PVMBG, MAgma Indonesia

- Jean-Michel et Dominique ( https://kilauea.info/2022/07/22/

- Aris Yanto, guide, diplomé en Volcanologie Université de Kehidupan (contact@idtreks.com  https://www.instagram.com/arisvolcano/ )

  Dukono - 25.07.2022 / 08h27 - Doc.  PVMBG / Magma Indonesia

Dukono - 25.07.2022 / 08h27 - Doc. PVMBG / Magma Indonesia

Dukono - Sentinel-5P TROPOMI a détecté un signal SO2 amélioré de 4,50DU à une distance de 35,0km de Dukono, le 24.07.2022 - Doc. DLR / BIRA / ESA / Tropomi

Dukono - Sentinel-5P TROPOMI a détecté un signal SO2 amélioré de 4,50DU à une distance de 35,0km de Dukono, le 24.07.2022 - Doc. DLR / BIRA / ESA / Tropomi

Dukono - sismicité au 26.07.2022 - Doc. PVMBG / Magma Indonesia

Dukono - sismicité au 26.07.2022 - Doc. PVMBG / Magma Indonesia

POS du Dukono / PVMBG

POS du Dukono / PVMBG

A suivre,  ... l'Ibu.

Le Gunung Ibu est clairement visible ce 25 juillet, jusqu'à ce qu'il soit couvert par le brouillard 0-III. Le panache du cratère principal est blanc et gris, avec une intensité fine, moyenne à épaisse, de hauteur variable entre 200-2000 mètres au dessus du sommet. Le temps est nuageux à pluvieux, vents faibles à modérés de nord, ouest et nord-ouest.

Gunung Ibu - 25.07.2022 /  20h24 WIT  - webcam PVMBG / Magma Indonesia

Gunung Ibu - 25.07.2022 / 20h24 WIT - webcam PVMBG / Magma Indonesia

La sismicité est caractérisée par

- 70 séismes d'éruption, avec une amplitude de 15-30 mm et la durée du tremblement de terre 20-170 secondes.
- 20 séismes d'avalanche, avec une amplitude de 2-19 mm et une durée de tremblement de terre de 15-65 secondes.
- 63 séismes d'émission, d'une amplitude de 5 à 14 mm et une durée de tremblement de terre de 10 à 50 secondes.
- 11 épisodes harmoniques, avec une amplitude de 2 à 30 mm et une durée de tremblement de terre de 65 à 350 secondes.
- 41 séismes volcaniques peu profond, avec une amplitude de 3 à 9 mm et une durée de tremblement de terre de 4 à 12 secondes.
- 4 séismes volcaniques profonds, avec une amplitude de 7-13 mm, S-P 1-3 secondes et une durée de tremblement de terre de 7-13 secondes.

 

L'activité est au niveau 2 / waspada, avec recommandation pour les communautés autour du mont Ibu et les visiteurs/touristes ne doivent pas se déplacer dans un rayon de 2,0 km et l'expansion sectorielle est de 3,5 km vers l'ouverture du cratère dans la partie nord du cratère actif du mont Ibu.

 

Source : PVMBG

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
Sakurajima - activity from 07.26.2022 / 10:55 a.m. - 11 a.m. - Doc. JMA

Sakurajima - activity from 07.26.2022 / 10:55 a.m. - 11 a.m. - Doc. JMA

Activity continues at Sakurajima, where the observatory sent a survey team on July 25 to determine exactly where the volcanic rocks landed and to assess the damage.
The team found volcanic ash in the northern and eastern parts of the volcano but found no noteworthy changes. An aerial survey using a helicopter was hampered by clouds above the crater.

Officials warn of further eruptions of a similar magnitude, as crustal movements there indicate the volcano remains inflating even after the eruption.

 

An eruption occurred at Minamidake Crater at 10:53 a.m. local time on July 26, with a plume of gas and ash that rose 2,200 m above the crater rim.
Volcanic ash flows east from the crater (towards Kihoku, Kanoya city), and a "significant small amount" of ash (0.1-1mm, requiring traffic precautions) falls in the city from Kagoshima in one hour.

Sentinel-5P / TROPOMI detected an enhanced SO2 signal of 5.30DU at a distance of 7.3km from Sakura-jima on July 26.

Sakurajima - TROPOMI detected an enhanced SO2 signal of 5.30DU at a distance of 7.3km from the volcano on 26.07.2022 - Doc. Sentinel-5P Tropomi / DLR / BIRA / ESA

Sakurajima - TROPOMI detected an enhanced SO2 signal of 5.30DU at a distance of 7.3km from the volcano on 26.07.2022 - Doc. Sentinel-5P Tropomi / DLR / BIRA / ESA

Sakurajima - active crater - Doc. via INGVvulcani 25.07.2022

Sakurajima - active crater - Doc. via INGVvulcani 25.07.2022

Sakurajima Volcano is an open-vented volcano, located in the Aira Caldera, and largely produces its own vulcanian-like eruptions like the one that occurred on July 24. From October 1955 begins a sequence of these types of eruptions, still in progress, which sees the alternation of two active craters: the Minamidake crater and the Showa crater. It is from the Minamidake that the current volcanic cycle occurs.

 

Sources: JMA & INGVvulcani.

Popocatépetl - exhalation of gaz and ashes on 07.25.2022 / 06:50 - WebcamsdeMexico / Cenapred

Popocatépetl - exhalation of gaz and ashes on 07.25.2022 / 06:50 - WebcamsdeMexico / Cenapred

During the last 24 hours, thanks to the monitoring systems of the Popocatépetl volcano, 17 low intensity exhalations have been detected, accompanied by water vapor and volcanic gases, sometimes accompanied by ash. In addition, 18 minutes of low amplitude tremor and two volcano-tectonic earthquakes were recorded, the first recorded yesterday at 11:04 p.m. and the second today at 7:57 a.m. local time, both with a magnitude of 1.7.

During the morning and at the time of this report, an emission of water vapor, gas and sometimes a slight amount of ash was observed, which dispersed towards the west.

The volcanic alert of Popocatépetl remains in Amarillo phase 2. Cenapred urges not to approach the volcano, and in case of heavy rains, to stay away from drainages.

 

Sources: Cenapred & webcams from Mexico City.

Sabancaya - activity between 18 and 24.07.2022 - Doc. I.G.Peru

Sabancaya - activity between 18 and 24.07.2022 - Doc. I.G.Peru

According to I.G.Peru, the eruptive activity of Sabancaya remained at moderate levels between July 18 and 24, 2022, with a daily average of 30 explosions, accompanied by plumes of gas and ash up to 1,500 meters above sea level. above the top.

During the period, the observatory detected 262 volcanic earthquakes, associated with the circulation of internal magmatic fluids, and volcano-tectonic earthquakes, in connection with the fragmentation of rocks.

Deformation monitoring does not show any significant anomalies. Nine thermal anomalies, with a max. of 52 MW, have been identified, in connection with the presence of a lava dome in the crater.

The volcanic alert level remains naranja, associated with an inaccessible zone of 12 km radius around the crater.

 

Source: I.G.Peru

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