Overblog
Suivre ce blog Administration + Créer mon blog

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
 Nevado del Huila - photo archive Martin Roca

Nevado del Huila - photo archive Martin Roca

Servicio Geologico Colombiano has issued an activity bulletin for the week of 4 to 10 December in Nevado del Huila, in activity level 3 / amarillo / behavioral change of volcanic activity.

The seismicity was marked by 226 earthquakes, of which 118 VT type in relation to the fragmentation of rocks, and 148 earthquakes, LP in majority, related to the dynamics of the internal fluids. The images of the webcams shows a degassing during the week.

The volcano continues to exhibit stable behavior.

Source: Servicio Geologico Colombiano 11,12,2018 / 18h loc.

Turrialba - ash emissions on 12.12.2018 / 7:59 - webcam Ovsicori

Turrialba - ash emissions on 12.12.2018 / 7:59 - webcam Ovsicori

In Costa Rica, sporadic ash eruptions have persisted in Turrialba for a few days, accompanied by plumes up to 500 meters above the crater.

The variable winds carried the ashes northward in the early hours of December 12, before turning south-west, where the Central Valley was again affected.

Source: Ovsicori

Cleveland - photo Cindy Werner / AVO USGS / 07.2016

Cleveland - photo Cindy Werner / AVO USGS / 07.2016

A small explosion was detected by the local seismic network in Cleveland, in Aleutian Islands, on 12 December at 11:53 am AKST / 20:53 UTC, justifying a watch / orange warning adjustment.

The weather conditions did not allow the observation of a cloud of ashes.

No significant activity was detected in the previous days.

Source: AVO

Manam - the two craters correspond to the 2 hotspots on this image Sentinel 2 bands 12,11,4 / 11.12.2018 - one click to enlarge

Manam - the two craters correspond to the 2 hotspots on this image Sentinel 2 bands 12,11,4 / 11.12.2018 - one click to enlarge

On the island-volcano of Manam, Papua New Guinea, a satellite image of December 11 shows two hot spots, corresponding to the two summit craters. Mirova reports a small thermal anomaly of 9 MW on December 12th.

The people of Manam silently mobilized last week and filed a human rights complaint against the government for having placed them in health centers for nearly 15 years.

Local government president Kenny Boli said residents of Manam were living peacefully before the 2004 volcanic eruption when they were transferred to health centers in Potsdam, Bom, Daigul, Asuramba and Mangem.

He added that the villagers of Baliau and Dugulava had been involved in tribal fighting with residents of Bogia and had been forced to return to the volcanic island to settle.

The planning director of Madang Province said that the National Treasury issued a mandate of 2,000,000 KAR for the resettlement planning process, but no cash amount was released.

The population has been tired of living in health centers for 14 years and has now started legal proceedings.

Source: The National, Sentinel 2 & Mirova

Lire la suite

Publié le par Bernard Duyck
Publié dans : #volcanic activity
 Sheveluch - photo archives Volkstat 06.2017

Sheveluch - photo archives Volkstat 06.2017

VAAC Tokyo issued an ash dispersion report for Sheveluch, in relation to a possible eruption, in view of the satellite imagery and various reports, on December 12 at 1:17 am

As the KVERT reports only moderate outgassing, it is possible that remobilized ash is involved. Aviation color code is orange

Sources: VAAC Tokyo and KVERT

Sheveluch - Volcanic ash advisory 12.12.2018 - Doc.VAAC Tokyo

Sheveluch - Volcanic ash advisory 12.12.2018 - Doc.VAAC Tokyo

In Kilauea, the HVO does not signal big changes. Ashes are remobilized in the summit area by the winds.

Seismicity is low at the summit, and in the eastern rift zone. A small inflation marks the bottom of the rift zone from Pu'u O'o.

A summary of the 2018 eruption has been published in Science, which concludes that this eruption was the largest of the last 200 years, with in four months, with 0.83 km³ of lava emitted over a surface of 37.5 km² , and adds more than one square kilometer of new land.

The data provided by the control instruments provided a good insight into how the magma moved, the pressure drop at the top and the collapse of Pu'u O'o and Halema ' uma'u.

Volcanologist Mike Poland said that although Kilauea would remain silent for the next 20 years, there would be no problem for scientists. In addition to studying all the data collected during the eruption, HVO researchers now have a rare opportunity to watch the magma system of the volcano rebuild after massive bleeding.

Kilauea East Rift Zone - lava flows May 19, 2018 - Photo Bruce Omori - Paradise Helicopters / EPA-EFE / Shutterstock - in Time Top 100 photos of the year 2018

Kilauea East Rift Zone - lava flows May 19, 2018 - Photo Bruce Omori - Paradise Helicopters / EPA-EFE / Shutterstock - in Time Top 100 photos of the year 2018

Time has featured in his "Top 100 Images of the Year" a photo of lava flows taken by Bruce Omori. Congratulations to Bruce for the many excellent photos provided during this eruption.

Sources: HVO-USGS, Science, Time magazine

Kanlaon - photo archives 2017 - via J. Sincioco

Kanlaon - photo archives 2017 - via J. Sincioco

As reported yesterday by the Phivolcs, the number of volcanic earthquakes in Kanlaon has increased in recent days ... in the day of December 11, the number of volcanic earthquakes has tripled compared to the previous 24 hours, with 58 episodes accounted for.

The other parameters remain more or less the same, as well as the alert level maintained at 2.

To be continued ...

Source: Phivolcs

Christmas illuminations in Catania with the participation of Etna - photo Roberto Viglianisi

Christmas illuminations in Catania with the participation of Etna - photo Roberto Viglianisi

Catania and Etna have come together to offer splendid Christmas lights to Sicily.

Source: Roberto Viglianisi

Lire la suite

Publié le par Bernard Duyck
Publié dans : #volcanic activity
Fuego the active crater - photo Fuego by drones via Armando Pineda

Fuego the active crater - photo Fuego by drones via Armando Pineda

Fuego by drones

... or the Fuego surveillance work by a team from the University of Liverpool, Sheffield and Insivumeh in October - December.

The members of this team traveled more than 1,400 km to visit all the seismic stations and infrasonic measurement sites, and worked on the seismic stations Fg10 and FG11; they used UV cameras, thermal imaging cameras and overflights by drones of volcanoes and barrancas crossed to access them.

 

Source: Volcán de Fuego con Universidad de Liverpool and Sheffield Nov-Dic - via Armando Pineda, Silvio de Angelis, Alejandro Diaz Moreno

Fuego - work of the teams from the University of Liverpool, Sheffield and Insivumeh in October - December. - photo via Armando Pineda

Fuego - work of the teams from the University of Liverpool, Sheffield and Insivumeh in October - December. - photo via Armando Pineda

Fuego - work of the teams from the University of Liverpool, Sheffield and Insivumeh in October - December on a new measuring station - photo via Armando Pineda

Fuego - work of the teams from the University of Liverpool, Sheffield and Insivumeh in October - December on a new measuring station - photo via Armando Pineda

Fuego - post-eruption developments on a barranca - the size of the construction machinery on the left gives the scale - photo Fuego by drones via Armando Pineda

Fuego - post-eruption developments on a barranca - the size of the construction machinery on the left gives the scale - photo Fuego by drones via Armando Pineda

A statement from Rabaul volcano observatory about the Manam eruption on December 8, 2018 reveals that the volcanic system is still dynamic and has potential for future activity. In fact, the volcano showed three eruptions in four months, as well as other signs of its activity: plumes of ash, audible noises and incandescence.

The GVP reports gray-brown plumes on October 2, and brown or dark gray ash emissions in the period of October 2 to 12, 2018.

The observatory recommends that people take precautions concerning possible mudslides, and avoid doing activities in the four main drainage valleys.

 

Sources: Rabaul volcano observatory via Loop PNG

Manam - Sentinel image 2 bands 12,11,4 from 12.10.2018

Manam - Sentinel image 2 bands 12,11,4 from 12.10.2018

Manam - radiative power log in 2018 - Doc.Mirova

Manam - radiative power log in 2018 - Doc.Mirova

In Kanlaon / Philippines, seismicity is characterized by volcanic earthquakes (29 reported by Phivolcs on December 9, 16 on December 10, and 17 on December 11).

Moderate emissions of plumes loaded with steam are observed.

The deformation data reflect a pronounced inflation since December 2017, and confirm a pressurization of the volcano. Sulfur dioxide emissions remain moderate, with 101 tonnes / day on 09.12.

The alert level remains at 2 / moderate instability ... will this magmatic intrusion lead to an eruption or not?

 

Source: Phivolcs

Kanlaon Summit - unreferenced author

Kanlaon Summit - unreferenced author

Lire la suite

Publié le par Bernard Duyck
Publié dans : #volcanic activity
Poas - the acidic lake has taken an unusual color, green tinged with yellow - photo RSN 08.12.2018 / 8h42

Poas - the acidic lake has taken an unusual color, green tinged with yellow - photo RSN 08.12.2018 / 8h42

A change of color is reported by the rangers of the Poas Park: the acidic lake has changed from its usual turquoise color to  green tinged with yellow.

Poas - the acid lake in 2007 - photo B.Duyck

Maria Martinez, geochemist at Ovsicori, explains this change, unusual for two centuries, by the injection of sulfur dioxide by sub-lacustrine fumaroles, and the incidence of visible blue light that combines with the yellow of sulfur with as result, the current green tint.

Laguna Caliente has a greater or lesser degree of degassing, masking its surface at times. No eruptions are reported, and the activity remains similar to the previous days.

 

Source: Ovsicori & RSN

Poas - outgassing more important on 08.12.2018 / 05:38pm - Ovsicori webcam

Poas - outgassing more important on 08.12.2018 / 05:38pm - Ovsicori webcam

The Turrialba is the seat on December 8 and 9 of various eruptive episodes; among these, on December 8 at 7:49, an episode was accompanied by a plume of ash and gas 800 meters above the summit.

On December 9, Ovsicori reported an eruption at 6:52 local time, accompanied by a plume of ash 1,000 meters above the active crater.

Ash falls are reported on the Central Valley, affecting various places in the national parks of Turrialba and Irazu volcanoes, including Coronado, San Jerónimo, Granadilla, Guadalupe, Ipís, Moravia, Tibás, San José, Pavas, Zapote, San Pedro, Sabanilla , Heredia, San Isidro, Santo Domingo, San Rafael, Santa Bárbara, Barva, Alajuela, etc.

 

Source: Ovsicori & RSN

Turrialba - ash plume 09.12.2018 / 07:59 - webcam Ovsicori

Turrialba - ash plume 09.12.2018 / 07:59 - webcam Ovsicori

 Turrialba - Ash emission on 09.12.2018 / 11h06 - RSN webcam

Turrialba - Ash emission on 09.12.2018 / 11h06 - RSN webcam

Turrialba - plume and cloud of ash on 9.12.2018 at 8:21, seen from the neighboring volcano Irazu - photo Ovsicori

Turrialba - plume and cloud of ash on 9.12.2018 at 8:21, seen from the neighboring volcano Irazu - photo Ovsicori

The eruption continues at Dukono, with this December 9, the emission of a thick plume white-greyish 500-700 meters above the crater.

A VAAC Darwin Ash dispatch an advisory showing  their impact on Halmahera Island, with the southwesterly and southerly winds.

The PVMBG recorded for 09.12. 2018, 6 emission earthquakes, and continuous tremor with a dominant amplitude at 2 mm (amplitude 0.5 - 5 mm)

The activity level remains at 2 / waspada, with a no-go zone of 2 km radius around the Malupang Warirang crater.

Sources: PVMBG / Mgma Indonesia & VAAC Darwin

 Dukono - white plume on 09.12.2018 / 8:07 AM WIT - photo Magma Indonesia

 Dukono - white plume on 09.12.2018 / 8:07 AM WIT - photo Magma Indonesia

Dukono - volcanic ash adivisory of 10.12.2018 / at 5:25 - Doc. VAAC Darwin IDY65290

Dukono - volcanic ash adivisory of 10.12.2018 / at 5:25 - Doc. VAAC Darwin IDY65290

At Popocatépetl, the last 24 hours are marked by 55 low intensity exhalations and 4 explosions, respectively 08.12 on 12:27, and on 09.12 at 01:39, 07:51 and 10:35, accompanied by plumes of ash between 1,300 and 2,000 meters, and ejection of incandescent fragments on the slopes of the volcano.

At the seismicity level, 45 minutes of low amplitude harmonic tremors and 3 volcano-tectonic earthquakes of M 1.5, 2.7 and 2.7 were recorded.

Popocatépetl - beginning of the explosion of 09.12.2018 / 7h52 - WebcamsdeMexico

Popocatépetl - beginning of the explosion of 09.12.2018 / 7h52 - WebcamsdeMexico

A public information effort is needed to clarify the activity in progress, to explain the alert levels and to recall the advice in case of ash falls in the form of clear and accessible diagrams.

Sources: Cenapred & Seguridad

Information available to the public made by Cenapred & Seguridad - one click to enlarge the thumbnailsInformation available to the public made by Cenapred & Seguridad - one click to enlarge the thumbnails
Information available to the public made by Cenapred & Seguridad - one click to enlarge the thumbnailsInformation available to the public made by Cenapred & Seguridad - one click to enlarge the thumbnails

Information available to the public made by Cenapred & Seguridad - one click to enlarge the thumbnails

Lire la suite

Publié le par Bernard Duyck
Publié dans : #volcanic activity
 Manam - the eruptive plume of 08.12.2018 seen tunes - ex. Brian Malone video

Manam - the eruptive plume of 08.12.2018 seen tunes - ex. Brian Malone video

Manam - 08.12.2018 photo taken from a ship of U.S. Navy via Jhay Mawengu / Facebook

Manam - 08.12.2018 photo taken from a ship of U.S. Navy via Jhay Mawengu / Facebook

A phase of explosive activity began December 8 at 13h local / 03h UTC at Manam volcano in Papua New Guinea.

The ash and gas plume rose more than 13.5 km, drifting east and northeast. Strong ashfall on the island is reported by observers (planes and US Navy ship), blocking the sun's rays and hiding the volcano's summit.

According to VAAC Darwin, the plume should dissipate within three hours.

Manam - 08.12.2018 - photo Scott Waide / Twitter

Manam - 08.12.2018 - photo Scott Waide / Twitter

Manam - 08.12.2018 - bulletin and Volcanic ash advisory of VAAC Darwin, respectively at 09hZ and 13h20Z - one click to enlargeManam - 08.12.2018 - bulletin and Volcanic ash advisory of VAAC Darwin, respectively at 09hZ and 13h20Z - one click to enlarge

Manam - 08.12.2018 - bulletin and Volcanic ash advisory of VAAC Darwin, respectively at 09hZ and 13h20Z - one click to enlarge

Manam 08.12.2018 - thermal anomalies at 3:45 pm - Doc Mirova_MODIS_VRP
Manam 08.12.2018 - thermal anomalies at 3:45 pm - Doc Mirova_MODIS_VRP

Manam 08.12.2018 - thermal anomalies at 3:45 pm - Doc Mirova_MODIS_VRP

Manam eruption 08.12.2018 / video Brian Malone

A previous eruptive phase dates from August 25, 2018. It was characterized by an eruptive plume at 15.2 km, and lava flows and pyroclastics in a valley NE of the island, which buried 6 houses (in GVP - link)

Sources: Madang Province news (via Shérine France), VAAC Darwin, Mirova, Scott Waide and Brian Malone / Twitter

Aqueous eruption of Steamboat geyser on 04.06.2018 - Photo by Jamie Farrell, University of Utah via USGS

Aqueous eruption of Steamboat geyser on 04.06.2018 - Photo by Jamie Farrell, University of Utah via USGS

The USGS reports the 30th water eruption 2018 of the Steamboat geyser, which is a record, at Yellowstone National Park this December 8 at 1:07 local.

These spectacular water eruptions do not imply a change in the volcanic activity of Yellowstone.

Source: USGS

Dukono - 08.12.2018 / 9h11WIT - photo Magma Indonesia

Dukono - 08.12.2018 / 9h11WIT - photo Magma Indonesia

An eruption occurred this December 8 at 9:12 local at Dukono volcano in the Moluccas. An ash plume developed to a height of 1529 meters asl. The eruption continues.

VAAC Darwin plans to ashes move west and then southwest.

An orange VONA has been issued and the activity level is 2 / waspada, with a 2 km radius ban around the Malupang Warirang crater. Ashes can fall on the island, a mask protection is recommended.

Source: PVMBG / Magma Indonesia
 

Dukono - Volcanic ash advisory at 09.12.2018 / 09h25 - Doc. VAAC Darwin IDY65290

Dukono - Volcanic ash advisory at 09.12.2018 / 09h25 - Doc. VAAC Darwin IDY65290

An eruption of Anak Krakatau on 9 December 2018 at 1050 WIB was accompanied by a column of ash observed at ± 700 m above the summit (± 1038 m above sea level). The column of ash is black and thick, leaning northward. This eruption is recorded on a seismogram of maximum amplitude of 57 mm and a duration of ± 5 minutes 29 seconds. Currently, G. Anak Krakatau is in Status Statute II (Waspada) with recommendations not to approach the crater within 2 km of the crater.

Source: PVMBG

Lire la suite

Publié le par Bernard Duyck
Publié dans : #volcanic activity

On December 7 at 3:13 local time, the Sernageomin recorded at the Nevados de Chillan complex an explosive event associated with an LP earthquake, in relation to the dynamics of internal fluids.

An incandescence, related to the emission of gas and pyroclasts at high temperature, was observed on webcams; the fallout remained close to the active crater.

This activity remains in the current orange alert standards, and maintained.

Nevados de Chillan - picture Sernageomin

Nevados de Chillan - picture Sernageomin

On the same day, between 13:05 and 13:40 local, the webcams of Planchón - Peteroa recorded an emission of particulate materials at a height of 1,300 meters, dispersing towards the ESE; the show was accompanied by tremor.

The complex remains on Amarilla technical volcanic alert ... other similar or more energetic episodes are likely to occur

Source: Sernageomin

Planchón - Peteroa - photo of the activity of 07.11.2018 / 17h / Sernageomin

Planchón - Peteroa - photo of the activity of 07.11.2018 / 17h / Sernageomin

At Popocatépetl, three explosions occurred on December 7th, at 6h43, 22h44 and 23h22 local respectively; they were accompanied by ash plumes at 1,800, 1,500 and 2,000 meters, and emissions of incandescent fragments on the flanks of the volcano.

The activity remains in the context of the Amarillo Fase 2 volcanic alert, and the observatory reminds the safety zone of 12 km to be respected, and the recommendations in case of falls of ashes.

Sources: Cenapred and Proteccion Civil Seguridad

Popocatépetl - explosions from 07.12.2018 to 6h47,22h45 and 23h23 respectively - images WebcamsdeMexico
Popocatépetl - explosions from 07.12.2018 to 6h47,22h45 and 23h23 respectively - images WebcamsdeMexico
Popocatépetl - explosions from 07.12.2018 to 6h47,22h45 and 23h23 respectively - images WebcamsdeMexico

Popocatépetl - explosions from 07.12.2018 to 6h47,22h45 and 23h23 respectively - images WebcamsdeMexico

An interesting development of volcanologists Boris Behncke and Marco Neri on the ongoing activity at the NSEC of Etna: it concerns the location of the small cone of slag, and the mouth at the origin of the lava flow and incandescent blocks, and fluctuations in activity.

Frequent changes in the direction mark the lava flows, which extend a few hundred meters east side of the NSEC, then stop. The magma takes two paths to the surface: one towards the cone of slag, seat of Strombolian activity, the other towards a mouth where accumulate viscous lava, which often have difficulty to sink and generate bearings of incandescent blocks. Both types of activity, explosive and effusive, show fluctuations.

Source: INGV Vulcani Wordpress Blog / 07,12,2018

Diagram of the theater of activity at the eastern mouth of the new crater southeast / made on the basis of photo taken on 05.12.2018 by Gianni Pennisi / via article INGV Vulcani Wordpress

Diagram of the theater of activity at the eastern mouth of the new crater southeast / made on the basis of photo taken on 05.12.2018 by Gianni Pennisi / via article INGV Vulcani Wordpress

Etna - strombolian activity from the cone of slag, and effusive from the oriental mouth - photo Gio Giusa 29.11.2018

Etna - strombolian activity from the cone of slag, and effusive from the oriental mouth - photo Gio Giusa 29.11.2018

The volcanological observatory of the Soufrière of Guadeloupe observes an increase in seismicity since the beginning of 2018. In the first part of the year this progression culminated with the very energetic crisis of the end of April. In addition, since 4 August 2018, the OVSG-IPGP has recorded a further marked increase in the number of earthquakes distributed in seismic swarms (total of 6 swarms with a peak of at least 50 earthquakes per day as of 31 October) of very low energy which succeed one another in a close manner in time. In October, a total of 1257 earthquakes of volcanic origin - 1,255 earthquakes VT and 2 LP - were recorded, located essentially between 500 and 1,500 m of depth under the summit. This increase of the seismicity recorded since August 4 is not therefore not directly related to this better resolution of the observation networks.

Soufrière of Guadeloupe - the Tarissan gouffre, which should be named after a vet who accidentally fell in it in the 19th century. - photo Stromboli on line

Soufrière of Guadeloupe - the Tarissan gouffre, which should be named after a vet who accidentally fell in it in the 19th century. - photo Stromboli on line

This recrudescence marks a change in the behavior of La Soufrière during the last months which involves other processes related to the circulation of fluids. An intensification of this trend could have implications for the phenomena that characterize the summit of Soufriere. Indeed, we can not exclude the possibility that the following phenomena occur suddenly and very localized: formation of geyser with projection of hot and acid mud, projections of ash and fragments over a few meters, sudden vaporization of liquid in overpressure , as well as the opening of new fumaroles.

The gaseous fumes in the vicinity and leeward of the main fumaroles of the summit (notably the Crater South, the Tarissan, and the Gouffre 1956) present, since 1998, proven risks of irritation and burns (eyes, skin, respiratory tracts) and hot and acid mud projections. Due to the presence of these toxic gases, a by-law of the city of Saint-Claude prohibits public access to certain areas of the summit.

The volcanic alert level remains alert / yellow.

Source: October monthly report of the volcanic activity of Soufriere Guadeloupe and regional seismicity.

Soufrière of Guadeloupe - the andesitic dome - photo Stromboli on line

Soufrière of Guadeloupe - the andesitic dome - photo Stromboli on line

Lire la suite

Publié le par Bernard Duyck
Publié dans : #volcanic activity
Etna - the "puttusiddu" of the NSEC seen from Milo - phot 06.12.2018 / 8h Boris Behncke

Etna - the "puttusiddu" of the NSEC seen from Milo - phot 06.12.2018 / 8h Boris Behncke

At Etna, three craters are still active this December 6, the Northeast, the Bocca Nuova and the new crater Southeast and its lava flow, marked by thermal anomalies reported by Mirova between 16 and 162 MW they days.

Sources: Sentinel 2, Boris Behncke and Gio Giusa

Etna 06.12.2018 - picture Sentinel2 nat colors

Etna 06.12.2018 - picture Sentinel2 nat colors

Etna 06.12.2018 - three craters present a thermal signal - images Sentinel2 Swir on the left, and bands 12,11,4 on the right - one click to enlargeEtna 06.12.2018 - three craters present a thermal signal - images Sentinel2 Swir on the left, and bands 12,11,4 on the right - one click to enlarge

Etna 06.12.2018 - three craters present a thermal signal - images Sentinel2 Swir on the left, and bands 12,11,4 on the right - one click to enlarge

Etna - thermal anomalies on 07.12.2018 - Doc.Mirova

Etna - thermal anomalies on 07.12.2018 - Doc.Mirova

The Sernageomin / OVDAS recorded on December 6 from 3:20pm a seismic swarm in Copahue; 200 volcano-tectonic earthquakes, associated with rock fracturing, occurred 6.2 km at the ENE of thecrater El Agrio.

The strongest earthquake, from ML 3.1, is recorded at 15:56 at a depth of 4,600 meters.

The superficial activity of the volcano is characterized as the days before by a plume of gas and fine particles at a height of about 800 meters.

The alert level remains in Amarillo.

Source: Sernageomin

Copahue seen from Caviahue on 01.12.2018 - Photo Valecaviahue

Copahue seen from Caviahue on 01.12.2018 - Photo Valecaviahue

At Popocatépetl, we notice, besides the exhalations, an explosion on December 6th at 1:17 pm; it was accompanied by a plume of gas, steam and ash that rose to 2,500 meters above the summit, before dispersing to the northwest.

Sources: Cenapred & Proteccion Civil Seguridad

Popocatépetl - the eruptive plume from 06.12.2018 to 13:25 - photos WebcamsdeMexico
Popocatépetl - the eruptive plume from 06.12.2018 to 13:25 - photos WebcamsdeMexico

Popocatépetl - the eruptive plume from 06.12.2018 to 13:25 - photos WebcamsdeMexico

The growth of the Merapi dome continues at the rate of 2,200 m³ per day, a little down between November 29 and yesterday. The summit dome reached the volume of 244,000 m³ on December 6th.

A thick whitish plume is observed 50 meters above the summit.

The seismicity of 06.12 is characterized by 52 eruption earthquakes, 14 emission earthquakes, 11 low frequency earthquakes and one hybrid earthquake.

The activity level remains at 2 / waspada

Source: PVMBG

Merapi - evolution of the dome between November 29 and December 6, 2018 - Doc. PVMBG

Merapi - evolution of the dome between November 29 and December 6, 2018 - Doc. PVMBG

Lire la suite

Publié le par Bernard Duyck
Publié dans : #volcanic activity
Lascar - photo Sernageomin

Lascar - photo Sernageomin

In northern Chile, the Lascar volcano, which is still on alert "Verde" , has thermal anomalies; they have been reported by the MIROVA site since 21.11.2018 with a peak of 52 MW on 5 December.

This increase in heat flux is concomitant with another of the sulfur dioxide emissions, detected by the Sentinel 5P-Tropomi satellite.

Lascar - thermal anomalies from 21.11 to 06.12.2018 / 3h - Doc.Mirova Modis

Lascar - thermal anomalies from 21.11 to 06.12.2018 / 3h - Doc.Mirova Modis

Lascar - sulfur dioxide emissions on 22.11.2018 - image Sentinel 5P Tropomi via Simon Carn

Lascar - sulfur dioxide emissions on 22.11.2018 - image Sentinel 5P Tropomi via Simon Carn

The Sernageomin reported in its last report (October 1 to 31) 11 VT earthquakes associated with rock fracture at a depth of 7.6 km, and 140 LP earthquakes in relation to the dynamics of internal fluids.

On the webcams, a recurrent degassing at the central crater, with a predominant magmatic component, is observed, rising about 650 meters above the active crater.

Thermal camera's glow is visible at night.

Sources: Sernageomin and Sentinel 5P / Simon Carn

Lascar - nocturnal glow within active crater - webcam 06.12.2018 / 7h04 Sernageomin

Lascar - nocturnal glow within active crater - webcam 06.12.2018 / 7h04 Sernageomin

At Veniaminof, where the eruption continues, analysis of a December 2 satellite image shows a third lava lobe extending a short distance on the southeast flank of the intra-caldera cone.

A continuous low level tremor is detected in the last few days.

Alert levels remain unchanged.

Source: AVO

Veniaminof - plume over cone and tephra / ash deposits up to Perryville - Doc.Dietterich, Hannah / AVO; ESA Sentinel-2 on 22.11.2018 / 21:48 

Veniaminof - plume over cone and tephra / ash deposits up to Perryville - Doc.Dietterich, Hannah / AVO; ESA Sentinel-2 on 22.11.2018 / 21:48 

In Fuego, the day of December 5 was marked by a few explosions accompanied by plumes of gray ash at a height of 4,500-5,000 meters asl. dispersing to the west and southwest over 25 km.

Incandescent impulses are reported at a height of 150-200 meters above the crater, generating fallout in the vicinity of the crater and to the main barrancas.

Small ash falls are reported in the leeward areas.

Fuego - eruptive plume from 05.12.2018 - photo Conred

Fuego - eruptive plume from 05.12.2018 - photo Conred

At Pacaya, strombolian activity is characterized by explosions with ejections 25-50 meters above the crater falling around the Mackenney cone, which feed a bifid lava flow towards Cerro Chino, which reaches about 200 meters.

 

Source: Insivumeh

 Pacaya - Strombolian activity : ash plume and lava flow - photo Claudia Ruppitsch / Instagram 04.12.2018

 Pacaya - Strombolian activity : ash plume and lava flow - photo Claudia Ruppitsch / Instagram 04.12.2018

Lire la suite

Publié le par Bernard Duyck
Publié dans : #volcanic activity
 Kilauea East rift zone - aligned cones degassing, in Leilani Estates- photo Extreme Exposure 20.11.2018

Kilauea East rift zone - aligned cones degassing, in Leilani Estates- photo Extreme Exposure 20.11.2018

In Kilauea, no more active lava observations since September 4th ... on the basis of the dritères of the Global Volcanism Program, the eruption on the Lower East Rift Zone can be considered to be over.

Kilauea remains an active volcano, and geophysical data continues to show movements in the magmatic system, including a recharge of the East Rift Zone.

The danger remains, the area under effective control, and the closing of the lava field and vents, and its prohibition of access, remain in force, except with the express authorization of the Civil Defense.

For now, the volcanic alert level is Adisory and the yellow aviation code.

 

Source: HVO

Kilauea East rift zone - measurement of gas emissions by a drone near the cone on fissure 21 - Doc. USGS

Kilauea East rift zone - measurement of gas emissions by a drone near the cone on fissure 21 - Doc. USGS

At Etna, a Strombolian activity coupled with the emission of a small lava flow by the NSEC "puttusiddu" continues modestly; a small cone has formed inside the mouth.

Sources: Boris Behncke, Salvo Virzi and Gio Giusa

Etna - Strombolian activity of the NSEC puttusiddu 03.12.2018 - photo Salvo Virzi

Etna - Strombolian activity of the NSEC puttusiddu 03.12.2018 - photo Salvo Virzi

Etna - the intracratic cone on the NSEC flank and the lava flow 04.12.2018 - photo Gio Giusa

Etna - the intracratic cone on the NSEC flank and the lava flow 04.12.2018 - photo Gio Giusa

Etna - the intracratic cone on the NSEC flank and the lava flow 05.12.2018 - photo Gio Giusa

Etna - the intracratic cone on the NSEC flank and the lava flow 05.12.2018 - photo Gio Giusa

The dome of Merapi, in continuous growth, presents on the images of Planet Labs of December 1 an intriguing vent or a collapse structure under its perimeter.

These images were not commented by the PVMBG, which informs a seismicity characterized this December 4 by 50 earthquakes of eruption, one earthquake of emission, 5 earthquakes of low frequency, 8 hybrid earthquakes, a shallow volcanic earthquake and 2 distant tectonic earthquakes. The dome is surmounted by a white degassing at 50 meters above the summit.

 

Sources: PVMBG & Planet Labs / via Simon Carn

Merapi - a strange dark area under the dome ... vent or collapse feature - photo Planet LAbs / via Simon Carn

Merapi - a strange dark area under the dome ... vent or collapse feature - photo Planet LAbs / via Simon Carn

The rest of the volcanic news is summarized on the Volcanodiscovery map below.

Volcanoes in activity on 04.12.2018 - Doc. VolcanoDiscovery

Volcanoes in activity on 04.12.2018 - Doc. VolcanoDiscovery

Lire la suite

Publié le par Bernard Duyck
Publié dans : #volcanic activity
Turrialba - 03.12.2018 / 12h05-12h10 - photo from the summit of the volcano by Jean Paul Calvo and Luis Fernando Brenes / RSN

Turrialba - 03.12.2018 / 12h05-12h10 - photo from the summit of the volcano by Jean Paul Calvo and Luis Fernando Brenes / RSN

An eruption, energetic but of low amplitude, occurred on December 3 from 12:05 in Turrialba, accompanied by a plume of ash that rose 500 meters above the crater.

At the time of the episode, two RSN officials were close to the active crater engaged in maintenance work, and were able to take pictures from an unusual point of view.

 

Sources: RSN & Ovsicori

The snowy eastern flank of Chiles seen from Tulcán - photo 28.06.2014, B. Bernard / IGEPN

The snowy eastern flank of Chiles seen from Tulcán - photo 28.06.2014, B. Bernard / IGEPN

The observatory Pasto / IGEPN recorded this December 3 from 1am. local time a new swarm of volcano-tectonic earthquakes at the Chiles-Cerro Negro of Mayasquer complex, located on the border between Ecuador and Colombia. It is characterized by an average of 100 earthquakes per hour, with a MLv magnitude of 2.4 for the strongest.

The volcano, which last erupted in 1936, has a reduced activity with the presence of seismic activity and of hot springs and solfataras.

 

Source: IGEPN Pasto

Complex Chiles-Cerro Negro Mayasquer - seismic swarm of 03.12.2018 / from 01h local - Doc.IGEPN

Complex Chiles-Cerro Negro Mayasquer - seismic swarm of 03.12.2018 / from 01h local - Doc.IGEPN

No notable change in Fuego activity, characterized by 5 to 8 moderate explosions per hour, accompanied by light gray plumes at 4,300 m asl. dispersing to a western sector, and ash falls on leeward villages.

The ejections of incandescent materials 150-200 m above the crater generate moderate to strong avalanches in its surroundings, and are accompanied by shock waves.

Photos on Planet shows an enlargement of the diameter of the summit crater following volcanic activity, between November 20th and 30th.

 

Sources: Insivumeh & Conred

 Fuego - 03.12.2018 - Insivumeh photo

Fuego - 03.12.2018 - Insivumeh photo

Fuego - evolution of the summit crater between 20 and 30 November 2018 - Doc. Planet
Fuego - evolution of the summit crater between 20 and 30 November 2018 - Doc. Planet

Fuego - evolution of the summit crater between 20 and 30 November 2018 - Doc. Planet

At Sabancaya, volcanic activity between 26 November and 2 December is considered moderate, with an average of 21 explosions per day, accompanied by plumes of gas and ash at 2,500 meters maximum above the summit, dispersing over 30 km .

Seismicity is characterized by LP earthquakes, associated with internal fluid movements, and hybrid earthquakes, associated with the rise of magma.

The flow of sulfur dioxide remains significant, with 4,600 tons / day, recorded on November 28th. Slight inflation is reported, as well as small thermal anomalies between 2 and 19 MW.

The alert level remains in Naranja.

 

Sources: IG Peru, OVI, Ingemmet

Sabancaya - summary of the activity between 26.11 and 02.12.2018 - Doc.IG Peru, OVI, Ingemmet

Sabancaya - summary of the activity between 26.11 and 02.12.2018 - Doc.IG Peru, OVI, Ingemmet

Lire la suite

Archives

Articles récents

Hébergé par Overblog