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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
 Sakurajima - explosion of  04.27.2020 / 10:47 p.m. - JMA webcam

Sakurajima - explosion of  04.27.2020 / 10:47 p.m. - JMA webcam

At Sakurajima, at the summit crater of Minamidake, nine eruptions occurred, including two explosions, according to the JMA on April 27. The plume rose up to 2500m above the edge of the crater before dispersing east.

The largest volcanic blocks reach the 6th station (800 to 1100 m from the Minamidake summit crater).

Inclinometers and extensometers installed on the island show the uplift and the expansion of the volcano.

 

Source: JMA / Fukuoka District Weather Observatory, Kagoshima Local Weather Observatory / info # 35.

Suwanosjima - 28.04.2020 / 04h16 - JMA webcam

Suwanosjima - 28.04.2020 / 04h16 - JMA webcam

In Suwanosjima, in the Ryukyu arc, an eruptive episode is reported on April 28 at 4:17 am; it was accompanied by a plume at 1,400 meters above the crater, with a flow towards the south-east.

The activity is in progress, and the alert levels unchanged.

 

Source: JMA

Sabancaya - summary of the activity between 20 and 26 April 2020 - Doc. I.G.Peru

Sabancaya - summary of the activity between 20 and 26 April 2020 - Doc. I.G.Peru

The Peruvian Geophysical Institute (IGP) reports that the eruptive activity of the Sabancaya volcano remains at moderate levels; that is to say with the continuous record of explosions with columns up to 2 km high above the summit of the volcano and the consequent emission of ash and gas. Consequently, for the following days, no significant change is expected regarding its activity.

Between 20 and 26 April 2020, the IGP recorded and analyzed the occurrence of around 297 earthquakes of volcanic origin, associated with the circulation of fluids (magma, gas, etc.) inside the volcano.

On average, 9 daily explosions of low to medium intensity were recorded. Plumes of gas and ash up to 2 km high above the summit of the volcano could be observed, scattered towards the southwest, south and southeast sectors of the Sabancaya.

Between April 21 and 25, major earthquakes were recorded in the Colca Valley region, with magnitudes between M3.2 and M4.1, associated with tectonic and volcanic activity; The epicenters of these earthquakes are located within a radius of 20 km around the crater of the volcano.

The monitoring of the deformation of the volcanic structure, using GNSS data (processed with fast orbits), does not present any significant anomalies; However, the presence of slight inflation in the area of ​​the northern Sabancaya volcano (near the Hualca Hualca volcano) has been observed.

Satellite surveillance has enabled the presence of 8 thermal anomalies with values ​​between 3 MW and 15 MW, associated with the presence of a body of lava (dome) on the surface of the crater of the volcano.

The volcanic alert level remains orange, with an exclusion zone of 12 km radius around the crater.

 

Source: I.G. Peru & Cenvul

 Anak Krakatau - 04.27.2020 - Sentinel-2 L1C image bands 12,11,4 - one click to enlarge

 Anak Krakatau - 04.27.2020 - Sentinel-2 L1C image bands 12,11,4 - one click to enlarge

The Anak Krakatau, on alert 2 / waspada, presented thermal anomalies between medium and low on April 26; visible on April 27 on a Sentinel-2 satellite image, it was not signaled by Mirova, due to cloud cover.

The PVMBG signals at the seismicity level for April 27 :

- 13 blast earthquakes, with an amplitude of 3-20 mm, and an earthquake duration of 6-28 seconds.

- 37 low frequency earthquakes with an amplitude of 2 to 9 mm and an earthquake duration of 3 to 10 seconds.

- 4 hybrid earthquakes with an amplitude of 7 to 9 mm, the S-P was not observed and the earthquake and for 5 to 10 seconds.

- 4 shallow volcanic earthquakes, with an amplitude of 2 to 6 mm, for 4 to 8 seconds.

- 4 episodes of continuous tremor with an amplitude of 0.5 to 6 mm, dominating 1 mm.

The public / tourists are not allowed to approach the crater within 2 km of the crater.

 

Sources: PVMBG, Magma Indonesia, Mirove and Sentinel-2

Stromboli - hot spots on the terrace and bluish plume of gas on 04.27.2020 - Sentinel-2 L1C image bands 12,11,4 - one click to enlarge

Stromboli - hot spots on the terrace and bluish plume of gas on 04.27.2020 - Sentinel-2 L1C image bands 12,11,4 - one click to enlarge

Bonus: a beautiful bluish plume of gas at Stromboli on 04.27.2020

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Publié le par Bernard Duyck
Publié dans : #volcanic activity, #Sismologia
 Klyuchevskoy - 04.26.2020 / 3:16 p.m. UTC - IVS FEB RAS KVERT 

 Klyuchevskoy - 04.26.2020 / 3:16 p.m. UTC - IVS FEB RAS KVERT 

The KVERT confirms continuous activity at the Klyuchevskoy on April 27, of Strombolian type, with a lava flow on the south-eastern flank of the volcano, the Apakhonchich chute, phreatic bursts and the slag collapse accompanying these emissions.

The plume is noted at 5,500-6,000 meters asl., extending over 424 km to the northwest of the volcano.

The aviation code remains orange.

 

Sources: KVERT & VAACTokyo

April 26, 2020, ~ Eruption/Lava Flow time lapse ~ Klyuchevskoy Volcano, Russia

Klyuchevskoy - Volcanic Ash Advisory for 27.04.2020 - Doc. VAAC Tokyo

Klyuchevskoy - Volcanic Ash Advisory for 27.04.2020 - Doc. VAAC Tokyo

During the night, from 03.51 h 26.04.2020, a seismic swarm took place in the area of ​​the Phlegraean Fields of the Solfatara-Pisciarelli, consisting of a sequence of 34 tremors of magnitude between 0.0 and 3.1 , and with hypocentres between 1 and 2 km. The earthquakes were felt in the Pozzuoli region.

The seismologists of the Vesuvius Observatory (Naples Section of the INGV), who analyzed the events, did not detect any anomalies regarding the current development of the current bradisismic crisis. It is recalled that the appearance of seismic swarms normally occurs during a period characterized by bradisismic activity, such as that underway in the Phlegrean Fields since 2005. There are elements of novelty in the progression of the current phenomenon . The geochemicals of the Vesuvius Observatory are at work to carry out surveys on the fumaroles of the Solfatara-Pisciarelli area, and report that there have been no new mouths opened.

 

Sources: INGVvulcani, INGV osservatorio Vesuviano, and Associazione Italiana di Vulcanologia (AIV)

Phlegraean fields - location of earthquakes of the last days and seismogram of 04.26.2020 - Doc. INGVvulcani and seismogram statio Solfatara south edge / radsalerno.altervista.org
Phlegraean fields - location of earthquakes of the last days and seismogram of 04.26.2020 - Doc. INGVvulcani and seismogram statio Solfatara south edge / radsalerno.altervista.org

Phlegraean fields - location of earthquakes of the last days and seismogram of 04.26.2020 - Doc. INGVvulcani and seismogram statio Solfatara south edge / radsalerno.altervista.org

A total of 18 people, including 13 guards and drivers from Virunga National Park in the Democratic Republic of the Congo were killed on Friday April 24 in an ambush by militiamen. It is the deadliest attack in recent years in this sensitive region of Upper Kivu.

We must remember the ambush of April 2014, in which Emmanuel de Merode, National Park curator, anthropologist and Belgian primatologist was seriously injured. Inaugurated in 1925, the park has since suffered repeated attacks by rebel groups, militiamen and poachers.

Virunga Volcanoes - image ESA Virunga Mountains / 2016.11.11

Virunga Volcanoes - image ESA Virunga Mountains / 2016.11.11

Respect to these rangers who protect mountain gorillas, and biodiversity, risking their lives, and condolences to the families of the victims of barbarism.

The park management declares that these tragic events will not stop the development programs carried out for the benefit of the neighboring communities, who aspire to live in an atmosphere of justice and peace.

 

Source: Virunga National Park - https://virunga.org/fr/news/updated-statement-from-virunga-national-park-on-recent-attack

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
Rincon de La Vieja - 04.24.2020 / 10.25 a.m. - photo Teresa Lopez / Ovsicori

Rincon de La Vieja - 04.24.2020 / 10.25 a.m. - photo Teresa Lopez / Ovsicori

The Rincon de La Vieja, in Costa Rica, after the phreatic episode of April 19, presented on the evening of April 20 and on April 21 several exhalations (puffs) of gas and low-energy vapor, the main one at 6:26 local time (link)

On April 22 at 5:35 am local time, a hydrothermal eruption was signaled by the Ovsicori, accompanied by projections and a gas plume reaching 1,500 meters. The activity lasted 1 minute and did not generate any lahar.

On April 24, small eruptions / exhalations were recorded at Rincon de La Vieja, respectively at 5:38 am, 6:40 am, 7:52 am and 10:20 am local. The stronger hydrothermal eruption at 10:20 is characterized by a column of water and solid materials reaching up to 300 meters above the edge of the crater and a plume of vapor up to a height of 1,000 meters. New lahars are reported.

 Rincon de La Vieja - black glassy fragments of less than 1 millimeter which are drops of solidified fresh magma - Via M.Martinez / Ovsicori

 Rincon de La Vieja - black glassy fragments of less than 1 millimeter which are drops of solidified fresh magma - Via M.Martinez / Ovsicori

Maria Martinez reports that the samples of sediment ejected during eruptions dated between April 15 and April 19 contained 20% glassy black fragments of less than 1 mm which would be fresh juvenile drops of magma.

                                                     *  *  *

During a maintenance visit of the measuring devices installed at the Irazu, the Ovsicori teams noted the disappearance of the lagoon from the main crater, as well as the material falling almost continuously from the unstable edge of the crater .

 

Source: Ovsicori-UNA

Popocatépetl - 24.04.2020 / 5h07 - Doc. Mexico's Webcams

Popocatépetl - 24.04.2020 / 5h07 - Doc. Mexico's Webcams

Over the past 24 hours, using the Popocatépetl surveillance system, 215 exhalations have been identified, accompanied by volcanic gases and sometimes ash, and two explosions, one moderate and one minor, were recorded today at 4:58 am and 5:07 am respectively.

In addition, 304 minutes of tremor were recorded.

An incandescence was observed during the night during certain exhalations.

At the time of this report, there is no visibility on the crater of the volcano, any emission will be dispersed in a northeast direction.

The Popocatépetl volcanic alert remains at amarillo Fase 2.

 

Source: Cenapred

 Popocatépetl - exhalation on 24.04.2020 / 07.10 am - Doc. Mexico's Webcams

 Popocatépetl - exhalation on 24.04.2020 / 07.10 am - Doc. Mexico's Webcams

 Popocatépetl - exhalation on 24.04.2020 / 07h56 - Doc. Mexico's Webcams

 Popocatépetl - exhalation on 24.04.2020 / 07h56 - Doc. Mexico's Webcams

Very small eruptions occur intermittently in the crater of Shindake, on Kuchinoerabujima.

This April 24 at 11:15 p.m., a plume is reported 300 meters above the crater. No volcanic block collapse or pyroclastic flow was observed.

A field study from April 21-23 revealed a crack on the west side of the Shindake crater, where a slight increase in temperature in the nearby geothermal field is reported.

JMA reports an increase in activity level this April 24.

 

Source / JMA
 

Kuchinoerabujima - summit crater of Shindake, seen from the east. note the cracks - Doc. archives Narod.ru

Kuchinoerabujima - summit crater of Shindake, seen from the east. note the cracks - Doc. archives Narod.ru

The KVERT reports a moderate explosive eruptive activity at the Ebeko, with the observation of an ash plume at 2,500-2,800 meters asl. drifting east for 5 km.

Aviation code stays orange

 

Sources: KVERT & VAAC Tokyo

 Ebeko - 04.25.2020 / 06.52 am - Severo-Kurilsk City / SVERT webcam

 Ebeko - 04.25.2020 / 06.52 am - Severo-Kurilsk City / SVERT webcam

The volcanic activity of Stromboli was characterized between 17 and 23 April by Strombolian explosions rich in pyroclastic material located mainly in the NE crater and continuous degassing in the C / SW crater. This activity is associated with a high to very high number of VLP earthquakes and acoustic pressures with variable values ​​between between medium and high (max 1.08 bar).

Stromboli - seismicity and infrasonic parameters between 17 and 23.04.2020 - Doc.LGS

Stromboli - seismicity and infrasonic parameters between 17 and 23.04.2020 - Doc.LGS

The degassing (puffing) activity, mainly located in the C / SW sector of the crater terrace, was maintained between medium and low values ​​(max 60 mbar).
The signal associated with the earthquake shows a stable trend on the average values.
The SO2 and CO2 fluxes measured during the last week show values ​​that range from medium to low; while the C / S ratio remains stable at low values.
MODIS satellite thermal anomalies detected low to moderate heat flux values ​​(maximum of 26 MW on April 19), in agreement with the explosive activity recorded by the other parameters.
Analysis of the seismic signals associated with landslide activities recorded during the past week has highlighted a series of material rolling events along the Sciara del Fuoco.

The seismic network at 15:02:19 h 22/04/2020 recorded a volcanic earthquake (VT) of magnitude 2.2. This event was also recorded on the average hydrophone from Punta Labronzo placed 14 m deep. The seismic event is probably located at a depth of 2.5 km inside the volcanic structure.

The global analysis of geophysical and geochemical parameters shows during the week a constant level of volcanic activity on average values.

 

Source: LGS

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Sakurajima - 04.24.2020 / 2:33 p.m. - Beginning of explosion and direction of the ash plume - Doc. JMA

Sakurajima - 04.24.2020 / 2:33 p.m. - Beginning of explosion and direction of the ash plume - Doc. JMA

At Sakurajima, an explosion took place on April 24 at 2:32 p.m. It was accompanied by a plume of ash and gas, the 155 ° of the year, rising to 2,100 meters above the Minamidake crater, with a dispersion towards the south-east.

The JMA reports a dispersion of large volcanic rocks towards the 6th station, 800-1.100 meters from the Minamidake crater.

 

Source: JMA

Merapi - the summit dome on 04.24.2020 / 12:42 p.m. loc. - photo Volcano YT

Merapi - the summit dome on 04.24.2020 / 12:42 p.m. loc. - photo Volcano YT

For the Merapi, on Java, the weekly report of the BPPTKG from April 17 to 23 indicates a currently stable dome.

The potential danger remains in the form of hot clouds from the collapse of the lava dome and bursts of volcanic material due to explosive eruptions. ⁣

 

The seismicity of April 23 is characterized by 2 avalanche earthquakes, 2 blast earthquakes and 8 hybrid earthquakes.

The latter remain present, although decreasing in number, over the past week.

Gas emissions are noted at a height of 50 meters above the summit.

The activity level remains at 2 / waspada, with a prohibited area of ​​3 km radius around the crater.

 

Source: BPPTKG

Merapi - activity from 23.04.2020 / 00h- 24h - Doc.BPPTKG

Merapi - activity from 23.04.2020 / 00h- 24h - Doc.BPPTKG

Activity of the past week at Mauna Loa, in volcanic alert level Advisory and aviaition code Yellow.

The volcano is not erupting.

Over the past week, HVO seismometers have recorded 78 small-scale earthquakes on the summit of the volcano and its elevation flanks. Most of these earthquakes occurred at shallow depths less than 8 km (~ 5 miles) below ground level. The largest earthquake was magnitude 2.3 under the southern caldera.

Global positioning system (GPS) measurements show continued slow top inflation, consistent with magma supply from the volcano's shallow storage system.

 

Mauna Loa - Deformation / summit tilt.  between 24.03 and 23.04.2020 - Doc. HVO / USGS


Gas concentrations at the Sulfur cone monitoring site in the southwest rift zone remain stable. The temperatures of the fumaroles measured both at the sulfur cone and at the top did not change significantly.

 

Source: Hawaii volcano Observatory / USGS

Villarica - summit crater - photo Franco Vera / Volcanologia in Chile - archives 27.03.2019

Villarica - summit crater - photo Franco Vera / Volcanologia in Chile - archives 27.03.2019

In Chile, the Villarica shows low energy seismic parameters. However, surface activity persisted, with minor explosions, and an oscillating level of the lava lake.

The technical alert level remains at Amarilla.

 

Source: Sernageomin

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Klyuchevskoy - photo 04.21.2020 Yu. Demyanchuk. IVS FEB RAS, KVERT

Klyuchevskoy - photo 04.21.2020 Yu. Demyanchuk. IVS FEB RAS, KVERT

In Kamchatka, the explosive - effusive Strombolian eruption continues at Klyuchevskoy, with ash explosions at 5,000-5,500 meters asl., and a lava flow in Apakhonchich chute on the southeast flank of the volcano. The ashes extend up to 70 km northeast of the Klyuchevskoy.

The aviation code remains orange, other explosions can occur at any time.

 

Soures: KVERT & VAACTokyo

Taal - photo Philippines Star 23.04.2020

Taal - photo Philippines Star 23.04.2020

In the past 24 hours, the Taal surveillance network in the Philippines has recorded thirty-nine (39) volcanic earthquakes, mainly associated with rock fracturing processes under and around the building.

Twenty-four of them were volcano-tectonic earthquakes in the municipality of Mabini and Balayan Bay. The largest of these events occurred yesterday at 11:06 a.m. and 11:19 a.m. and was recorded at magnitudes M4.5 and M4.6 and was felt at Intensity I respectively at Agoncillo and Lemery, in the province of Batangas, and Intensity III to Mabini and Bauan. , Intensity II in Taal and San Nicolas, and Intensity I in Agoncillo and Lemery, province of Batangas.

Low vapor emission or fumarolic activity was observed in the main crater vents and in the crack vents along the Daang Kastila trail.

Alert level 1 (abnormal) is maintained on the Taal volcano.

 

Source: Phivolcs

Anak Krakatau - 22.04.2020 - Sentinel-2 L1C image on 2020-04-22 SWIR - one click to enlarge

Anak Krakatau - 22.04.2020 - Sentinel-2 L1C image on 2020-04-22 SWIR - one click to enlarge

Anak Krakatau - thermal anomalies on 04.22.2020 - Sentinel-2 L1C image bands 12,11,4 - one click to enlarge

Anak Krakatau - thermal anomalies on 04.22.2020 - Sentinel-2 L1C image bands 12,11,4 - one click to enlarge

At Anak Krakatau, still in activity level 2 / waspada, after the change in eruptive activity from 10-11 BC, there are still several areas of thermal anomalies around the crater and at the lava flow , form a delta being cooled, according to the images of Sentinel-2 and the Mirova site.

The PVMBG reports for this April 22, a seismicity characterized by two blast earthquakes, 6 low frequency earthquakes and a continuous tremor of amplitude between 0.5 and 6 mm, with a dominant at 1 mm.

 

Sources: PVMBG, Sentinel Hub and Mirova

Anak Krakatau - Radiation power at 04.22.2020 / 7 a.m. - Doc. Mirova Modis

Anak Krakatau - Radiation power at 04.22.2020 / 7 a.m. - Doc. Mirova Modis

Some recent photos following an overflight on April 19 by the Japan Coast Guards of Nishinoshima, in the Ogasawara Islands, show a continuation of the activity of the volcano, without another comment unfortunately.

Source: Japan Coast Guards, via Shérine France

Nishinoshima - 19.04. 2020 /  15h16  -  fumeroles au cône et à l'entrée enmer d'une coulée de lave - photo Japan Coast Guards

Nishinoshima - 19.04. 2020 / 15h16 - fumeroles au cône et à l'entrée enmer d'une coulée de lave - photo Japan Coast Guards

Nishinoshima - 19.04. 2020 /  15h16  -  fumaroles to the cone and the entry of a lava flow in the sea f- photo Japan Coast Guards

Nishinoshima - 19.04. 2020 / 15h16 - fumaroles to the cone and the entry of a lava flow in the sea f- photo Japan Coast Guards

Nishinoshima - 19.04. 2020  - active crater - photo Japan Coast Guards

Nishinoshima - 19.04. 2020 - active crater - photo Japan Coast Guards

Nishinoshima - Pouvoir radiatif on 22.04.2020 - Doc. Mirova_MODIS_VRP

Nishinoshima - Pouvoir radiatif on 22.04.2020 - Doc. Mirova_MODIS_VRP

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Nevados de Chillan - 04.21.2020 / 1:33 p.m. loc. - Photo Sernageomin

Nevados de Chillan - 04.21.2020 / 1:33 p.m. loc. - Photo Sernageomin

This Tuesday, April 21 at 1:33 p.m. local time (5:33 p.m. UTC), the monitoring stations installed near the Nevados de Chillán Volcanic Complex recorded an explosion associated with fluid dynamics in the volcanic system with emission of gases and particles.

It was accompanied by a plume at 2380 meters above the emission point, moving in a south-easterly direction.

 

Source: Sernageomin

Dukono - 21.04.2020 / 6.10pm WIB- Doc. Magma Indonesia / PVMBG

Dukono - 21.04.2020 / 6.10pm WIB- Doc. Magma Indonesia / PVMBG

The Dukono, in the Moluccas archipelago, continues its activity. This April 21, a white-gray plume is observed 200-500 meters from the summit.

Magma Indonesia provides seismicity information:

- 2 eruption earthquakes, with an amplitude of 20-27 mm and a duration of 33-34 sec.

- A distant tectonic earthquake. And an episode of continuous tremor dominant at 2 mm.

The activity level remains at 2 / waspada, with a ban within a radius of 2 km around the crater Malupang Warirang. The aviation code remains orange.

 

Source: Magma Indonesia and VAAC Darwin.

Rincon de La Vieja - 04.21.2020 / 6:26 am local - gas and steam exhalation - photo Maurice Gutiérrez of Blue River Resort in Buenos Aires from Upala, via RSN

Rincon de La Vieja - 04.21.2020 / 6:26 am local - gas and steam exhalation - photo Maurice Gutiérrez of Blue River Resort in Buenos Aires from Upala, via RSN

The Rincon de La Vieja, in Costa Rica, after the phreatic episode of April 19, presented on the evening of April 20 and on April 21 several exhalations (puffs) of gas and low energy vapor, the main one at 6:26 local time on 21.04, with a white plume that rises 1000 meters above the height of the crater / 2916 meters above sea level. Duration of the activity: 30 seconds. The energy of the episode is 1.6x106 Joules.

 

Source: Ovsicori

Popocatépetl - 21.04.2020 / 08h33 - WebcamsdeMexico

Popocatépetl - 21.04.2020 / 08h33 - WebcamsdeMexico

At Popocatépetl, Cenapred has recorded, for the last 24 hours, 97 exhalations, of volcanic gases, sometimes accompanied by ashes.

Seismicity : 132 minutes of tremor observed.

An explosion occurred on April 21 at 9.45 p.m., accompanied by the expulsion of incandescent fragments and a plume 800 meters away.

Night glow is reported.

The alert remains at Amarillo Fase 2

 

Sources: Cenapred & webcamsdeMexico

Popocatépetl - 21.04.2020 / 9:45 p.m. - Doc. webcamsdeMexico

Popocatépetl - 21.04.2020 / 9:45 p.m. - Doc. webcamsdeMexico

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Fuego - lava flow on this satellite image bands 12,11,5 dated 19.04.2020 - Doc Insivumeh / Gobierno de Guatemala

Fuego - lava flow on this satellite image bands 12,11,5 dated 19.04.2020 - Doc Insivumeh / Gobierno de Guatemala

Insimumeh recorded on the night of April 18 on the seismic and acoustic network of Fuego a change in the type of activity. Climatic conditions made it impossible to visualize the lava flow, but analysis of satellite images helped to obtain its characteristics.

The flow to Barranca Ceniza on April 19 was approximately 320 meters long. The activity was accompanied by almost constant incandescence at the crater and avalanches over 1 km, reaching the level of vegetation.

It is reminded not to stay in the barrancas around the volcano, this activity can intensify.

Mirova recorded thermal anomalies between 19 and 185 MW from the 17th and the 20.04. It should be considered that the thermal anomalies can be masked or attenuated by the cloud cover.

 

Source: Gobierno de Guatemala, Insivumeh and Mirova

Fuego - thermal anomalies on 20.04.2020 / 07.45 am - Doc. Mirova_MODIS_logVRP

Fuego - thermal anomalies on 20.04.2020 / 07.45 am - Doc. Mirova_MODIS_logVRP

The Klyuchevskoy continues its eruptive activity, with ash plumes rising to 5,000 meters asl. approximately this April 20 and 21, and a lava flow which is maintained.

The aviation code remains orange.

 

Sources: KVERT and VAAC Tokyo

 Klyuchevskoy - 19.04.2020 - Sentinel-2, Enh image. nat. collar. + IR overlay, worked by P.Markuse / Twitter - one click to enlarge

Klyuchevskoy - 19.04.2020 - Sentinel-2, Enh image. nat. collar. + IR overlay, worked by P.Markuse / Twitter - one click to enlarge

Klyuchevskoy - thermal anomalies on 19.04.2020 / 01h50 - Doc. Mirova_MODIS_Latest10NTI

Klyuchevskoy - thermal anomalies on 19.04.2020 / 01h50 - Doc. Mirova_MODIS_Latest10NTI

Klyuchevskoy - Volcanic ash advisory for 20.04.2020 - Doc. VAAC Tokyo

Klyuchevskoy - Volcanic ash advisory for 20.04.2020 - Doc. VAAC Tokyo

 Klyuchevskoy - activity down slightly on 04.21.2020 at 6:51 am - IVS FEB RAS KVERT webcam

 Klyuchevskoy - activity down slightly on 04.21.2020 at 6:51 am - IVS FEB RAS KVERT webcam

Also delayed following the eruptive episode of Etna ...

In Costa Rica, a hydrothermal eruption occurred this April 19 at 10:14 am local to Rincon de La Vieja, and produced a vapor column at 1,500 meters above the crater. It lasted about a minute.

The expelled materials, solid and liquid, reached a height of about 300 meters above the crater, and produced a lahar on the north face, which did not affect the populations around the volcano.

The Ovsicori reports several small eruptions of the same type in the past hours (including one at 5.30 am), which however did not exceed the edge of the crater.

 

Sources: Ovsicori and Guanacaste conservation area

Rincon de La Vieja - eruptive plume and materials expelled on the flanks on 19.04.2020 - photo Área de Conservación Guanacaste / FB

Rincon de La Vieja - eruptive plume and materials expelled on the flanks on 19.04.2020 - photo Área de Conservación Guanacaste / FB

Images on the ground and from the sea support the satellite images (taken on April 17) of the morphological changes made to the Anak Krakatau during the eruption of April 10, 2020: disappearance of the crater lake, lava flow forming a delta at sea.

 

Source: authors of attached photos and videos.

Anak Krakatau - 17.04.2020 - lava flow and pyroclastic cone - photo via Tanguy de Saint-Cyr

Anak Krakatau - 17.04.2020 - lava flow and pyroclastic cone - photo via Tanguy de Saint-Cyr

Anak Krakatau - the volcano after the episode of lava fountain - Video Doni Janskulo

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Etna - summit activity of 19.04.2020 - photo Joseph Nasi / Butterfly Helicopters

Etna - summit activity of 19.04.2020 - photo Joseph Nasi / Butterfly Helicopters

The eruptive activity at the new southeast crater of Etna on April 19 began around 06:30 UTC local 8:30 am with a sudden increase in the tremor, showing strombolian activity at the "saddle cone" of the NSEC; from 07:15 h UTC, it gradually evolved into a pulsating lava fountain.

Etna NSEC - 19.04.2020, respectively at 7.15 am and 7.21 am - INGV OE webcams - one click to enlargeEtna NSEC - 19.04.2020, respectively at 7.15 am and 7.21 am - INGV OE webcams - one click to enlarge

Etna NSEC - 19.04.2020, respectively at 7.15 am and 7.21 am - INGV OE webcams - one click to enlarge

Etna - tremor curve at 19.04.2020 - Doc. INGV OE

Etna - tremor curve at 19.04.2020 - Doc. INGV OE

From 07:50 UTC, modest lava flows are observed at the top of the NSEC and remain confined to the upper eastern and southern flanks of the cone.

Etna - lava overflow - 19.04.2020 / 09h42 - INGV webcam Emot0194 - One click to enlargeEtna - lava overflow - 19.04.2020 / 09h42 - INGV webcam Emot0194 - One click to enlarge

Etna - lava overflow - 19.04.2020 / 09h42 - INGV webcam Emot0194 - One click to enlarge

The activity generated the emission of an ash plume which was quite weak at the beginning and which gradually increased in intensity from 08:45 UTC, reaching around 5,000 meters in height. The ashes fell on the eastern side of the volcano for the most part in the Bove Valley and fallout of fine materials were also reported on the city of Zafferana.

The aviation code changed from orange to red at 7:24 am UTC.

Etna - evolution of the ash plume, on April 19, 2020 respectively at 9:45 am and 10:58 am - Skyline and LAVE webcam - one click to enlargeEtna - evolution of the ash plume, on April 19, 2020 respectively at 9:45 am and 10:58 am - Skyline and LAVE webcam - one click to enlarge

Etna - evolution of the ash plume, on April 19, 2020 respectively at 9:45 am and 10:58 am - Skyline and LAVE webcam - one click to enlarge

Etna seen from Tremestieri Etneo - 19.04.2020 - photo Boris Behncke

Etna seen from Tremestieri Etneo - 19.04.2020 - photo Boris Behncke

Etna - 19.04.2020 - NSEC overview on 19..04.2020 - photo Joseph Nasi / Butterfly helicopters

Etna - 19.04.2020 - NSEC overview on 19..04.2020 - photo Joseph Nasi / Butterfly helicopters

From 09:55 UTC, the lava fountain activity gradually diminished until it stopped.

Finally, it is reported that strombolian activity at the crater of La Voragine, which started in September 2019. continues with slight fluctuations compared to what has been communicated so far.

From a seismic point of view, after a significant drop in the tremor, the eruptive episode was announced by a rapid increase in the volcanic tremor from 5.40 hours GMT - 7.40 local hours, which reached the highest energy level at 7.00 hours GMT (9.00 local time). The sources of the signal are located in the area of ​​the New Southeast Crater at shallow depth.

The episode was accompanied by remarkable infrasound activity, which is also decreasing.

The INGV announces at 23:55 (21:55 UTC), the return of parameters to normal activity.

 

Sources: INGV OE - Boris Behncke and Joseph Nasi / Butterfly helicopters

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
  Klyuchevskoy - 18.04.2020 / 9h27 - a lava flow begins to move on the south-eastern flank of the volcano - KVERT webcam

 Klyuchevskoy - 18.04.2020 / 9h27 - a lava flow begins to move on the south-eastern flank of the volcano - KVERT webcam

A moderate Strombolian activity is reported at the Klyuchevskoy this April 18, characterized on the one hand, by a lava flow on the south-eastern flank, and on the other hand, by an emission of a plume of gas and vapor, containing a little ash , at 5,000-5,500 meters asl., extending for about 100 km towards the northeast, then the ENE.

The thermal anomalies recorded by Mirova on the 18th range between 15 MW and 1580 MW; for April 19, we note a slight decrease, with between 41 MW and 550 MW.

Aviation code stays orange

 

Source: KVERT

Klyuchevskoy - thermal anomalies on 19.04.2020 / 01h50 - Doc.Mirova_MODIS_Latest10NTI

Klyuchevskoy - thermal anomalies on 19.04.2020 / 01h50 - Doc.Mirova_MODIS_Latest10NTI

Also in Kamchatka, Karymsky activity has been gradually increasing since April 6, 2020, when a small thermal anomaly was detected.

On April 18, KVERT reports continuous degassing.

The aviation code is Yellow, due to the possibility of ash explosions that can affect low altitude flights.

 

Source: KVERT

Karymsky - photo archive Dmitry Melnikov 15.08.2019

Karymsky - photo archive Dmitry Melnikov 15.08.2019

The activity of Dukono, in level 2 / waspada on Halmahera, continues with this April 18 a thick white-gray plume 200-600 meters above the summit.

The PVMBG informs for this day:

- 2 eruption earthquakes, with an amplitude of 20-24 mm and a duration of 32.3 - 44.4 sec.

-  continuous tremor of dominant amplitude at 2 mm.

The level of activity remains unchanged, with a ban on access within a radius of 2 km around the crater Malupang Warirang

 

Sources: PVMBG, Magma Indonesia and VAAC Darwin

 Dukono - plume of April 18, 2020/6 p.m. - Doc. Magma Indonesia

 Dukono - plume of April 18, 2020/6 p.m. - Doc. Magma Indonesia

In Costa Rica, the Ovsicori mentions in recent days a degassing at the level of the acid lake and mouths A and B of Poas.

No eruption is reported, and seismicity is characterized by a continuous and weak tremor between 1 and 2 Hz. The concentration of sulfur dioxide shows an increase, at 5.18 ppm.

The maximum SO2 concentrations at the watchtower are between 1 and 5 ppm.

 

A table recalls the activity levels of the country's volcanoes.

 

Source: Ovsicori

 2195/5000 Poas - degassing on 04.16.2020 / 10.56 am - Ovsicori webcam

2195/5000 Poas - degassing on 04.16.2020 / 10.56 am - Ovsicori webcam

Poas - degassing on 18.04.2020 / 06h56 - Ovsicori webcam

Poas - degassing on 18.04.2020 / 06h56 - Ovsicori webcam

Table of activity of the volcanoes of Costa Rica on 13.04.2020 - Doc. Ovsicori

Table of activity of the volcanoes of Costa Rica on 13.04.2020 - Doc. Ovsicori

At Piton de La Fournaise, after the last eruption from April 2 to 6, inflation is recorded in the summit area and in the far field, evidence of the pressurization of a surface source and a deep source.

CO2 emissions from the soil are increasing in the distal zone, at the Plaine des Cafres, and in the proximal zone, at the Gite du volcan.

 

It should be noted that Pélé's hair continues to fall 10 days after the end of the eruption, remobilized by the wind. The OVPF documents the evolution over time, the dispersion and the alteration of this glassy dust.

Source: OVPF

Piton de La Fournaise - Illustration of the deformation over 2 months, between 19.02 and 19.04.2020. Here are represented baselines (variation of distance between two GPS receivers) crossing the building of Piton de la Fournaise, at the top (top), at the base of the terminal cone (in the middle) and in the far field (bottom ) (see location on associated maps). An increase is synonymous with elongation and therefore swelling of the volcano; conversely, a decrease is synonymous with contraction and therefore deflation of the volcano. Any periods colored in light pink corresponding to the eruptions. - Doc. OVPF

Piton de La Fournaise - Illustration of the deformation over 2 months, between 19.02 and 19.04.2020. Here are represented baselines (variation of distance between two GPS receivers) crossing the building of Piton de la Fournaise, at the top (top), at the base of the terminal cone (in the middle) and in the far field (bottom ) (see location on associated maps). An increase is synonymous with elongation and therefore swelling of the volcano; conversely, a decrease is synonymous with contraction and therefore deflation of the volcano. Any periods colored in light pink corresponding to the eruptions. - Doc. OVPF

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
Etna - 04.17.2020 - La Bocca Nuova was filled with lava from the Voragine crater. In addition, a new pit has formed in the central part of the Bocca Nuova. - Photos of Francesco Ciancitto, INGV-Osservatorio Etneo.
Etna - 04.17.2020 - La Bocca Nuova was filled with lava from the Voragine crater. In addition, a new pit has formed in the central part of the Bocca Nuova. - Photos of Francesco Ciancitto, INGV-Osservatorio Etneo.

Etna - 04.17.2020 - La Bocca Nuova was filled with lava from the Voragine crater. In addition, a new pit has formed in the central part of the Bocca Nuova. - Photos of Francesco Ciancitto, INGV-Osservatorio Etneo.

The National Institute of Geophysics and Volcanology, Etnean Observatory, communicates that from 20.50 hours UTC on April 17, we observe at Etna a sudden increase in the magnitude of the volcanic tremor which reached the maximum value at 21.26 hours UTC, attesting to high values.

This activity was accompanied by a moderate increase in infrasound activity, which is localized in the area of ​​the SEC / NSEC craters.

In addition, from the network of surveillance cameras, it is possible to observe, with regard to the "saddle cone" of the New Crater of Southeast, gleams attributable to an intracrateric strombolian activity, associated with an accentuation of the thermal anomaly that has long characterized the same area.

Strombolian activity at La Voragine crater, which began in September 2019, continues with small fluctuations; The lava emitted by the cone complex of Voragine filled the crater of Bocca Nuova, where a new pit crater / collapse well is present in the central part.

 

Source: INGVvulcani

 Etna - tremor diagram on 04/17/2020 - Doc INGV OE

Etna - tremor diagram on 04/17/2020 - Doc INGV OE

 Etna - hot spots at the summit craters - Sentinel-2 L1C image 17.04. 2020 bands 12,11,8A - one click to enlarge

 Etna - hot spots at the summit craters - Sentinel-2 L1C image 17.04. 2020 bands 12,11,8A - one click to enlarge

At the Anak Krakatau, the clear sky above the volcano allowed the Sentinel-2 satellite to acquire a first clear image since the eruption of April 11, 2020, confirming the changes sketched on a radar image of Sentinel-1.

It shows, in addition to the hot spots, a new morphology of the crater area : the pre-existing crater lakes appear to have been partially filled by a lava flow and / or other deposits; and a lava delta, still warm, protrudes on the west coast of the island.

Anak Krakatau - cloudless - Sentinel-2 L1C image Copernicus / ESA from 17.04.2020 - one click to enlarge
Anak Krakatau - cloudless - Sentinel-2 L1C image Copernicus / ESA from 17.04.2020 - one click to enlarge

Anak Krakatau - cloudless - Sentinel-2 L1C image Copernicus / ESA from 17.04.2020 - one click to enlarge

Anak Krakatau - Sentinel-1 radar image from 15.04.2020 - Copernicus / Esa, via Simon Carn

Anak Krakatau - Sentinel-1 radar image from 15.04.2020 - Copernicus / Esa, via Simon Carn

 Anak Krakatau - Sentinel-2 L1C image dated 17.04. 2020 bands 12,11,8A - one click to enlarge

 Anak Krakatau - Sentinel-2 L1C image dated 17.04. 2020 bands 12,11,8A - one click to enlarge

The PVMBG reports the seismicity level for this April 17:

- two eruption earthquakes, including one at 5:32 pm WIB, recorded on the seismogram with a maximum amplitude of 40 mm and a duration of 27 seconds.

- two blast earthquakes

- eight low frequency earthquakes, and one shallow volcanic earthquake.

- and four episodes of micro-tremor of dominant amplitude at 0.5mm.

 

A thin white plume rises 50-100 meters above the summit.

The activity level remains at 2 / waspada, with an unauthorized area of ​​2 km radius around the crater. The VONA is orange.

 

Sources: PVMBG, Magma Indonesia and Sentinel / ESA

Merapi - activity report from 10 to 16 April 2020 - Doc. BPPTKG
Merapi - activity report from 10 to 16 April 2020 - Doc. BPPTKG

Merapi - activity report from 10 to 16 April 2020 - Doc. BPPTKG

In Merapi, on Java, on April 10, 2020 at 9:10 a.m.WIB, an eruption occurred with an eruptive plume reaching 3,000 m. The eruption was recorded on a seismogram with an amplitude of 75 mm and a duration of 103 seconds.

Morphological analysis of the crater area based on photos of the southeast sector showed no change in the morphology of the dome. The volume of the lava dome based on measurements using aerial photos with drones on February 19, 2020 was 291,000 m³.

During this week, the seismicity this week is higher than last week.

 

Based on the results of the visual and instrumental observations, the PVMBG concludes that:

- The lava dome is currently in a stable state.

- The volcanic activity of Mount Merapi is still quite high and is determined by the level of activity "BE AWAY".

- The current potential danger comes in the form of a pyroclastic flow from the collapse of the lava dome and an explosion of volcanic material from explosive eruptions.

 

Source: BPPTKG

Merapi - the summit 13.04.2020 / 5:49 am - photo BPBD

Merapi - the summit 13.04.2020 / 5:49 am - photo BPBD

Merapi - 13.04.2020 - Sentinel-2 L1C image bands 12,11,4 - one click to enlarge

Merapi - 13.04.2020 - Sentinel-2 L1C image bands 12,11,4 - one click to enlarge

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