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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
Etna NSEC - Strombolian activity of 07.12.2019 / 22:10 of the Mareneve road near the village of Fornazzo on the eastern flank of Etna - photo INGVvulcani

Etna NSEC - Strombolian activity of 07.12.2019 / 22:10 of the Mareneve road near the village of Fornazzo on the eastern flank of Etna - photo INGVvulcani

From 18:00 UTC on 6 December, the cameras of the CCTV system of the INGV show, in addition to the Voragine / Bocca Nuova activity, a gradual intensification of Strombolian activity at the New Crater of South-East of the Etna, who manifested already from 16:00 UTC with weak and discontinuous explosions. The activity produces, for the moment, the fallout of incandescent material along the slope of the cone. An increase in the tremor is observed around 22:10 local.

Etna NSEC- 07.12.2019 / 19:27 - INGV webcam Emov0389


This activity continued on December 7, marked by thermal anomalies between 71 and 169 MW, according to Mirova.

December 8, values ​​of 54 and 144 MW are recorded at 0:15 and 1:50. This morning, ashes are emitted by the crater northeast.

 

Sources: INGV OE, INGVvulcani and local observers.

Etna tremor - at 08.12.2019 / 4:10 - Doc. INGV EMFS velocimeter - HHZ - RMS

Etna tremor - at 08.12.2019 / 4:10 - Doc. INGV EMFS velocimeter - HHZ - RMS

Etna - thremical anomalies at 08.12.2019 / 01h50 - Doc. Mirova_MODIS_Latest10NTI

Etna - thremical anomalies at 08.12.2019 / 01h50 - Doc. Mirova_MODIS_Latest10NTI

In the Aleutian arc, an eruption was detected on December 7th in Semisopochnoi, starting at 0h26 AKST, with an episode of strong tremor and the emission of infrasound.

Cloud cover around 3,000 meters prevented the detection of an ash plume of greater height.

The aviation code and the alert level were increased respectively at Orange & Watch.

Intermittent explosions continued during the night, and seismicity remains high.

No surface activity or significant ash emissions were observed.

 

Source: AVO

Semisopochnoi - photo archives AVO /  Clifford Roger

Semisopochnoi - photo archives AVO / Clifford Roger

A moderate eruptive activity continues in Ebeko, in the northern Kuriles. It is characterized by explosions generating a plume of ashes high of 2500-2700 meters asl, drifting towards the northeast of the volcano.

The continuation of the activity justifies the maintenance of the orange aviation code, explosions accompanied by ashes that can occur at any moment and reach up to 6000 meters asl.

 

Sources: KVERT & VAAC Tokyo

Ebeko - Videodata by IMGG RAS FEB and KB GS RAS 27.07.2019

Ebeko - Videodata by IMGG RAS FEB and KB GS RAS 27.07.2019

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
Etna - situation of the VOR & BN on 06.12.2019 - photo Piero Berti, via J.Nasi / Butterfly Helicopters / INGVvulcani

Etna - situation of the VOR & BN on 06.12.2019 - photo Piero Berti, via J.Nasi / Butterfly Helicopters / INGVvulcani

Etna - situation of the VOR & BN on 06.12.2019 - photo Piero Berti, via J.Nasi / Butterfly Helicopters / INGVvulcani

Etna - situation of the VOR & BN on 06.12.2019 - photo Piero Berti, via J.Nasi / Butterfly Helicopters / INGVvulcani

At Etna, since the 6th of December in the morning, a Strombolian activity marks the Voragine and a new lava flow is observed from the base of the cone of slag located in this crater; lava waterfall in the Bocca Nuova. INGV reports that this phenomenon has already been observed on 18-20 September2019.

An explosion is recorded by the thermal camera at the eastern mouth of the new southeastern crater / NSEC.

 Etna - Hot spots at crater NE, Bocca Nuova and Voragine; low spot at NSEC - Sentinel-2 L1C image on 2019-12-04 bands 12,11,4

 Etna - Hot spots at crater NE, Bocca Nuova and Voragine; low spot at NSEC - Sentinel-2 L1C image on 2019-12-04 bands 12,11,4

Etna NSEC - 06.12.2019 / 09:28 - Etna Webcam therm EMOT - INGV OE

Etna NSEC - 06.12.2019 / 09:28 - Etna Webcam therm EMOT - INGV OE

From 18:00 UTC, CCTV cameras show a gradual intensification of strombolian activity at the New Southeast Crater, which has already manifested itself since 16:00 UTC with weak and discontinuous explosions. The activity produces, for the moment, the fallout of incandescent material along the slope of the cone.

An increase in the tremor is observed around 22:10 local.

 

Sources: INGV vulcani and Piero Berti photos (aka Joseph Nasi), Butterfly Helicopters s.r.l.

Etna - Strombolian activity 06.12.2019 / 19h34 at NSEC (right) and weaker explosions at Voragine (left) - photo INGVvulcani

Etna - Strombolian activity 06.12.2019 / 19h34 at NSEC (right) and weaker explosions at Voragine (left) - photo INGVvulcani

Etna - thermal anomalies on 07.12.2019 / 01h10 - Doc. Mirova Modis

Etna - thermal anomalies on 07.12.2019 / 01h10 - Doc. Mirova Modis

 Etna - tremor at 07.12.2019 - Doc. INGV OE

Etna - tremor at 07.12.2019 - Doc. INGV OE

In the Izu-Bonain Volcanic Arc, the Nishinoshima Volcano, which has been calm since July 2018, has recovered explosive-effusive activity since 4 December 2019.

The explosions are located at the main cone, and a vent that opened at the NE base of the cone produces spaterring and lava flows.

This activity, in addition to the thermal anomalies recorded by satellite, was observed on December 6 during an overflight by the Japanese coastguard.

 

Sources: Japan Coast Guards, JMA and Mirova

Nishinoshima - 06.12.2019 - photo Japan Coast Guards

Nishinoshima - 06.12.2019 - photo Japan Coast Guards

Nishinoshima - 06.12.2019 - photo Japan Coast Guards

Nishinoshima - 06.12.2019 - photo Japan Coast Guards

In Indonesia, the Karangetang South Crater shows sustained activity, with incandescent projections at 50 m height. The lava descends towards Kali Batang and West Beha until about 800 - 1000 m, until Kali Sense, Nanitu, Sesepe and Pangi, until about 1000 - 1500 m.

Le cratère nord est lui aussi actif et présente de l'incandescence.

Karangetang - image Sentinel-2 bands 12,11,4 from 05.12.2019

Karangetang - image Sentinel-2 bands 12,11,4 from 05.12.2019

 Karangetang - Thermal anomalies at 07.12.2019 / 5.25 - Doc. Mirova_MODIS_Latest10NTI

 Karangetang - Thermal anomalies at 07.12.2019 / 5.25 - Doc. Mirova_MODIS_Latest10NTI

Le PVMBG renseigne pour ce 5 décembre :

87 séismes d’avalanches
13 séismes liés aux explosions .
2  séismes Hybride
10 tremblements de terre volcaniques peu profonds
1 tremblement de terre volcanique
1 séisme ressenti (échelle 1 MMI)
5 grands séismes tectoniques
2 épisode de trémor harmoniques
et du Tremor continu, d'amplitude 0,5-7 mm (valeur dominante 5 mm).

 

Sources : PVMBG, Mirova et Sentinel-2

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
Nyiragongo - early December 2019 activity - photo Kampala Walking Tour via Ludovic Leduc

Nyiragongo - early December 2019 activity - photo Kampala Walking Tour via Ludovic Leduc

At the Nyiragongo, the vent opened in March 2016 on the upper terrace surrounding the lava lake found a nice activity in early December, with fountaining and intracratory flows (photos and video following this link / Georgios Grigoriadis / Shérine France )

As reported by the volcanologist Ludovic Leduc, the major risk is the pressure made by all this lava on the flanks of the volcano, which could crack and let escape lava flows as in 2002.

 

Sources: Mirova, on-site observers via Shérine France, Kampla walking tour, comments by Ludovic Leduc.

Nyiragongo - thermal anomalies 2-3.12.2019 - Doc. Mirova 05.12.2019

Nyiragongo - thermal anomalies 2-3.12.2019 - Doc. Mirova 05.12.2019

In Chile, Nevados de Chillan reported an explosion on December 5 at 11:32 local time (UTC -3h), associated with an LP seismic signal, and a plume of ash and gas at a height of about 1,600 meters.

On the other hand, among the earthquakes of the day, we point the most energetic at4.5 km to the ESE of the active crater and a depth of 3,400 meters.

Inflation continues to be recorded, as well as thermal anomalies: 7MW on 05.12 and 19 Mw on 06.12 / 4.05.

Nicanor Crater has four emission centers, acting independently or simultaneously. Their activity is associated with pyroclastic flows, 1,100 meters long towards East and 400 meters towards South.

Lava flows, from L1 to L4, observed previously, show no further progress.

The technical alert is maintained in Naranja

 

Source: Sernageomin OVDAS

Nevados of Chillan - eruptive pulse of 05.12.2019 / 11h33 loc. - Cámara OVDAS, Sernageomin

Nevados of Chillan - eruptive pulse of 05.12.2019 / 11h33 loc. - Cámara OVDAS, Sernageomin

In the Aleutian arc, the thermal anomalies recorded on December 5 at Shishaldin are consistent with an ongoing lava effusion. The continuous tremor is also rising.

Small emissions of steam and a little ash are observable by the webcam on the summit and the north flank.

The volcanic alert remains at Watch and the aviation code is orange.

 

Source: AVO

Shishaldin - lava flow this 01.12.2019 - Sentinel-2 L1C image bands 12,11,4 - one click to enlarge

Shishaldin - lava flow this 01.12.2019 - Sentinel-2 L1C image bands 12,11,4 - one click to enlarge

Shishaldin - thermal anomalies of 05.12.2019 - Doc. Mirova 06.12.2019

Shishaldin - thermal anomalies of 05.12.2019 - Doc. Mirova 06.12.2019

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Publié le par Bernard Duyck
Publié dans : #volcanic activity

In the Aleutian arc, the AVO recorded in Shishaldin on December 4 afternoon and evening high surface temperatures, related to an effusion of lava, confirmed by an increase in seismicity.

Shishaldin - RSAM 04.12.2019 - Doc. AVO


A lava flow on the flank of the volcano was observed by a pilot; no ashes were emitted.

The volcanic alert remains at Watch, with an orange aviation code

 

Source: AVO

Shishaldin - thermal anomalies of 04.12.2019 - Doc. Mirova 05.12.2019

Shishaldin - thermal anomalies of 04.12.2019 - Doc. Mirova 05.12.2019

In Papua New Guinea, small thermal anomalies are reported by Mirova on December 5, 2019.

Sentinel - 2 SWIR images from 1 December show gas (bluish) and vapor plumes to the southwest and the main island.

For Manam, the low anomalies are between 1 and 9 MW.

Papua New Guinea - image Sentinel2 SWIR from 01.12.2019 emissions from volcanoes Kadovar (center) and Mamanm (bottom right) - One click to enlarge

Papua New Guinea - image Sentinel2 SWIR from 01.12.2019 emissions from volcanoes Kadovar (center) and Mamanm (bottom right) - One click to enlarge

Manam - thermal anomalies on 05.12.2019 / 4h - Doc.Mirova _MODIS_Latest10NTI

Manam - thermal anomalies on 05.12.2019 / 4h - Doc.Mirova _MODIS_Latest10NTI

 Manam - Sentinel-2 image SWIR 01.12.2019 - One click to enlarge

Manam - Sentinel-2 image SWIR 01.12.2019 - One click to enlarge

For Kadovar, an anomaly of 5 MW is reported today.

 

Sources: Mirova and Sentinel-2

Kadovar summit in mid-October - photo the field ecologist / Facebook
Kadovar summit in mid-October - photo the field ecologist / Facebook

Kadovar summit in mid-October - photo the field ecologist / Facebook

The Sangay, in Ecuador, continues its current eruptive phase that began on May 7, 2019 (a total of 212 days).

With seismic and acoustic monitoring, it is evident that the internal activity is dominated by signals of fluid movements and explosions. A small deformation of the volcano has been observed during the last month, probably due to the entry of new deep magmas.

On the surface, a semi-continuous activity is maintained from two eruptive centers: the central crater and the Ñuñurco vent (southeast).

The central crater has explosive activity that generates small clouds of gas and ash. During the last month, emissions reached 2 km above the crater and are mostly dispersed to the northeast with high variability, causing small ash falls in the provinces of Chimborazo, Morona Santiago and Azuay.

On the other hand, the Ñuñurco vent has an effusive activity that results in an almost continuous emission of lava flows that are deposited along the southeast flank of the Sangay. At the edge of the lava flows, small rock falls (pyroclastic flows) reach the basin and the upper channel of the Volcán River. These deposits cause small temporary dams in the Volcán, which are remobilized by precipitation, forming mudslides and debris (lahars).

 

Source: IGEPN

Multiparametric map of Sangay volcano activity from May to 1 December 2019. a: seismic activity (number of events per day) detected at PUYO station (source: IG-EPN); b: SO2 emissions (tonnes per day) detected by the Sentinel-5P satellite sensor (source: MOUNTS); c: height of ash plumes (m above crater level) detected by GOES-16 satellite sensor (source: Washington VAAC); d: thermal emission power (megawatt) detected by the MODIS satellite sensor (source: MODVOLC) and estimated accumulated lava volume (million m3, the dotted lines represent the error range).

Multiparametric map of Sangay volcano activity from May to 1 December 2019. a: seismic activity (number of events per day) detected at PUYO station (source: IG-EPN); b: SO2 emissions (tonnes per day) detected by the Sentinel-5P satellite sensor (source: MOUNTS); c: height of ash plumes (m above crater level) detected by GOES-16 satellite sensor (source: Washington VAAC); d: thermal emission power (megawatt) detected by the MODIS satellite sensor (source: MODVOLC) and estimated accumulated lava volume (million m3, the dotted lines represent the error range).

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
 Bathymetry of the submarine volcano of Mayotte and its flows - Doc SHOM 07.2019 - one click to enlarge

Bathymetry of the submarine volcano of Mayotte and its flows - Doc SHOM 07.2019 - one click to enlarge

According to REVOSIMA bulletin # 9 - 16 at 30.11.2019 - the new underwater eruption site in Mayotte has produced at least 5.1 km3 of lava since the beginning of its construction.

Over a period of 11 months (July 2018 - beginning of surface deformations recorded in Mayotte - June 2019), the eruptive lava flow is about 150-200 m3 / s.

Since the discovery of the volcanic edifice, three new remote exit points have been identified that have produced:

- in the south about 0.2 km3 of lava in 28 days (18 May-17 June 2019) for an average minimum flow of about 83 m3 / s;

- in the west, about 0.3 km3 of lava in 44 days (between June 17 and July 30, 2019) for an average minimum flow of 79 m3 / s;

- north about 0.08 km3 of lava in 20 days (between July 31 and August 20, 2019) for an average minimum flow of about 44 m3 / s.

These eruptive flows remain high. These eruptive volumes and flows, especially at the beginning of the crisis, are exceptional and, given the uncertainties, are generally the highest observed on an effusive volcano since the eruption of Laki (Iceland) in 1783 whose average eruptive flow had been estimated at 694 m3 / s over 245 days of eruption.

Mayotte: Soil movements recorded on Mayotte GPS stations during the last 3 months from 1-09-2019 to 30-11-2019. The horizontal displacements are represented in vectorial form and the vertical displacements are indicated by the numerical values ​​in color. Post-processing of this data by IPGP (© OVPF-IPGP / REVOSIMA).

Mayotte: Soil movements recorded on Mayotte GPS stations during the last 3 months from 1-09-2019 to 30-11-2019. The horizontal displacements are represented in vectorial form and the vertical displacements are indicated by the numerical values ​​in color. Post-processing of this data by IPGP (© OVPF-IPGP / REVOSIMA).

Since August 2019, the vectors of horizontal displacements point more towards the north, resulting in a relative displacement of the simple isotropic pressure source, which can explain these displacements, about 20-25 km more to the north-west compared to beginning of the year.

Several hypotheses are formulated:

Thus, for the last 3 months, the best single model (one-source model, isotropic and elastic medium) that can account for these displacements would be a source of localized deflation between 26 and 73 km east of Mayotte and at a depth between 45 and 75 km at 95% probability. Over the last fifteen days the flows associated with the best models would be between -30 to -80 m3 / s. Note that in the case of a source in deflation, the evolutions of position of the source towards more superficial depths do not translate a source migration but could be linked to the effect of the closure of a conduit (being gradually from the bottom up).

More complex models, under evaluation, suggest that several sources of pressure (in deflation and inflation), geometry and variable volume, located at different depths, could also explain the deformations observed over different periods of time.

Nevertheless, the dominant source remains a source of deflation. Whatever the models, these deformations confirm that transfers of magmatic fluids are still continuing in depth, and that in the current state of the art these fluids seem to circulate between 20 and 60 km deep without being able to elaborate. more refined scenarios on the future evolution of this activity.

 

Source: BRGM / REVOSIMA - https://brgm.fr/content/volcan-seismes-mayotte-suivi-activite-sismo-volcanique-revosima

Mt Michael - hot spots on the Mawson peak on 02.12.2019 - Sentinel-2A L1C - customscript / Annamaria Luongo / Copernicus - one click to enlarge

Mt Michael - hot spots on the Mawson peak on 02.12.2019 - Sentinel-2A L1C - customscript / Annamaria Luongo / Copernicus - one click to enlarge

A beautiful image of Mt.Michael on Saunders Island / South Sandwich was put online by Annamaria Luongo, detailing three hot spots to Mawson Peak on December 2, 2019.

The last periodic observations of this retracted volcano (GVP) by satellite, between January and July, show volcanic plumes. The last thermal anomaly dates from April 3, 2018.

 

Sources: Annamaria Luongo / Sentinel-2A - Mirova - Global Volcanism Program.

 Sakurajima - image Sentinel-2 L1C bands 12,11,4 from 03.12.2019

 Sakurajima - image Sentinel-2 L1C bands 12,11,4 from 03.12.2019

 Sakurajima - zoom in the image Sentinel-2 L1C bands 12,11,4 from 03.12.2019

 Sakurajima - zoom in the image Sentinel-2 L1C bands 12,11,4 from 03.12.2019

On March 3 at 5:59 pm, an eruption occurred at Sakurajima (crater atop Mount Minamidake) and reached 2300 m above the edge of the crater.

Volcanic ash disperses to the south and affects Ibusuki and Kagoshima. A fall of Tephra is planned in the city of Tarumi, in the prefecture of Kagoshima.

Ashes are expected before 00:00 on 04 in the following municipalities:.

Miyazaki Prefecture: Miyakonojo City, Nichinan City, Kushima City

Kagoshima Prefecture: Kagoshima City, Kanoya City, Tarumi Town, Suo Town, Shibushi Town, Osaki Town, Higashi Kushira Town, Kinko Town, Minamiosumi-cho, Kitsuki-cho.

 

These ash emissions continue this December 4th.

 

Sources: JMA & VAAC Tokyo

  Sakurajima - activity from 04.12.2019 / 15h42 local - webcam JMA

  Sakurajima - activity from 04.12.2019 / 15h42 local - webcam JMA

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Publié le par Bernard Duyck
Publié dans : #volcanic activity, #Sismologie
 Piton de La Fournaise - photo archive © Bernard Duyck

Piton de La Fournaise - photo archive © Bernard Duyck

The month of November 2019 will have been marked in Piton de la Fournaise by a low seismicity under the summit craters and a stop of the inflation of the building in mid-November. This shows the cessation (or at least the slowdown) of magmatic transfers from the deep zones to the more superficial zones.

 Piton de La Fournaise - Illustration of the deformation over the last six months (the eruptive and intrusive periods are represented respectively in red and green). Here we present the variations in distance between two GPS receivers crossing the Piton de la Fournaise building, at the top, at the base of the terminal cone and in the far field. A rise is synonymous with elongation and therefore swelling of the volcano; conversely, a decrease is synonymous with contraction and therefore deflation of the volcano (© OVPF-IPGP).

Piton de La Fournaise - Illustration of the deformation over the last six months (the eruptive and intrusive periods are represented respectively in red and green). Here we present the variations in distance between two GPS receivers crossing the Piton de la Fournaise building, at the top, at the base of the terminal cone and in the far field. A rise is synonymous with elongation and therefore swelling of the volcano; conversely, a decrease is synonymous with contraction and therefore deflation of the volcano (© OVPF-IPGP).

In November 2019, the OVPF recorded at the level of the Piton de la Fournaise massif in total:

- 27 superficial volcano-tectonic earthquakes (0 to 2 km deep) beneath the summit craters;

- 2 deep earthquakes (> 2 km deep);

- 269 collapses (in the crater Dolomieu and the ramparts of Enclos Fouqué).

The OVPF has registered at local and regional level:

- 57 local earthquakes (within 200 km of the island, mostly under the island, the Piton des Neiges massif);

- 3 regional earthquakes (in the Indian Ocean zone).

 

Inflation (swelling) of the building that had resumed following the end of the eruption of 11-15 August 2019 stopped in mid-November 2019.

Following the eruptive phase of 25-27 October 2019, the CO2 flux in the soil continues to increase, reaching low intermediate values.

The SO2 flux in the air in the DOAS Enclosed Enclosure is below the detection limit.

 

Source: OVPF monthly newsletter

Erta Ale - active hornito in the south crater pit - photo Henok Gebreyesus via Seigebreil Shifferaw / 30.11.2019

Erta Ale - active hornito in the south crater pit - photo Henok Gebreyesus via Seigebreil Shifferaw / 30.11.2019

Good news from the Erta Ale, with an activity that resumes in the pit crater south, with lava flow emitted by a hornito, according to the photos put online by Adventure and volcanoes (see Tanguy De Saint-Cyr Facebook's website, with Guy De Saint-Cyr and Henok Gebreyesus.)

Erta Ale - the caldera and the new lava field - image Sentinel 2 bands 12,11,4 of 30.11.2019

Erta Ale - the caldera and the new lava field - image Sentinel 2 bands 12,11,4 of 30.11.2019

Erta Ale - Hot spot in the caldera and the new lava field - image Sentinel 2 bands 12,11,4 of 30.11.2019

Erta Ale - Hot spot in the caldera and the new lava field - image Sentinel 2 bands 12,11,4 of 30.11.2019

Erta Ale - thermal anomalies on 02.12.2019 / 22h25 - Doc. Mirova_MODIS_Latest10NTI

Erta Ale - thermal anomalies on 02.12.2019 / 22h25 - Doc. Mirova_MODIS_Latest10NTI

The northern pit crater is still degassing, and small warm spots are visible south-east of the caldera in the "new" lava field.

Some thermal anomalies are reported by Mirova: between 10 and 61 MW, the highest on November 30th.

 

Sources: Adventure and volcanoes, Sentinel2 and Mirova.

Iceland - rift zones and volcanoes - Doc. From Forskning.no

Iceland - rift zones and volcanoes - Doc. From Forskning.no

Under the eastern rift zone of Iceland, it still trembles: a few small earthquakes in the Askja area, and this 1 st December, five earthquakes of magnitude> 2 under the Vanatjökull, in the northeastern zone of the Bárðarbunga caldera.

The strongest is M 3.8 on 01.12.2019 at 22.22, preceded by two precursors earthquakes of M3.0 a minute earlier ... a total of 19 earthquakes rocked the caldera since the night of 1 December .

 

Since the eruption in Holuhraun, which ended in February 2015, about 200 earthquakes> M3.0 have been measured in the Bárðarbunga caldera.

No signs of volcanic agitation have been detected.

 

Source: IMO

Vatnajökull - location, number and magnitude of earthquakes at 02.12.2019 - Doc. IMO
Vatnajökull - location, number and magnitude of earthquakes at 02.12.2019 - Doc. IMO

Vatnajökull - location, number and magnitude of earthquakes at 02.12.2019 - Doc. IMO

Askja, lava field and surrounding volcanoes - image Sentinel 1 radar - part of Öskjuvatn lake still free of ice thanks to geothermal activity - Doc. Copernicus

Askja, lava field and surrounding volcanoes - image Sentinel 1 radar - part of Öskjuvatn lake still free of ice thanks to geothermal activity - Doc. Copernicus

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Etna - glows at craters Bocca Nuova, Voragine and Nord-Est December 1 / 8:40 pm - photo INGVvulcani

Etna - glows at craters Bocca Nuova, Voragine and Nord-Est December 1 / 8:40 pm - photo INGVvulcani

At Etna, explosive activity is observed at the four summit craters on the 1st of December; The Bocca nuova, the Voragine and the northeast crater show a nocturnal glow.

A small explosion marked the new south-east crater at 9 pm local

 

Sources: INGVvulcani and Boris Behncke

At Etna, explosive activity is observed at the four summit craters on the 1st of December; The Bocca nuova, the Voragine and the northeast crater show a nocturnal glow.  A small explosion marked the new south-east crater at 9 pm local     Sources: INGVvulcani and Boris BehnckeAt Etna, explosive activity is observed at the four summit craters on the 1st of December; The Bocca nuova, the Voragine and the northeast crater show a nocturnal glow.  A small explosion marked the new south-east crater at 9 pm local     Sources: INGVvulcani and Boris Behncke

At Etna, explosive activity is observed at the four summit craters on the 1st of December; The Bocca nuova, the Voragine and the northeast crater show a nocturnal glow. A small explosion marked the new south-east crater at 9 pm local   Sources: INGVvulcani and Boris Behncke

Etna - image Sentinel-2 L1C bands 12,11,8A (snow in blue) from 01.12.2019 - one click to enlarge

Etna - image Sentinel-2 L1C bands 12,11,8A (snow in blue) from 01.12.2019 - one click to enlarge

During the last 24 hours, the instrumental monitoring network of the Nevados de Chillan complex recorded volcano-tectonic (VT) earthquakes, a long period (LP), a tremor type (TR) and a very long period (VLP) , releasing seismic energy at moderate levels.

The higher energy VT earthquake was located 1.8 km northwest of the active crater at a depth of 13 km.

When weather conditions permitted, explosive activity was recorded, with pulsatile emission of gases and particles. During the night it was possible to observe small explosions with projection of incandescent volcanic material around the active crater.

The MIROVA group reported a maximum thermal anomaly of 48 MW. Infrasound sensors recorded explosion-related signals with a maximum value of 13 Pa reduced to 1 km.

The VAAC Buenos Aires issued an ash dispersion advisory on 01.12 / 22.50 UTC at a flight altitude of 130 / 4.000 meters.

Nevados de Chillan - photo archives Nicolas Luengo via Volcanologia in Chile / 08.2019

Nevados de Chillan - photo archives Nicolas Luengo via Volcanologia in Chile / 08.2019

The emission of lava flows in blocks from the active crater and in the NNE direction, about 700 m long, partially covered three other castings of small extensions.

In addition, dense pyroclastic current deposits were observed in the immediate vicinity of the crater, in the SO, NW, N and NNE directions, with extents of 850, 670, 1680 and 440 m, respectively.

The morphological changes observed in the crater zone, maintain a tendency to the growth of crater Nicanor in its SO edge, eroding the crater Arrau, with continuous emission of pyroclasts, splashes and gases, whose eruptive plume reached 1 km high. In addition, the appearance of an opening in the NE edge of the active crater caused the intermittent emission of pyroclastic materials and gases.

Given the instrumental parameters of the internal dynamics of the volcano and the morphological changes observed recently, an explosive scenario of moderate magnitude is established (IEV = 2 to 3), associated with the possibility of a destabilization of the volcanic system, consequence of the contribution the mass and heat of a new intrusion.

 

Source: Sernageomin OVDAS - 1 December 2019 17:40 HL Estimated period from 30 November (15:00 HL) to 1 December (15: 0 0 HL)

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Colima - collapse / subsidence of the crater interior - photo 08.07.2019 / Courtesy of CUEIV-UdC (Boletin Seminal of the Colima Volcano Actividad 12 julio 2019 no 129)

Colima - collapse / subsidence of the crater interior - photo 08.07.2019 / Courtesy of CUEIV-UdC (Boletin Seminal of the Colima Volcano Actividad 12 julio 2019 no 129)

Colima - state of the summit crater in May 2019 - photo 22.05.2019 / 10:34 Courtesy of CUEIV-UdC

Colima - state of the summit crater in May 2019 - photo 22.05.2019 / 10:34 Courtesy of CUEIV-UdC

A special opinion of activity of the Colima volcano in Mexico was issued by CONAGUA on November 30 at 9am.

An emission of ash and / or gas and water vapor began its trajectory to the northeast of the state of Colima, and moves north northeast of Mexico, based on information Cenapred-Segob and from NOAA / VAAC Washington.

No new field observation supports this info.

Colima - Prognosis of ash trajectory for 30.11.2019 / 06h UTC - Doc. CONAGUA

Colima - Prognosis of ash trajectory for 30.11.2019 / 06h UTC - Doc. CONAGUA

After two years of calm, the Colima has resumed activity since the end of April 2019, with an increase in seismicity. An explosion is reported by the CUEIV-UdC / lCentro Universitario de Estudios e Investigaciones de Vulcanologia - Universidad de Colima - on May 11, 2019, and small explosions and intermittent emissions of gas and steam recorded between July 5 and 12. An overflight of the volcano on July 9 reveals the increase in the diameter of the vent, probably caused by subsidence in the crater.

 

Sources: Conagua special opinion of 30.11.2019 at 9 am and 1 pm ; VAAC Washington and Global Volcanism Program

Taal - photo NASA Earth Observatory images by Joshua Stevens, using Landsat 8 / OLI data from the U.S. Geological Survey. Caption by Kathryn Hansen.

Taal - photo NASA Earth Observatory images by Joshua Stevens, using Landsat 8 / OLI data from the U.S. Geological Survey. Caption by Kathryn Hansen.

A note of December 1 by the Phivolcs recalls the current level of activity of the volcano Taal, in alert level 1.

Since March 28, 2019, date of raising the alert level, the Phivolcs recorded a total of 4,857 volcanic earthquakes, intensity felt levels of 1 to 3, accompanied by rumblings.

Measurements from November 21 to November 29, 2019 confirm an inflation of the volcano, consistent with GPS measurements, an increase in carbon dioxide emissions (started in April 2019). They do not notice any significant changes in water temperature or acidity in the main crater lake.

Taal main crater lake - photo ULB

Taal main crater lake - photo ULB

Vigilance is recommended for communities on the volcanic island, especially in view of the December 1 weather report regarding the trajectory of Typhoon Tisoy. The main crater remains strictly forbidden due to possible and sudden explosions of steam and an accumulation of toxic gases. The northern part, close to Daang Kastila road, is considered dangerous because of a possible increase of steam emissions. at the level of cracks. The entire island -volcano is considered PDZ / permanent danger zone.

 

Source: Phivolcs

Philippines archipelago - Expected trajectory of Typhoon Tisoy / Kammuri on 01.12.2019 - PAGASA image

Philippines archipelago - Expected trajectory of Typhoon Tisoy / Kammuri on 01.12.2019 - PAGASA image

Philippines archipelago - Himawari satellite image of Typhoon Tisoy at 01.12.2019 / 17h loc.- Image from NOAA

Philippines archipelago - Himawari satellite image of Typhoon Tisoy at 01.12.2019 / 17h loc.- Image from NOAA

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
Sabancaya - 29.11.2019 / 17:51 - Ingemmet / OVI thermic camera

Sabancaya - 29.11.2019 / 17:51 - Ingemmet / OVI thermic camera

Due to the explosions of the Sabancaya volcano, abundant ash falls are recorded in the cities of the Colca Valley, in the province of Caylloma, in the region of Arequipa, Ingemmet announced today.

The Sabancaya records eruptions with dome growth and moderate explosions with bombs (rock fragments over 6.4 centimeters) falling near the crater.

In the last 24 hours, Sabancaya had 15 explosions with a maximum height of 2,700 meters above the crater (12:28), said the Vulcanological Observatory of Ingemmet (OVI). In the afternoon, Sabancaya continued with explosions and emitting ashes.

 

Source: Ingemmet / OVI

Sabancaya - activity report # 30 of the Ingemmet of 29.11. 2019 / 9h

Sabancaya - activity report # 30 of the Ingemmet of 29.11. 2019 / 9h

The episodic eruption of the Shishaldin volcano continues. The seismic levels were variable during the week, with high activity at the beginning of the week and during the last 36 hours. Satellite image analysis indicates that a partial collapse of the summit cone occurred early on November 25th. This resulted in a pyroclastic flow extending up to 3 km from the summit, on the northwestern side of the volcano. A new lava flow was also generated during this period of activity that extended for 1 km along the northwest flank of the volcano.

Shishaldin RSAM 29-30.11.2019 - Doc. AVO


The seismicity was high, but variable in the middle of the week and increased again during the night, accompanied by very high surface temperatures suggesting a new lava effusion. Persistent Clouds Darken Observations of Eruptive Activity in Web Cameras

The Mirova site informs for November 29 thermal anomalies of 22 and 39 MW.

Shishaldin is monitored by local seismic and infrasound sensors, satellite data, web cameras, a geodetic and tilt telemetric network, and remote infrasound and lightning networks.

The alert level is Watch and the aviation code remains orange.

The Shishaldin Volcano, located near the center of Unimak Island in the eastern Aleutian Islands, is a spectacular symmetrical cone with a base diameter of about 16 km (10 mi).

 

Sources: AVO, Mirova and Sentinel 2

 Shishaldin - image Sentinel-2 / 3D natur. Swir from 26.11.2019 - Copernicus

 Shishaldin - image Sentinel-2 / 3D natur. Swir from 26.11.2019 - Copernicus

The activity of Aso and Sakurajima continues on Kyushu.

At the Aso, ash emissions continue and are the subject of an opinion from VAAC Tokyo: dispersion to the east, then NNE.

On the 30th at 11:59, an eruption occurred at Sakurajima (crater at the top of Minamidake) and the volcanic plume rose to 2,300 m above the edge of the crater.

Volcanic ash disperses west towards Kagoshima City.

 

Sources: JMA AND VAAC Tokyo

Asosan - Ash Advisory Volcanoes - Doc. VAAC Tokyo 20.11.2019

Asosan - Ash Advisory Volcanoes - Doc. VAAC Tokyo 20.11.2019

Sakurajima - activity of 30.11.2019, respectively at 12h and 12h06 local - webcam JMA
Sakurajima - activity of 30.11.2019, respectively at 12h and 12h06 local - webcam JMA

Sakurajima - activity of 30.11.2019, respectively at 12h and 12h06 local - webcam JMA

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Publié le par Bernard Duyck
Publié dans : #volcanic activity
Popocatépetl - emissions and hot spot from 28.11.2019 - Sentinel-2 L1C image bands 12,11,4

Popocatépetl - emissions and hot spot from 28.11.2019 - Sentinel-2 L1C image bands 12,11,4

At Popocatépetl, 148 exhalations were identified during the last 24 hours, accompanied by water vapor, gas and sometimes ash in small to moderate amounts. The most relevant ones were recorded today at 8:19, 9:14 and 9:47.

Similarly, 315 minutes of tremor were recorded.

An explosion occurred on November 28 at 2:33 am, accompanied by a column of ash about 1000 m above the crater, which moved to the northwest.

Meanwhile, there has been a continuous emission of gas and small amounts of ash scattered to the northwest by the prevailing winds, also visible on the image of the Sentinel2 satellite.

Alert level remains at Amarillo Fase 2

 

Sources: Cenapred, Proteccion Civil and Sentinel 2

Popocatépetl - explosion of 28.11.2019 / 02:34 - webcams from Mexico / Cenapred

Popocatépetl - explosion of 28.11.2019 / 02:34 - webcams from Mexico / Cenapred

In Costa Rica, seismic activity continued at Rincon de la Vieja with the appearance of long-term signals (about two dozen) and two volcano-tectonic signals, the two types of signals recorded in most stations near of the volcano.

The spasmodic tremor has decreased in amplitude as of October 31 and continues to this day.

On 19 November, the installation of a GPS / GNSS precision station, for monitoring the cracks in the southern flank of the active crater, was finalized.

The RSN teams, in collaboration with Francisco Muñoz from OVSICORI, took thermal photographs of the fumaroles located in the western sector of the active crater and the acidic lake. The maximum temperature recorded in the fumaroles was 93°C, and 32°C in the lake.

Rincon de La Vieja - the acid lake and the new GPS station - RSN photo

Rincon de La Vieja - the acid lake and the new GPS station - RSN photo

In Poas, the crater lake maintained its surface area compared to the previous week.

The color of the water tends to be greenish. Evaporation processes were a little more intense than the previous week and rainfall decreased. The field of sulfur-rich fumaroles in the northeast maintains its exhalation activity. At the mouth A, bubbling and emission of gas were observed.

At the seismic level, the tremor of small amplitude was maintained (2 to 4.5 Hz), as well as discrete events of type LP (long duration) of low amplitude.

Visitors to the Poás Volcano National Park are reminded that this site has protocols for eruptions.

 

During the day of November 28, when it was raining heavily, the lagoon was observed with a coffee color due to the entry of the sediments transported by the water. In the upper photo, taken in the afternoon, the lake had already recovered its greenish color.

 

Sources: Ovsicori and RSN / weekly report.

Poas - lake color changes on 28.11.2019 - webcam photos respectively at 8:58 and 16:03 / RSN

Poas - lake color changes on 28.11.2019 - webcam photos respectively at 8:58 and 16:03 / RSN

The effusive activity of Fuego in Guatemala is on the rise; the night and early morning glow is completed by the observation of moderate thermal anomalies, included in recent days between 18 and 91 MW, according to Mirova.

The seismic tremor, associated with the rise of the magma that feeds the lava flows, has been maintained in duration and amplitude.

The active lava flow in the direction of the Ceniza barranca is about 600 meters, with avalanches and steam at the head of the stream. If the effusion ratio continues to increase, new flows may occur in other drainages.

At the same time, moderate gas and ash emissions are observed.

 

Source: Insivumeh 28.11.2019 12:30 local report, Mirova & Sentinel 2

Fuego - hot point of the lava effusion on 26.11.2019 - Sentinel-2 L1C image bands 12,11,4

Fuego - hot point of the lava effusion on 26.11.2019 - Sentinel-2 L1C image bands 12,11,4

Fuego - thermal anomalies on 29.11.2019 - Doc. Mirova_MODIS_Latest10NTI

Fuego - thermal anomalies on 29.11.2019 - Doc. Mirova_MODIS_Latest10NTI

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