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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
Gunung Ibu - ash plume from 30.10.2022 / 6:33 p.m. WIT - PVMBG Magma Indonesia webcam - one click to enlarge

Gunung Ibu - ash plume from 30.10.2022 / 6:33 p.m. WIT - PVMBG Magma Indonesia webcam - one click to enlarge

Gunung Ibu experienced an eruptive episode on Sunday October 30, 2022 at 6:20 p.m. WIT with the height of the ash column observed at ± 2000 m above the summit (± 3325 m above sea level). It is observed that the ash column is gray in color, with a thick intensity, towards the west. This eruption was recorded on a seismograph with a maximum amplitude of 30 mm and a duration of 112 seconds.

The activity level remains at 2 / waspada; 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.

 

Source: PVMBG – Magma Indonesia

Santiaguito - Front of the lava flow towards the El Tambor channel - image Sentinel-2 bands 12,11,05 of 29.10.2022 - Doc .Insivumeh - one click to enlarge

Santiaguito - Front of the lava flow towards the El Tambor channel - image Sentinel-2 bands 12,11,05 of 29.10.2022 - Doc .Insivumeh - one click to enlarge

The Santiaguito volcano observatory reports abundant white outgassing at a height of 500 meters, which extends over 4 kilometers to the southwest.

During the night, an incandescence is observed in the crater of the Caliente dome, and in the middle and at the front of the lava flow in a west and south-west direction. Weak avalanches of blocks and ash are observed in the middle and at the base of the western lava flow. This causes the uplift of fine ash particles in the volcanic perimeter.

The volcano maintains high activity due to blocky lava extrusion in the coipole of the Caliente dome, in a west-southwest direction and unstable material in the crater. There is a likelihood of moderate to strong pyroclastic flows , so you should not stay near or in riverbeds near the slopes of the volcano.

 

Source: Insivumeh

Cerro Hudson - three active vents - photo archives Sernageomin 29.10.2011 / via GVP - one click to enlarge

Cerro Hudson - three active vents - photo archives Sernageomin 29.10.2011 / via GVP - one click to enlarge

The Sernageomin monitoring stations installed near the Hudson Volcano recorded on Sunday 10/30 at 2:50 p.m., an earthquake associated with both rock fracturing and fluid dynamics within the volcanic system (Hybrid).

Source: Sernageomin

 

N.B.: tomorrow, short break.

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Publié le par Bernard Duyck
Publié dans : #volcanic activity

The Fuego Volcano Observatory reports 5 to 8 explosions per hour of weak, moderate and some strong characteristics which generate weak and moderate rumblings and a weak shock wave causing vibrations in the roofs and windows of houses near the volcano. They expel a column of ash with a height of 4,600 to 4,800 meters above sea level, which disperses in a west and southwest direction for 20 kilometers.

As a result of these explosions, avalanches of weak, moderate and strong characteristics are generated in the contour of the crater, as well as in the ravines of Ceniza, Santa Teresa, Las Lajas, Honda, part of the material reaching the edge of the vegetation due to this activity, ash remains suspended in the ravines.

At night an incandescent pulse was also observed 200 meters higher above the crater. A noise similar to that of a train locomotive lasting 1 minute is reported.

Ash falls are reported in the communities of Panimaché I, Panimaché II Morelia, Santa Sofía, La Rochela, Ceilán, San Andrés Osuna and others in this direction.

Moderate thermal anomalies are recorded by Mirova, between 17 and 76 MW on October 28 and 29, despite the clouds which partially mask the volcano.

 

Sources: Insivumeh and Mirova

Fuego / Guatemala - explosions of 28 / 29.10.2022 - video CRELOSA Idis Epcom - https://youtu.be/oOCJ-5qxdO8

Fuego - Thermal anomalies on 30.10.2022 / 04:10 - Doc. Mirova_MODIS_Latest10NTI

Fuego - Thermal anomalies on 30.10.2022 / 04:10 - Doc. Mirova_MODIS_Latest10NTI

The eruption at Kīlauea Volcano's summit in Halema'uma'u Crater has continued for the past 24 hours. All recent eruptive activity has been confined to the crater. No significant changes were observed at the summit or in either fault zone.

Lava eruption from the west vent into the active lava lake and on the crater floor has continued over the past 24 hours. The active part of the lava lake has been stable for the past 24 hours. Flyby measurements on October 5, 2022 indicated that the crater floor had experienced a total elevation of about 143 meters and that 111 million cubic meters of lava had been spilled since this eruption began on September 29, 2021.

Mirova detected high thermal anomalies on October 28 and 29, between 80 and 265 MW.

Summit tiltmeters have recorded inflation over the past 24 hours. Volcanic tremor remains above background levels. A sulfur dioxide emission rate of approximately 700 tonnes per day (t/d) was measured on October 22, 2022.

Current volcanic alert level: Watch
Current Aviation Color Code: Orange

 

Sources: HVO and Mirova

Image of Kīlauea's summit eruption in Halema'uma'u Crater. The West Vent Complex (smoking cones in the foreground), Halema'uma'u Lava Lake and South Pond (silvery surface in the center) and the Big Island (darker lava in the upper left) and all visible in this view from the western edge. Incandescent lava spatter is visible at the eastern end of the active lava lake. USGS Photo taken by F. Trusdell on the morning of October 12, 2022.

Image of Kīlauea's summit eruption in Halema'uma'u Crater. The West Vent Complex (smoking cones in the foreground), Halema'uma'u Lava Lake and South Pond (silvery surface in the center) and the Big Island (darker lava in the upper left) and all visible in this view from the western edge. Incandescent lava spatter is visible at the eastern end of the active lava lake. USGS Photo taken by F. Trusdell on the morning of October 12, 2022.

Kilauea - Thermal anomalies as of 10.29.2022 / 11:35 p.m. - Doc. Mirova_MODIS_Latest10NTI

Kilauea - Thermal anomalies as of 10.29.2022 / 11:35 p.m. - Doc. Mirova_MODIS_Latest10NTI

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
Pavlof - image Sat. Worldview-3 bands 8,5,3 of 28.02.2022 - Doc. matt Loewen / AVO - one click to enlarge

Pavlof - image Sat. Worldview-3 bands 8,5,3 of 28.02.2022 - Doc. matt Loewen / AVO - one click to enlarge

Pavlof Volcano continues to erupt from the active vent just below the summit on its southeastern flank. Several explosions were detected daily. These explosions had higher seismic and infrasound amplitudes than previous weeks, marking an increase in explosive activity this week. An almost continuous seismic tremor was also recorded throughout the week. Cloudy conditions generally obscured views of the volcano, although low-level ash and steam emissions were observed intermittently in clear web camera views. Elevated surface temperatures have been observed in satellite data over several days over the past week.

Periods of lava spattering and fountaining from the vent on the volcano's upper eastern flank have been occurring since mid-November 2021. This activity has built a small cone and sent lava flows down the flank that are melting snow and ice and produce varying amounts of meltwater. . Meltwater usually incorporates loose debris on the volcano's flank and forms thin lahars (less than 2 m thick). The lahar deposits extend down the east-southeast flank for several kilometres, not quite to the base of the volcano.

Previous eruptions at Pavlof indicate that the level of unrest may change rapidly and progression to greater eruptive activity may occur with little or no warning.

The Volcanic Alert Level is: Watch and the Aviation Code: Orange.

 

Source: AVO

Sheveluch - photo Yu. Demyanchuk, IVS FEB RAS, KVERT - one click to enlarge

Sheveluch - photo Yu. Demyanchuk, IVS FEB RAS, KVERT - one click to enlarge

Sheveluch - Volcanic ash advisory at 29.10.2022 / 0600Z - Doc. VAAC Tokyo

Sheveluch - Volcanic ash advisory at 29.10.2022 / 0600Z - Doc. VAAC Tokyo

A strong wind lifts the ashes from the southern slopes of the Sheveluch volcano, a plume of resuspended ash extends to 3,000 m. asl. 80 km southeast of the volcano.

The growth of the lava dome continues, strong fumarolic activity and incandescence of the lava dome, explosions and hot avalanches accompany this process.
The extrusive eruption of the volcano continues. Ash explosions up to 10-15 km. a.s.l. could occur at any time. Ongoing activity could affect international and low-flying aircraft.

The aviation code remains at Orange.

 

Sources: KVERT & VAAC Tokyo

Merapi - activity from 21 to 27.10.2022 - photo BPPTKG - one click to enlarge

Merapi - activity from 21 to 27.10.2022 - photo BPPTKG - one click to enlarge

At Merapi, between October 21 and 27, 2022, 14 lava avalanches were observed in the southwest, dominant up to the Bebeng River with a maximum slip distance of 1,500 m. The sound of the avalanches was heard from Babadan post 7 times with moderate intensity.

No significant morphological changes were observed from the southwest dome and the central dome. The volume of the dome is fixed, namely for the southwest lava dome of 1,626,000 m³ and the central dome of 2,772,000 m³.

During this week, the seismicity of Mount Merapi recorded 247 deep volcanic earthquakes (VTA), 70 multiphase earthquakes (MP), 303 abortion earthquakes (RF), 25 blowing earthquakes (DG ) and 1 tectonic earthquake (TT).

Seismicity is still quite high. Mount Merapi's deformation that was monitored using EDM this week showed no significant changes.

 

The activity level remains unchanged 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 southeastern sector covers the Woro River for a maximum of 3 km and the Gendol River for 5 km.

 

Source: BPPTKG

Piton de La Fournaise - Baptism of the Piton Tikal - Doc. annotated OVPF-IPGP on a photo from 06.10.2022 - click to enlarge

Piton de La Fournaise - Baptism of the Piton Tikal - Doc. annotated OVPF-IPGP on a photo from 06.10.2022 - click to enlarge

The Cité du Volcan, the Volcanological Observatory of Piton de la Fournaise and the National Park of La Réunion, are pleased to announce the baptismal name of the new volcanic cone, resulting from the eruption from September 19 to October 5, 2022: the TIKAL peak.

Why the choice of this name?

This name refers to the tales and legends of Reunion associated with "Gran Mèr Kal". In these different "zistwar" reference is sometimes made to his son, under the name of "Ti Kala" or Tikal.

This new volcanic cone having been built near the Piton Kala Pélé, with a relatively identical shape, it is quite naturally that this name appeared.

In the midst of "somèn kréol" and on the eve of "Fèt Gran Mèr Kal", the choice of this name seems all the more relevant.

 

Sources: OVPF & Cité du Volcan

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
Gunung Ibu - 28.10.2022 / 1:16 p.m. local time - PVMBG Magma Indonesia webcam

Gunung Ibu - 28.10.2022 / 1:16 p.m. local time - PVMBG Magma Indonesia webcam

Gunung Ibu activity continues with an eruptive episode on Friday October 28, 2022 at 1:19 p.m. WIT. The height of the eruption column was observed at ± 800 m above the peak. The eruption was recorded on a seismograph with a maximum amplitude of 30 mm and a duration of 75 seconds.

 

Source: PVMBG, Magma Indonesia

Mauna Loa - photo USGS 05.10.2022

Mauna Loa - photo USGS 05.10.2022

The USGS graph shows earthquake rates over the past month at Mauna Loa. The number of earthquakes per day over the past month is indicated by the blue bars. The red line is the cumulative moment (energy) released. Data shows that there were more earthquakes per day in late September/early October compared to late October.

The USGS graph shows earthquake rates over the past month at Mauna Loa. The number of earthquakes per day over the past month is indicated by the blue bars. The red line is the cumulative moment (energy) released. Data shows that there were more earthquakes per day in late September/early October compared to late October.

Mauna Loa is not erupting and there are no signs of an imminent eruption at this time. However, Mauna Loa continues to be in a state of heightened unrest, as indicated by increased seismic activity and summit inflation. The current unrest is most likely due to a new supply of magma from 3 to 8 km below the summit of Mauna Loa. Monitoring data shows no significant changes over the past day.

In the past 24 hours, HVO has detected 19 low magnitude earthquakes (below M3.0) 2–3 miles (2–5 km) below the Mokuʻāweoweo caldera and 4–5 miles (6– 8 km) below the high altitude. northwest flank of Mauna Loa. Both of these regions have historically been seismically active during times of unrest on Mauna Loa.

Global Positioning System (GPS) instruments atop and on the flanks of Mauna Loa have continued to measure inflation at high rates since mid-September. However, summit tiltmeters show no significant surface deformation over the past week.

Sulfur dioxide, hydrogen sulfide, and carbon dioxide concentrations, as well as fumarole temperatures, remain stable at the summit and at Sulfur Cone in the upper Southwest Rift. Webcam and thermal camera views showed no change in the volcanic landscape of Mauna Loa over the past week.

"Mauna Loa continues to be in a state of heightened unrest," HVO chief scientist Ken Hon said in the observatory's latest report on the active volcano. However, Hon noted, "the current increase in activity does not suggest that progression to an eruption is certain."

HCDA posted daily snapshots via social media of Mauna Loa activity, based on HVO data, including the current alert level (as of 27.10.2022; Advisory/yellow), status and a summary of activity over the past 24 hours.

 

Sources: HVO & Big island video news

Cotopaxi - overview of 27.10.2022 by FAE - - via Th.Toulkeridis

Cotopaxi - overview of 27.10.2022 by FAE - - via Th.Toulkeridis

Flyover of Cotopaxi by the FAE on 26-27.10.2022 - rare zenith view of the nested craters and the current plume of gas and vapor - via Th.Toulkeridis

Flyover of Cotopaxi by the FAE on 26-27.10.2022 - rare zenith view of the nested craters and the current plume of gas and vapor - via Th.Toulkeridis

On October 26 and 27, IG-EPN staff conducted two reconnaissance flights around the Cotopaxi volcano. These overflights were carried out thanks to the support of the Armed Forces, the Presidency, the Ministry of Defense, the Secretariat for Communication of the Presidency and the National Service for Risk and Emergency Management

During these overflights, thermal images were taken using a portable infrared camera, CO2, SOand H2S measurements using MultiGAS equipment and observations using conventional visual cameras. : the apparent temperature of the gas emission has reached a value > 50°C. In addition, it was found that temperatures in the crater area remain at levels similar to those measured on previous occasions.

 

Cotopaxi - thermal image on 27.10.2022 - S.Vallejo via IGEPN

 

The multiGAS equipment made it possible to measure the concentrations of CO2, SO2 and H2S in the volcanic gas plume. The SO2/H2S ratios are around 4, while the CO2/SO2 ratios are between 2 and 3, being slightly higher than those obtained in 2015 during the last eruption of the volcano. These values ​​indicate a mainly magmatic origin for the gas emitted by the Cotopaxi volcano.

The emission of water vapor and other volcanic gases, is displayed continuously in recent days, indicating an increase compared to what has been observed in previous months.

 

Source: IGEPN

La Palma - Tajogaite - measurements of gaseous emanations after eruption - photo Ruben Lopez - IGNes 27.10.2022

La Palma - Tajogaite - measurements of gaseous emanations after eruption - photo Ruben Lopez - IGNes 27.10.2022

The data obtained by the geochemical monitoring networks deployed in La Palma confirm that the strong emission of carbon dioxide persists in the areas of Puerto Naos and La Bombilla after the end of the Tajogaite eruption, with CO2 concentrations of 50,000 ppm (maximum limit of the measuring equipment) and 19.4% and 15.3% oxygen, respectively, values ​​lower than the normal value established at 20.9%.

 

Source: IGN.es & R.Lopez

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Publié le par Bernard Duyck
Publié dans : #volcanic activity, #Sismologia
Anak Krakatau - eruptive episode of 2022.10.27 / 12:06 WIB - Sertung PVMBG webcam

Anak Krakatau - eruptive episode of 2022.10.27 / 12:06 WIB - Sertung PVMBG webcam

Anak Krakatau experienced a new eruptive episode on Thursday October 27, 2022 at 12:05 WIB with the height of the ash column observed at ± 250 m above the summit (± 407 m above sea level). The ash column is observed to be gray with a thick intensity towards the northeast. This eruption was recorded on a seismograph with a maximum amplitude of 37 mm and a duration of 25 seconds.

VAAC Darwin has issued an Orange Aviation Code.
Activity level remains at 3/siaga, with recommendation: Communities/visitors/tourists/climbers do not approach Mount Anak Krakatau or engage in activities within 5 km of the active crater.

 

Sources: PVMBG, Magma Indonesia and VAAC Darwin

Bezymianny -photo archives  Yu. Demyanchuk. IVS FEB RAS, KVERT

Bezymianny -photo archives Yu. Demyanchuk. IVS FEB RAS, KVERT

After its strong explosive eruption on October 23 and 24, the extrusive-effusive eruption of the Bezymianny volcano continues; strong fumarole activity, incandescence of the lava dome at night, and hot avalanches accompany this process. Sometimes the large ash clouds formed after hot avalanches, for example, such a 10x13 km ash cloud moved 70 km east of the volcano on October 26. Likely, the next strong explosive eruption could occur at any time. KVERT continues to monitor the Bezymianny volcano.

 

The extrusive-effusive eruption of the volcano continues, but the activity of the volcano remains very high. Strong ash explosions up to 10-15 km (32,800-49,200 ft) a.s.l. could occur at any time. Ongoing activity could affect international and low-flying aircraft.

Current Aviation Color Code: ORANGE
Previous Aviation Color Code: Yellow

 

Source: KVERT

Suwanosejima - eruption live on 25.10.2022 / 08:28 - Doc. vidéo JMA

The JMA reported that Suwanosejima's Ontake crater eruption continued from October 17-24.

The incandescence of the crater was visible at night. A total of 119 explosions from October 17–21 produced eruption plumes that rose up to 2 km above the crater rim and ejected blocks up to 800 m from the vent. Occasional rumbling and ash fall was reported in Toshima village (3.5 km SSW).

Only one explosion was reported from October 21 to 24. Plumes rose up to 1.5 km and boulders were ejected up to 200 m from the vent. Ash falls were reported in the village of Toshima.

The Alert Level remained at 2 and the public was warned to stay 1 km from the crater.

On October 28, a new episode occurred, filmed live by the JMA

 

Sources: JMA & Global Volcanism Program weekly report

Tungurahua - 26.10.2022 - lahar recorded by Achupashal station - Doc. IGEPN

Tungurahua - 26.10.2022 - lahar recorded by Achupashal station - Doc. IGEPN

This Wednesday, October 26, from approximately 7:00 p.m. TL, the Achupashal station in Tungurahua, Ecuador, recorded seismic signals corresponding to the descent of mudslides and debris (lahars) from the Tungurahua volcano. It is important to highlight that the Baños-Penipe highway crosses the mouth of this ravine, so the circulation of vehicles must be careful in case secondary lahars descend towards said highway.

 

Source: IGEPN – info #2022-002

Iceland - earthquakes on 26.10.2022 / 4:35 p.m. - Doc. IMO
Iceland - earthquakes on 26.10.2022 / 4:35 p.m. - Doc. IMO
Iceland - earthquakes on 26.10.2022 / 4:35 p.m. - Doc. IMO

Iceland - earthquakes on 26.10.2022 / 4:35 p.m. - Doc. IMO

Icelandic Met Office details on earthquakes in Iceland:

About 2520 earthquakes were detected by IMO's SIL seismic network last week, much more than the previous week when about 900 earthquakes were detected. About 980 earthquakes were located manually.

The difference is largely explained by an earthquake swarm near Herðubreið that started on October 22, but swarms are also underway in Reykjanes and Grímsey.

 

The week's largest earthquake was M4.1 near Herðubreið, as part of the ongoing swarm there. This is the largest earthquake detected in the region since the start of the SIL seismic network in 1991. The earthquake was felt in the northern part of Iceland. Another 11 earthquakes of M3.0 or greater were detected this week.

They were located near Herðubreið, Grímsey, Reykjanes and Reykjanes Ridge.

More seismic activity was detected in all regions compared to the previous week, except in Mýrdalsjökull. 20 earthquakes were detected in Grímsvötn and 5 in the Hekla volcano.

Askja system - seismic swarm on 27.10.2022 / 07:35 - Doc. IMO
Askja system - seismic swarm on 27.10.2022 / 07:35 - Doc. IMO
Askja system - seismic swarm on 27.10.2022 / 07:35 - Doc. IMO

Askja system - seismic swarm on 27.10.2022 / 07:35 - Doc. IMO

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Publié dans : #volcanic activity, #Sismologia
Anak Krakatau - 2022.10.25 / 07:27 WIB - webcam Sertung PVMBG / Magma Indonesia

Anak Krakatau - 2022.10.25 / 07:27 WIB - webcam Sertung PVMBG / Magma Indonesia

Anak Krakatau -25.10.2022 / 18:49 WIB - Lava93 webcam, 1 km from the crater - Magam Indonesia

Anak Krakatau -25.10.2022 / 18:49 WIB - Lava93 webcam, 1 km from the crater - Magam Indonesia

At Anak Krakatau, eruptive activity over the past two days is on the rise.

The main crater plume is white and gray, with fine, medium to thick intensity, about 25-300 meters from the summit.

Seismic observation:
- 4 eruption earthquakes, with an amplitude of 2-50 mm and an earthquake duration of 17-367 seconds.
- 10 emission earthquakes, with an amplitude of 3 to 19 mm and the duration of the earthquake from 11 to 53 seconds.
- 7 harmonic episodes, with an amplitude of 3 to 6 mm and an earthquake duration of 42 to 174 seconds.
- 21 low frequency earthquakes, with an amplitude of 2 to 8 mm and an earthquake duration of 3 to 15 seconds.
- 1 deep volcanic earthquake, with an amplitude of 51 mm, S-P 2.29 seconds and an earthquake duration of 27 seconds.
- 4 episodes of continuous tremor, with an amplitude of 0.5 to 45 mm, dominating 2 mm.

Anak Krakatau - seismicity on 25.10.2022 - Doc. PVMBG Magma Indonesia


The activity level is at 3 / siaga, with recommendation:
People/visitors/tourists/climbers do not approach Mount Anak Krakatau or engage in activities within 5 km of the active crater.

 

Sources: PVMBG, Magma Indonesia

Anak Krakatau - 26.10.2022 / 09:50 WIB- webcam Sertung PVMBG / Magma Indonesia

Anak Krakatau - 26.10.2022 / 09:50 WIB- webcam Sertung PVMBG / Magma Indonesia

Since 11:25 p.m. TL on October 25, 2022, the SAGA seismic station has recorded an increase in seismic energy at the level of the Sangay volcano. This type of high-energy signal (greater than 6,000 counts on average) is similar to that observed during pulses of increased volcanic activity.

At the moment, the GOES-16 satellite is observing an ash emission in a southwesterly direction.

An incandescence is observed, due to the emission of a lava flow on the southeast flank. It is also possible to see the fall of light ash in populated areas near the volcano located to the southwest.

It is recommended to stay informed of official sources in case of new changes.

 

Source: IGEPN

Sangay - summit incandescence and lava flow on the SE flank on 25.10.2022 / 11:42 p.m. - Doc.IGEPN

Sangay - summit incandescence and lava flow on the SE flank on 25.10.2022 / 11:42 p.m. - Doc.IGEPN

Sangay - dispersion of ashes towards the SW - GOES-16 satellite image of 26.10.2022 / 07:20 UTC - Doc. NOAA CIMSS, via IGEPN

Sangay - dispersion of ashes towards the SW - GOES-16 satellite image of 26.10.2022 / 07:20 UTC - Doc. NOAA CIMSS, via IGEPN

Between October 17 and 23, 2022, INGV OE reports that at Vulcano
the maximum temperature of the fumaroles emitted on the outer edges of La Fossa remain at stable and high values, around 375°C.
The CO2 flux in the crater area remains at medium-high values.
The SO2 flux in the crater area is stable at a moderately medium-high level


Geochemistry of fumarolic gases: The concentration of CO2 and He is constant or slightly increasing and remains at an average level. The carbon isotope ratio is constant at high values ​​and the He isotope ratio is stable at medium levels
The CO2 flux at the base of the La Fossa cone and in the Vulcano Porto area: The CO2 fluxes recorded in the Rimessa, C. Sicilia sites always show values ​​above background levels. The P4max site displays average values, while at the Faraglione site there are values ​​close to the bottom.


Geochemistry of thermal aquifers: in the well of Camping Sicilia there are always high values ​​of temperature and conductivity at medium-low levels; in the Bambara well, the level and conductivity values ​​show no significant variations.


Local seismicity: Low rate of occurrence of local micro-seismicity.
Regional Seismicity: No earthquakes with Ml >= 1.0 were located in the Vulcano region last week.
The GNSS network does not show significant variations.

 

Source: INGV OE weekly bulletin 25.10.2022

Vulcano - fumaroles on the edge of the crater of La Fossa - photo archives INGV OE

Vulcano - fumaroles on the edge of the crater of La Fossa - photo archives INGV OE

In total, more than 1,400 earthquakes have occurred in the vicinity of Herðubreið / Askja System since the earthquakes began last Saturday. Apart from the largest 4.1M earthquake that struck on Saturday evening, two recorded magnitudes above 3.

According to Kristín Elísa Guðmundsdóttir, a natural hazard specialist at the Icelandic Met Office, there is no unrest there. Although these series of earthquakes are more intense than usual, there are frequent bursts in the area of ​​the Askja system.

 

Sources: mbls & IMO

Askja system - location of earthquakes on 26.10.2022 / 07:20 - Doc. IMO

Askja system - location of earthquakes on 26.10.2022 / 07:20 - Doc. IMO

Askja system - number and magnitude of earthquakes from 24 to 26.10.2022 / 07:20 - Doc. IMO
Askja system - number and magnitude of earthquakes from 24 to 26.10.2022 / 07:20 - Doc. IMO
Askja system - number and magnitude of earthquakes from 24 to 26.10.2022 / 07:20 - Doc. IMO
Askja system - number and magnitude of earthquakes from 24 to 26.10.2022 / 07:20 - Doc. IMO

Askja system - number and magnitude of earthquakes from 24 to 26.10.2022 / 07:20 - Doc. IMO

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Alaid - thermal anomalies in the crater and at the flow - Sentinel-2 nir / Copernicus image - one click to enlarge

Alaid - thermal anomalies in the crater and at the flow - Sentinel-2 nir / Copernicus image - one click to enlarge

Alaid - thermal anomalies on 24.10.2022 / 11:45 a.m. - Doc. Mirova _MODIS_VRP

Alaid - thermal anomalies on 24.10.2022 / 11:45 a.m. - Doc. Mirova _MODIS_VRP

Explosive activity continues on October 24 at the Alaid volcano in the Kuriles.

Satellite data from KVERT showed an ash plume at 3,000-3,500 m. asl., extended about 72 km east-northeast of the volcano.
A moderate eruptive activity of the volcano continues. Ash explosions up to 8 km (26,200 ft) above sea level could occur at any time. Ongoing activity could affect international and low-flying aircraft.

The aviation code remains orange.

 

Source: KVERT

Anak Krakatau - ash plume from 24.10.2022 / 5:57 p.m. WIB - Sertung PVMBG / Magma Indonesia webcam - one click to enlarge

Anak Krakatau - ash plume from 24.10.2022 / 5:57 p.m. WIB - Sertung PVMBG / Magma Indonesia webcam - one click to enlarge

Anak Krakatau erupted on Monday, October 24, 2022 at 5:57 p.m. WIB with the height of the ash column observed at ± 150 m above the summit (± 307 m above sea level). It is observed that the ash column is black with a thick intensity towards the northeast. This eruption was recorded on a seismograph with a maximum amplitude of 20 mm and a duration of 32 seconds.

The seismicity of October 24 is characterized by:

- 2 eruption earthquakes, with an amplitude of 20-44 mm and an earthquake duration of 32-47 seconds.
- 23 blast/emission earthquakes, with an amplitude of 4 to 42 mm and an earthquake duration of 9 to 44 seconds.
- 22 low frequency earthquakes, with an amplitude of 2 to 14 mm and an earthquake duration of 4 to 32 seconds.
- 1 shallow volcanic earthquake with an amplitude of 2 mm and an earthquake duration of 5 seconds.
- and 4 episodes of continuous tremor, with an amplitude of 0.5 to 5 mm, mainly 1.5 mm.

 

On October 25, the main crater plume was observed white in color, with thin to thick intensity about 25-100 meters from the summit.
 

The activity level remains at 3 / siaga, with recommendation:
Communities/visitors/tourists/climbers do not approach Mount Anak Krakatau or engage in activities within 5 km of the active crater.

 

Sources: PVMBG, Magma Indonesia, VAAC Darwin

Sabancaya - activity from 17 to 23.10.2022 - Doc. I.G.Peru

Sabancaya - activity from 17 to 23.10.2022 - Doc. I.G.Peru

The eruptive activity of Sabancaya was maintained at moderate levels between October 17 and 23, 2022, with an average of 40 daily explosions, accompanied by plumes of ash and gas up to 2,900 m. above the top.

During this period, the IGP detected 291 earthquakes of volcanic origin associated with the circulation of internal magmatic fluids, and VT earthquakes related to rock fracturing.

No significant deformation anomalies. Six thermal anomalies, max. of 15 MW, are associated with the presence of a dome on the surface of the crater.

The volcanic alert remains in Naranja, as does the radius of the non-accessible zone of 12 km.

 

Source: I.G.Peru

Villarrica - thermal anomaly in the crater - Sentinel-2 bands 12,11,8A image from 22.10.2022 / 2:27 p.m. - via Mounts Project

Villarrica - thermal anomaly in the crater - Sentinel-2 bands 12,11,8A image from 22.10.2022 / 2:27 p.m. - via Mounts Project

Villarica - incandescence and lava projections on 23.10.2022 02:16 - Doc. POVI

Villarica - incandescence and lava projections on 23.10.2022 02:16 - Doc. POVI

Sentinel-2 detected the highest radiation since September 13, 2019 at Volcán Villarrica.

Tourists report having observed lava spattering ejected from a depth of about 80 meters, and loud degassing noises. The bottom of the crater is in a slow process of ascent.

The dominant Strombolian activity generates ash- and lapilli-sized pyroclastic deposits on the upper flanks of the volcano.

 

Sources: POVI and photos by Laura Angarita.

Villarica - the summit of the volcano blackened by ashes and lapilli deposits - photo Laura Angarita 24.10.2022

Villarica - the summit of the volcano blackened by ashes and lapilli deposits - photo Laura Angarita 24.10.2022

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Publié le par Bernard Duyck
Publié dans : #volcanic activity, #Sismologia
Bezymianny - thermal anomalies as of 24.10.2022 / 02:50 - Doc.Mirova_MODIS_Latest10NTI

Bezymianny - thermal anomalies as of 24.10.2022 / 02:50 - Doc.Mirova_MODIS_Latest10NTI

A strong explosive eruption occurred on October 23, 2022 at Bezymianny, in the Kamchatka Peninsula. The explosions sent ash up to 10 km a.s.l.; the ash plume extended 10 km east northeast of the volcano.

The explosive eruption of the volcano continues. Ongoing activity could affect international and low-flying aircraft.

KVERT changed the aviation code from Orange to Red at 12:20 UTC.

 

The observatory announces in a new statement on October 23 at 22:05 UTC that the strong explosive eruption of the volcano has ended. Satellite and visual data showed an extensive gas-steam plume to the northeast of the volcano, and a bright thermal anomaly over the volcano.
An extrusive-effusive eruption of the volcano continues. Ongoing activity could affect low-flying aircraft, and the aviation code has changed back to Orange.

 

Source: KVERT

October 23, 2022, ~ Eruption ~ Bezymianny Volcano, Russia ~ 11:00 - 14:00 UTC

In the early hours of the morning of October 22, the Cotopaxi volcano cleared for a moment and a steam emission was observed 1000 meters in a westerly direction. Then the Washington VAAC reported 2 ash emissions with heights up to 2353 meters above the summit in a northeast and west direction.

Seismicity is characterized by 46 Long Period earthquakes, 1 Volcano-tectonic earthquake, and an episode of emission tremor.


Rains were recorded in the area, which did not generate lahar.
For the moment, the volcano sector remains cloudy, which is why visual observations cannot be made. Last night, a slight ash fall was reported at the José Rivas refuge.

On Sunday October 23, the summit of the Cotopaxi volcano appeared, on the Sincholagua camera, with a layer of dark gray ash, the result of the emissions of the previous days.
The October 21 emissions were accompanied by a seismic signal called a volcanic tremor, which lasted 4 hours and then decreased in intensity in the early hours of October 22.
 
The seismicity over 21 hours is characterized by 481 explosion earthquakes, 34 LP earthquakes, 77 episode of tremor of emission, and one in corrélation with a lahar.


The IGEPN announces that light rain has been recorded via the Windy application. A high frequency signal was observed at the BREF seismic station, possibly related to small secondary lahars which are caused by weathering of the ice sheet by the ash cover at the summit.

A slight emission of gas and water vapor was observed at a height of 500 meters above the summit towards the east.

The alert level has been changed to amarilla.

 

Source: IGEPN

Herðubreid region / Iceland - location of the seismic swarm and magnitude of the earthquakes on 24.10.2022/ 06:45 - Doc. IMO
Herðubreid region / Iceland - location of the seismic swarm and magnitude of the earthquakes on 24.10.2022/ 06:45 - Doc. IMO
Herðubreid region / Iceland - location of the seismic swarm and magnitude of the earthquakes on 24.10.2022/ 06:45 - Doc. IMO

Herðubreid region / Iceland - location of the seismic swarm and magnitude of the earthquakes on 24.10.2022/ 06:45 - Doc. IMO

On October 22 at 11:11 p.m., a magnitude 4.1 earthquake was measured, just north of Herðubreid. Notifications have been received by the Meteorological Bureau that the earthquake has been detected in Akureyri. A total of three earthquakes were measured above magnitude 3.

Considerable post-seismic activity was observed in the area overnight, and the Norwegian Meteorological Agency's automatic earthquake system located around 600 earthquakes in the area north of Herðubreid.


Herðubreid is part of the Askja system, which shows certain signs that it is preparing for activity. "I can definitely say that there will be an eruption in this area, but when it will happen it's harder to say," says volcanologist Þorvaldur Þórðarson about the possibility of an eruption at Herðubreid.

The Askja and Grimstvötn systems are in yellow aviation code (Icelandic volcanoes)


Sources:
- IMO by geoscientist on duty on 23 October 08:
- mbls / volcanologist Þorvaldur Þórðarson
- Icelandic volcanoes

Herðubreið - Painting by Sveinn Thorarinsson 1926

Herðubreið - Painting by Sveinn Thorarinsson 1926

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Bezymianny - 23.10.2022 / 06:49 - webcam seismic station Severnaya Griva - Doc. KB GS RAS

Bezymianny - 23.10.2022 / 06:49 - webcam seismic station Severnaya Griva - Doc. KB GS RAS

Bezymianny - improved SO2 signal of 5.71 DU at 800m. of the volcano - Sentinel5P Tropomi image of 23.10.2022 - Doc. DLR / BIRA / ESA

Bezymianny - improved SO2 signal of 5.71 DU at 800m. of the volcano - Sentinel5P Tropomi image of 23.10.2022 - Doc. DLR / BIRA / ESA

In Kamchatka, Bezymianny activity is on the rise. Aviation color code changed from yellow to orange. For the moment, no ash cloud is reported.

The temperature of the thermal anomalies increases gradually; nocturnal incandescence and strong sporadic fumarolic activity were observed on October 22.

On 2022-10-23, Sentinel-5P Tropomi detected an enhanced SO2 signal of 5.71 DU at a distance of 0.8 km from the Bezymianny.

Due to this increase in activity, the aviation code has been raised? Strong ash explosions could occur at any time, accompanied by plumes up to 10-15 km. and affect air traffic.

 

Source: KVERT

Kerinci - ash and gas plume  22.10.2022  / 06h59 WIB - Doc. PVMBG / Magma Indonesia

Kerinci - ash and gas plume 22.10.2022 / 06h59 WIB - Doc. PVMBG / Magma Indonesia

Kerinci - seismicity on 22.10.2022 - Doc. PVMBG / Magma Indonesia

Kerinci - seismicity on 22.10.2022 - Doc. PVMBG / Magma Indonesia

At Kerinci, on Sumatra, the main crater plume was gray on October 22, with moderate to high intensity, about 400-500 meters from the summit.

Seismicity is characterized by:
- 203 emission earthquakes, with an amplitude of 0.5 to 7 mm and an earthquake duration of 10 to 26 seconds.
- an episode of continuous tremor, with an amplitude of 0.5 to 2 mm, dominant at 1 mm.

The activity is at level 2 / waspada. VAAC Darwin's aviation code is orange.
Recommendations:
- Communities around Kerinci Volcano and visitors/tourists are not allowed to climb the summit crater of Kerinci Volcano within 3 km of the active crater (people are prohibited from activities within the danger radius/KRB III ).
- It is best to avoid the flight path around the Kerinci Volcano as at any time it still has the potential for ash eruptions at a height which may interfere with the flight path.

 

Sources: PVMBG, Magma Indonesia, VAAC Darwin

Home Reef - Sentinel image from 2022.10.20 / 23:59 p.m. - Doc. TGS

Home Reef - Sentinel image from 2022.10.20 / 23:59 p.m. - Doc. TGS

Some news from the Tonga Islands by the T.G.S.

At Home Reef, there has been no eruption in the last 5 days. The maritime and aviation codes are green.

The latest satellite image, taken on October 20, shows no morphological changes: the island is measured at 268 m. north-south and 283 m. east-west for an area of ​​about 15 acres and a height between 15 and 18 m. asl.

 

Source: TGS press release #38 of 22.10.2022

Hunga Tonga - photos T.G.S. 18.10.2022
Hunga Tonga - photos T.G.S. 18.10.2022

Hunga Tonga - photos T.G.S. 18.10.2022

Images from Hunga Tonga on October 18 show the island has sunk to 32m. above sea level. Erosion made him lose some 40 m. after the January 15, 2022 eruption.

Measurements made on October 14, 2022 of gaseous sulfur dioxide on the east side of the Tofua volcano - Doc. TGS 14.10.2022

Measurements made on October 14, 2022 of gaseous sulfur dioxide on the east side of the Tofua volcano - Doc. TGS 14.10.2022

Measurements made on October 14, 2022 of sulfur dioxide gas on the east side of the Tofua volcano were 9,000 ppm (parts per million).

This is an indication that the magma chamber is close to the surface. The measurement was taken under the volcanic gas plume drifting east from the cone of the Lofia volcano on Tofua Island.
There is no immediate danger, however, the public is advised to report any particular activity in the area.

 

Source: Tonga Geological Services

Grímsfjall (Grimstvötn) on the Vatnajökull glacier - 22.10.2022 photo Arni Gunnarsson
Grímsfjall (Grimstvötn) on the Vatnajökull glacier - 22.10.2022 photo Arni Gunnarsson

Grímsfjall (Grimstvötn) on the Vatnajökull glacier - 22.10.2022 photo Arni Gunnarsson

After a series of earthquakes and a jökulhlaup started on October 11 - link - tourists reported a large crack that opened in the middle of the road leading to Grímsfjall on the Vatnajökull glacier, between driving points A1 and A2. It is an abyss capable of swallowing up a car. The coordinates of the hole are: Latitude: 64° 24' 13.476" N - 17° 13' 57.282" W

In addition 4 other crevasses, much smaller, have opened up on the way.

 

Source: Andri Gunnarsson

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
Popocatépetl - exhalation at 09:41 on 21.10.2022 - Webcams deMexico / Cenapred

Popocatépetl - exhalation at 09:41 on 21.10.2022 - Webcams deMexico / Cenapred

During the last 24 hours, thanks to the monitoring systems of the Popocatépetl volcano, 62 exhalations have been detected, accompanied by water vapor, volcanic gases and slight amounts of ash. In addition, 251 minutes of tremor, 139 minutes of low amplitude and high frequency and 112 minutes of harmonic type were recorded. Two volcano-tectonic earthquakes were also recorded yesterday at 8:59 p.m. and today at 4:56 a.m. local time, with respective magnitudes of 1.5 and 2.1.

CENAPRED urges not to approach the volcano and especially the crater, because of the danger of falling ballistic fragments and, in the event of heavy rains, to stay away from the bottom of the ravines because of the danger of lava flows. mud and debris.

 

The alert level remains at Amarillo Fase 2

 

Sources : Cenapred & webcamsdeMexico

Merapi - weekly report 14 to 20.10.2022 - photo BPPTKG

Merapi - weekly report 14 to 20.10.2022 - photo BPPTKG

This week from October 14 to 20, 2022, five lava avalanches were observed towards the southwest at Merapi, dominant at S. Bebeng with a maximum slip distance of 1,800 m. The sound of the avalanches was heard from Babadan post 10 times with moderate intensity.

No significant morphological changes were observed from the southwest dome and the central dome. The volume of the dome is fixed, namely for the southwest lava dome of 1,626,000 m³ and the central dome of 2,772,000 m³.

During this week, the Mount Merapi earthquake was recorded 286 times deep volcanic earthquakes (VTA), 102 times multi-phase earthquakes (MP), 2 low frequency earthquakes (LF ), 411 abortion earthquakes (RF), 41 blowing earthquakes (DG), and 8 tectonic earthquakes (TT).
 

Merapi - seismicity and deformation as of 20.10.2022 - Doc.BPPTKG

 

Activity status is set at siaga level /3

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 southeastern sector covers the Woro River for a maximum of 3 km and the Gendol River for 5 km. Meanwhile, the ejection of volcanic material in the event of an explosive eruption can reach a radius of 3 km from the summit.

 

Source: BPPTKG

Taal - 2022.10.21 / 09:48 PST - phreatomagmatic burst - Phivolcs

Taal - 2022.10.21 / 09:48 PST - phreatomagmatic burst - Phivolcs

As announced yesterday, a total of nineteen (19) very weak phreatomagmatic bursts were detected by remote camera monitoring of Taal Main Crater between 8:50 a.m. and 1:30 p.m. today, October 21, 2022, all emanating from a vent on its northeast side.

The daily report from 21 to 22.10 / 05:00 mentions 29 for the day, as well as 2 volcanic earthquakes.

Some of these events produced steam-rich plumes 200 meters high, including a few emanating from very short black ash plumes that immediately collapsed into Main Crater Lake (MCL).

A voluminous plume 3,000 meters high is drifting WNW.

 

DOST-PHIVOLCS reminds the public that Alert Level 1 prevails over Taal Volcano, which means it is still in an abnormal state and should not be interpreted as having ceased unrest or ceased the threat of eruptive activity. .

 

Source: Dost-Phivolcs

Cotopaxi - emission of gas / steam on 21.10.2022 / 07:49 - photo IGEPN

Cotopaxi - emission of gas / steam on 21.10.2022 / 07:49 - photo IGEPN

The photo shows the Cotopaxi volcano cleared on the morning of October 21, 2022.

A westerly emission of gas is clearly observed, this type of emission dominated by water vapour; it is commonly observed since Cotopaxi ceased its eruptive activity at the end of 2015.

Seismicity, deformation and SO2 emission from the Cotopaxi volcano are at normal levels.

The gas column has a significant water content, due to the heavy rains that were recorded in the region during the week.

 

Photo: IG-EPN.

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