December 27, 2021. EN . Iceland : Reykjanes Peninsula , La Reunion Island : Piton de la Fournaise , Vanuatu Archipelago : Yasur , Ecuador : Sangay , Spain : Tenerife .

December 27 , 2021.



Iceland , Reykjanes Peninsula :

Update on the earthquake swarm in Geldingadalir , Update on 26.12. at 15:20

The earthquake swarm that started on 21st of December near Fagradalsfjall has continued over the Christmas holidays. Around 3000 earthquakes have been detected every day since the swarm started. Most of the activity is near Fagradalsfjall volcano but earthquakes have also been detected near the town of Grindavík and lake Kleifarvatn.

The earthquakes near Grindavík and Kleifarvatn are interpreted as triggered earthquakes due to increased pressure caused by a dike intrusion near Fagradalsfjall. On Christmas eve three earthquakes above M4 were detected near Grindavík, the largest one M4.8. There are no signs of magmatic intrusions in other places than by Fagradalsfjall. The earthquake activity by Fagradalsfjall is episodic with periods of very intense earthquake activity.

Latest InSAR images show clear signs of deformation over the period from 20 to 26 December. The deformation seen now is very similar to deformation observed in the end of February this year when a dike intrusion was starting near Fagradalsfjall. This InSAR data supports data from GPS measurements showing deformation in the same area.

At 15:25 an M3.9 earthquake occurred and a minute late another M3.6 earthquake was detected. Both of them were located 3 km W of Lake Kleifarvatn.This morning at around 05:10, four earthquakes were detected of magnitude 3 or larger in similar location. These earthquakes are interpreted as triggered earthquakes due to increased pressure caused by a dike intrusion near Fagradalsfjal.

Source : Vedur is.

Photos : IMO.


La Réunion Island , Piton de la Fournaise :

Press release of December 27, 2021 – 10:15 a.m.

The eruption that began on December 22, 2021 at around 3:30 a.m. local time continues. Over the last 24 hours the amplitude of the eruptive tremor (indicator of an emission of lava on the surface) still shows fluctuations. These fluctuations can be linked either to:
– the cone under construction which undergoes construction and dismantling phases, thus influencing the speed of the lava flows at the level of the vent;
– or to punctual releases of pockets of gas trapped in the supply ducts which can be released suddenly leading to an increase in the tremor.
The amplitude of the tremor is this morning at about 30% of its initial amplitude.

The lava tunnel activity set up at the foot of the cone since December 23, 2021, thanks to the closure of the cone, continues, with occasional resurgences of flows. Following
resurgences observed yesterday, a second mouth was visible at the foot of the cone this morning. The main flow does not emerge in a single channel until about a hundred meters downstream.
Lava fountain activity within the cone is low, and lava fountains exceed the height of the cone (<15m) only intermittently.
Interferometric data from satellite acquisitions on December 25 and 26, and processed by the ISDeform observation service, confirm that the surface deformations associated with
the magma injection on December 22 is decimetric and extends from the summit area to the eruptive site. The area between the southern edge of the Dolomieu crater and the Château Fort crater has thus deformed by around twenty centimeters. No significant deformation beyond the eruptive site is observed. These data agree with the data from the permanent GPS stations of the OVPF-IPGP.

Interferogram representing the deformations at Piton de la Fournaise associated with the eruption of December 22, 2021. In addition to measurements on the ground, a satellite technique called dInSAR also makes it possible to monitor the building’s inflation / deflation cycles associated with movements. magma in depth. To do this, the satellite “illuminates” an area of the ground with an electromagnetic wave and collects the signal reflected from the ground. Comparison of two measurements of this type of the same surface taken at different times allows the deformation of the surface to be imaged. Each complete color cycle (from red to blue) of the interferogram corresponds to 27.8 mm of surface displacement towards (positive) or away (negative) of the satellite (© ISDeform).

Over the last 24 hours:
– A single volcano-tectonic earthquake under the summit was recorded.
– Surface deformations no longer show significant deformation.
– The lava flow estimates, established by satellite method with the HOTVOLC platform (OPGC – Clermont Auvergne University), are between 3 and 12 m3 / sec. These variations can be explained by the method, which is based on the infrared radiation of the flow, the perception of which by the satellites can be largely influenced by the weather conditions at above the flows.
– The front of the flow, in graton, currently on a relatively flat area, moves only very slowly. The flow front advanced less than 100 meters between December 24 and 26.

Alert level: Alert 2-1 (eruption in the Enclos ).

Source : OVPF/IPGP.


Vanuatu Archipelago , Yasur :

19°32’0”S 169°26’30”E
Summit 1184ft (361m)
Current Volcano Alert Level: Level 2

Yasur volcano activity is continuing in the level of major unrest state. The Volcanic Alert Level remains at Level 2.

New observations on the ground suggest that the Yasur volcanic activity continues to produce loud explosions with emission of steam and ash including volcanic bombs that fall inside the crater. With this current activity and ongoing presence of volcanic gases and/or volcanic ash around the summit crater, the danger zone is now at 600 meter around the volcanic cone.

Analysis of the latest Yasur seismic data from the volcano monitoring system confirms that Yasur volcano activity is continuing in the major unrest level. The activity consists of ongoing explosions with gas plumes and/or volcanic ash. Some explosions remain intensified and volcanic projectiles or bombs may fall in and/or around the summit crater.

The Yasur Volcanic Alert Level (VAL) has remained in Level 2 since the 18th October 2016. The current observations are consistent with the activity of the Volcanic Alert Level 2. Level 2 indicates ‘Major level of unrest; Danger zone is reduced to 600 m around the volcanic cone. With this current volcanic activity, it is a useful reminder that eruptions can occur with little or no warning.

Source et photos : Geohazard.


Ecuador , Sangay :


Surface activity level: High, Surface trend: Ascending.
Internal activity level: High, Internal trend: Ascending.

Seismicity: From December 25, 2021, 11:00 a.m. to December 26, 2021, 11:00 a.m .:

Long period type events (LP) 56
Explosions (EXP) 117
Emission Tremors (TREMI) 15

Rains / Lahars:
No rain was recorded. ** In the event of heavy rains, they could re-mobilize the material accumulated in the gullies, generating mudslides and debris that would descend through the drains of the volcano and flow into adjacent rivers. **

Emission / ash column:
Low ash load gas emissions have been observed with heights of up to 1000 meters above crater level in a south-easterly direction. 3 VAAC ash emission alerts were recorded with directions to the South and Southeast, with altitudes of up to 1170 meters above crater level. There are no reports of ash fall at the national level.

Other monitoring parameters:
The MIROVA satellite recorded 2 high thermal alerts, of 756 and 438 MW during the last 24 hours. The FIRMS satellite records 58 thermal alerts in the last 24 hours.

In the afternoon of yesterday, members of the network of volcanic observers (ROVE) near the city of Macas (province of Morona Santiago), reported noises coming from the Sangay volcano. These noises are perceptible by the presence of clouds and south-easterly winds. On the other hand, the seismic records show a slight increase in the intensity of the explosions in the last hours, however, these events are associated with the high levels, characteristic of the activity of the volcano. For the moment, the volcano sector is cloudy.

Alert level: yellow.

Source et photo : IG-EPN.


Spain , Tenerife :

Today we must also look at Tenerife, where there has been an ongoing seismic swarm for almost 5 years in the region of Adeje – Vilaflor with a seismic localization at about 5 to 8 km deep and that during of the last 5 days. Also, there are constraints around a seismic axis in the North-North-East-South-South-West direction which cause it to move seismically and, hopefully, will not last long, because if a path is cut in rock, magma will begin to move along this path.

Today’s earthquake at Icod de Vinos of M 1.1 at 9 km is very interesting since we also had another one of M 1.1 at 10 km on September 27 in an area that made a lot of talk in April – May 2004 (an eruption was expected in October 2004) and hopefully it stays calm, but every time it moves it’s dangerous. This area is also aligned with the Caldera area, the Adeje swarm and even a 2.7 earthquake in the south, denoting very clear regional efforts.

But the problem is neither the Icod de los Vinos earthquakes nor the Adeje earthquakes, the biggest problem is that this activity affects to some extent what is below the central Teide building / Pico Viejo in the center of the island of Tenerife. More precisely, it is necessary to refer to the phonolitic magmatic chamber which is located between 12 and 15 km under the caldera of Las Cañadas del Teide. The 2004 intrusion ended there, the 2016 intrusion in Adeje and subsequent ones also affect the magma chamber in one way or another, so the system is more complex than it looks.

Sources : Volcanes y Ciencia Hoy ( Henrique) , Involcan.

Photos : , Involcan.


December 19, 2021. EN. Spain : Tenerife , Spain / La Palma : Cumbre Vieja , Indonesia : Semeru , Chile : Villarica , Costa Rica : Turrialba / Poas , La Martinique : Montagne Pelée .

December 19 , 2021.



Spain , Tenerife :


These days, it was almost a monograph of La Palma. But Tenerife for several days shows seismic activity at around 6-8 km in the Adeje area and around 8-11 km in the Caldera and Guia de Isora area. The IGN, located around 11 in the region in 15 days. But when we remove this swarm, it turns out that in 14 days there were 59 located by Involcan in the same areas.
This is not new, it is an activity that started 5 years ago There had already been stronger swarms in this area, in October 2016, November 2017, November 2018, July 2019, December 2020 and more … we arrive at 2004. Seismicity has been located in the area since the 1980s.

The large triangular island of Tenerife is composed of a complex of overlapping Miocene-to-Quaternary stratovolcanoes that have remained active into historical time. The NE-trending Cordillera Dorsal volcanic massif joins the Las Cañadas volcano on the SW side of Tenerife with older volcanoes, creating the largest volcanic complex of the Canary Islands. Controversy surrounds the formation of the dramatic 10 x 17 km Las Cañadas caldera, which is partially filled by Teide stratovolcano, the highest peak in the Atlantic Ocean. The origin of the caldera has been variably considered to be due to collapse following multiple major explosive eruptions or as a result of a massive landslide (in a manner similar to the earlier formation of the massive La Orotava and Guimar valleys), or a combination of the two processes. The most recent stage of activity beginning in the late Pleistocene included the construction of the Pico Viejo and Teide edifices. Tenerife was perhaps observed in eruption by Christopher Columbus, and several flank vents on the Canary Island’s most active volcano have been active during historical time.


Teide volcano, the highest point on the island of Tenerife, towers above the scarp of the massive Orotava landslide, which occurred about 600,000 years ago. The light-colored area on the eastern foot of the volcano (left) is covered by tephra deposits from the Plinian Montana Blanca eruption about 2,000 years ago. Teide was constructed within the 10 x 16 km wide Las Cañadas caldera on the SW side of Tenerife. The large triangular island is composed of a complex of overlapping stratovolcanoes that have remained active into historical time.

It turns out that the central volcano of Tenerife is very large, the third largest on the planet by volume. While the Teide-Pico Viejo volcanic complex also erupts, these are not always basaltic eruptions. , the majority in this area are phonolitic, much more explosive and of course more powerful than that experienced in La Palma.
And let’s not forget, it is active too and where the phonolitic reservoir is located under the caldera, could indicate deep contributions.

Sources : GVP ,  Volcanes y Ciencia Hoy .

Photo : , Alexander Belousov, 2001 (Institute of Volcanology, Kamchatka, Russia).


Spain / La Palma , Cumbre Vieja :

December 18, 2021 09:00 UTC Volcanic monitoring continues in La Palma.

Since the last declaration a total of 40 earthquakes have been located on the island of La Palma, none of these earthquakes have been felt by the population.
The maximum recorded magnitude is 2.8 (mbLg), corresponding to yesterday’s earthquakes at 11:31 and 14:54 UTC, at a depth of 33 and 14 km, respectively. The minimum magnitude of localized seismicity was 0.9 mbLg.
Localized seismicity continues below the central area of Cumbre Vieja in the same areas as the previous days. The earthquakes mainly fall into two groups, 22 of the earthquakes are between 7 and 16 km deep and 15 earthquakes at depths greater than 30 km. Likewise, 3 shallow earthquakes were located in the area, with a depth of less than 4 km.

During the past 24 hours, no volcanic tremor has been observed in the records, keeping the seismic noise at levels close to the pre-eruptive period.
Since the cessation of the volcanic tremor signal on December 13 at 10:20 p.m., events of the low frequency (LP) type have continued to be detected in addition to localized volcano-tectonic earthquakes.
The island’s network of permanent GNSS stations does not show significant deformations that could be associated with volcanic activity.

In view of the image calibrated at 08:45 UTC, no type of emission is visible.
The height of the cone is measured by obtaining a value of 1122 m at sea level.

The eruptive process continues to show signs of exhaustion and the visible emission of volcanic gases is punctual and sporadic and is concentrated in the eruptive centers and offshoots of the volcanic tubes.

The scientific committee monitoring the eruption in Cumbre Vieja, La Palma, on Friday detected « a small flow » of lava on the surface on the flows that fall in the area of the cliff of Las Hoyas, although the « signs of depletion ”of the volcano persist. Its spokesperson, María José Blanco, indicated this Saturday after the meeting of the Volcanic Emergency Plan of the Canary Islands (Pevolca) that this « small lava flow » corresponds to « a vestige » which comes from a still volcanic tube active.

However, he stressed that in the absence of observable phenomena on the surface and those of the surveillance system « the signs of exhaustion are corroborated », without ruling out a rebound in Strombolian activity and the emission of flows.

Sources : IGN es , El Pais .

Photo : I love the world . Involcan .


Indonesia , Semeru :


Issued : Décember 18 , 2021
Volcano : Semeru (263300)
Current Aviation Colour Code : ORANGE
Previous Aviation Colour Code : orange
Source : Semeru Volcano Observatory
Notice Number : 2021SMR85
Volcano Location : S 08 deg 06 min 29 sec E 112 deg 55 min 12 sec
Area : East java, Indonesia
Summit Elevation : 11763 FT (3676 M)

Volcanic Activity Summary :
Pyroclastic flow occured from the edge of lava deposit at 22h31 UTC ( 05h31 local )

Volcanic Cloud Height :
Ash-cloud is not visible

Other Volcanic Cloud Information :
Ash-cloud moving to South West

Remarks :
Lava flow is observed through the Southeast direction of the Semeru summit crater.

Clear to misty volcano. No smoke from the crater was observed.
It was observed 2 hot cloud avalanches with a sliding distance of 500 meters in the direction of Besuk Kobokan, as well as an emission of gray / white smoke with a height of 200 meters above the summit in a southwest direction. .

Seismicity is linked to the activity of magma as well as to tectonic activity.
– 2 hot cloud avalanches
– 5 avalanche earthquakes
– 12 earthquakes of emissions
– 3 deep volcanic earthquakes
– 8 distant tectonic earthquakes

Sources : Magma Indonésie , PVMBG.

Photo : Oystein Lund Andersen.


Chile , Villarica :

Special Report on Volcanic Activity (REAV), La Araucanía region, Villarrica volcano, December 17, 2020, 5:50 p.m. local time (Continental Chile)

The National Service of Geology and Mining of Chile (Sernageomin), on the basis of information obtained through the monitoring equipment of the National Volcanic Monitoring Network (RNVV), processed and analyzed in the Volcanic Observatory of the Southern Andes (Ovdas), and in relation to the activity of the Villarrica volcano, reports the following:

On Thursday, December 17, at 5:16 p.m. local time (8:16 p.m. UTC), IP cameras installed near the volcano recorded a pulse of particulate matter, associated with a long-period (LP) type earthquake.



The data obtained are as follows:
MAXIMUM HEIGHT OF THE COLUMN: 720 m with particle emission.

Remarks :
At the time of publication of this report, the monitoring parameters do not show significant variations.

The volcanic alert remains at the level: Yellow.

Source : Sernageomin.

Photo : Volcanologia en Chile ( archive).


Costa Rica , Turrialba / Poas :

Turrialba volcano:

No eruption is reported.
Seismic activity is higher than yesterday.
At the time of this report, the winds are blowing from the southwest.

Significant degassing is observed in the main crater. The CO2 / SO2, H2S / SO2 gas ratios and the SO2 concentration are relatively stable: 19.9; 0.85 and 6.47 ppm, respectively. The volcanic deformation of the building is not significant.

Poas volcano:

No eruption is reported.
Seismic activity is similar, compared to yesterday.
At the time of this report, the winds are blowing from the southwest.

Due to the high cloud cover, it is not possible to make observations in the main crater. Both the H2S / SO2 ratio and the SO2 concentration remain relatively stable: 0.75 and 1.59 ppm; respectively. The SO2 concentration at the watchtower this morning was less than 1 ppm. There is no significant deformation of the volcanic building.

Source : Ovsicori.

Photos : Jean Paul Calvo /RSN , Ovsicori.


La Martinique , Montagne Pelée : 

Weekly report on the activity of Mount Pelée for the period from December 10 to 17, 2021.

Between December 10, 2021 at 4 p.m. (UTC) and December 17, 2021 at 4 p.m. (UTC), the OVSM recorded at least 27 volcano-tectonic earthquakes of magnitude less than or equal to 0.9 and located at l inside the volcanic edifice between 2.5 and 0.5 km deep below the surface. This volcano-tectonic-type superficial seismicity is associated with the formation of micro-fractures in the volcanic edifice. None of these earthquakes were felt by the population.


The shallow sea degassing zone between St Pierre and le Prêcheur is still observed. The IGP took fluid samples in order to understand the origin of this degassing and to assess its possible relationship with the hydrothermal system of Mount Pelée.

The vegetation grows back at the level of the main zone of degraded vegetation which is observed on the southwest flank of Mount Pelée, between the upper Claire river and the Chaude river. However, new areas of deteriorated and dead vegetation were detected by analysis of satellite images in the upper Claire River and near the hot springs.

The alert level remains YELLOW: vigilance.

Source : Direction de l’OVSM IPGP.

Photo : Jmp48 / Wikipedia

19 Décembre 2021. FR. Espagne : Tenerife , Espagne / La Palma : Cumbre Vieja , Indonésie : Semeru , Chili : Villarica , Costa Rica : Turrialba / Poas , La Martinique : Montagne Pelée .

19 Décembre 2021.



Espagne , Tenerife :


Ces jours-ci, c’était presque une monographie de La Palma. Mais Tenerife depuis plusieurs jours montre une activité sismique à environ 6-8 km dans la région d’Adeje et à environ 8-11 km dans la région de la Caldera et Guia de Isora. L’IGN, a localisé environ 11 évènements dans la région en 15 jours. Mais lorsque on retire cet essaim, il s’avère qu’en 14 jours il y en a eu 59 localisés par Involcan dans les mêmes zones.
Ce n’est pas nouveau, c’est une activité qui a commencé il y a 5 ans Il y avait déjà eu des essaims plus forts dans cette zone, en octobre 2016 , novembre 2017, novembre 2018, juillet 2019, décembre 2020 et plus… on arrive à 2004. Une sismicité a été localisées dans la zone depuis les années 80.

La grande île triangulaire de Tenerife est composée d’un complexe de stratovolcans qui se chevauchent , datant du Miocène au Quaternaire et qui sont restés actifs dans l’histoire. Le massif volcanique de la Cordillera Dorsal à orientation Nord-Est rejoint le volcan Las Cañadas du côté Sud-Ouest de Tenerife avec des volcans plus anciens, créant le plus grand complexe volcanique des îles Canaries. Une controverse entoure la formation de la spectaculaire caldeira de 10 x 17 km de Las Cañadas, qui est partiellement remplie par le stratovolcan du Teide, le plus haut sommet de l’océan Atlantique. L’origine de la caldeira a été diversement considérée comme étant due à un effondrement à la suite de plusieurs éruptions explosives majeures ou à la suite d’un glissement de terrain massif (d’une manière similaire à la formation antérieure des vallées massives de La Orotava et Guimar), ou une combinaison des deux processus. L’étape la plus récente de l’activité commençant à la fin du Pléistocène comprenait la construction des édifices du Pico Viejo et du Teide. Ténérife a peut-être été observé en éruption par Christophe Colomb, et plusieurs évents latéraux sur le volcan le plus actif des îles Canaries ont été actifs au cours de l’histoire.


Le volcan Teide, le point culminant de l’île de Tenerife, domine l’escarpement du glissement de terrain massif d’Orotava, qui s’est produit il y a environ 600 000 ans. La zone de couleur claire sur le pied oriental du volcan (à gauche) est recouverte de dépôts de téphra provenant de l’éruption plinienne du Montana Blanca il y a environ 2 000 ans. Le Teide a été construit dans la caldeira de Las Cañadas, large de 10 x 16 km, du côté Sud-Ouest de Tenerife. La grande île triangulaire est composée d’un complexe de stratovolcans superposés qui sont restés actifs dans l’histoire.

Il s’avère que le volcan central de Tenerife est très grand, le troisième plus grand de la planète en volume. Si le complexe volcanique Teide-Pico Viejo entre également en éruption , ce ne sont pas toujours des éruptions basaltiques. , la majorité dans cette zone sont phonolitiques, beaucoup plus explosives et bien sûr plus puissantes que celle vécue à La Palma.
Et ne l’oublions pas, il est actif aussi et là où se trouve le réservoir phonolitique sous la caldeira, pourrait indiquer des contributions profondes.

Sources : GVP ,  Volcanes y Ciencia Hoy .

Photo : , Alexander Belousov, 2001 (Institute of Volcanology, Kamchatka, Russia).


Espagne / La Palma , Cumbre Vieja :

18Décembre 2021 09:00 UTC La surveillance volcanique se poursuit à La Palma.

Depuis la dernière déclaration, un total de 40 tremblements de terre ont été localisés sur l’île de La Palma, aucun de ces tremblements de terre n’a été ressenti par la population.
La magnitude maximale enregistrée est de 2,8 (mbLg), correspondant aux séismes d’hier à 11h31 et 14h54 UTC, à une profondeur de 33 et 14 km, respectivement. La magnitude minimale de sismicité localisé était de 0,9 mbLg.
La sismicité localisée se poursuit sous la zone centrale de Cumbre Vieja dans les mêmes zones que les jours précédents. Les séismes se divisent principalement en deux groupes, 22 des séismes se situent entre 7 et 16 km de profondeur et 15 séismes à des profondeurs supérieures à 30 km. De même, 3 séismes peu profonds ont été localisés dans la zone, avec une profondeur de moins de 4 km.

Au cours des dernières 24 heures, aucun trémor volcanique n’a été observé dans les enregistrements, maintenant le bruit sismique à des niveaux proches de la période pré-éruptive.
Depuis l’arrêt du signal de tremor volcanique le 13 décembre à 22h20, des événements de type basse fréquence (LP) ont continué à être détectés en plus des séismes volcano-tectoniques localisés.
Le réseau de stations GNSS permanentes de l’île ne montre pas de déformations significatives qui pourraient être associées à l’activité volcanique.

Au vu de l’image calibrée à 08:45 UTC, aucun type d’émission n’est visible.
La hauteur du cône est mesurée en obtenant une valeur de 1 122 m sur le niveau de la mer.

Le processus éruptif continue de montrer des signes d’épuisement et l’émission visible de gaz volcaniques est ponctuelle et sporadique et est concentrée dans les centres éruptifs et les ramifications des tubes volcaniques. 

Le comité scientifique qui surveille l’éruption de Cumbre Vieja, La Palma, a détecté vendredi « une petite coulée » de lave à la surface sur les coulées qui decendent dans la zone de la falaise de Las Hoyas, bien que les « signes d’épuisement » du volcan persistent. Sa porte-parole, María José Blanco, a indiqué ce samedi après la réunion du Plan d’Urgence Volcanique des Îles Canaries (Pevolca) que cette « petite coulée de lave » correspond à « un vestige » qui provient d’un tube volcanique encore actif.

Cependant, il a été souligné qu’en l’absence de phénomènes observables à la surface et ceux du système de surveillance « les signes d’épuisement sont corroborés », sans exclure un rebond de l’activité strombolienne et l’émission de coulées.

Sources : IGN es , El Pais .

Photos : I love the world , Involcan .


Indonésie , Semeru :


Émis : 18 décembre 2021
Volcan : Semeru (263300)
Code Couleur Aviation Actuel : ORANGE
Code Couleur Aviation précédent : orange
Source : Observatoire du volcan Semeru
Numéro d’avis : 2021SMR85
Emplacement du volcan : S 08 deg 06 min 29 sec E 112 deg 55 min 12 sec
Région : Java oriental, Indonésie
Élévation du sommet : 11763 FT (3676 M)

Résumé de l’activité volcanique :
Une coulée pyroclastique s’est produite depuis le bord du dépôt de lave à 22h31 UTC ( 05h31 locale ).

Hauteur des nuages volcaniques :
Le nuage de cendres n’est pas visible

Autres informations sur les nuages volcaniques :
Nuage de cendres se déplaçant vers le Sud-Ouest

Remarques :
Une coulée de lave est observée dans la direction Sud-Est depuis le cratère sommital du Semeru.

Volcan clair à brumeux. Aucune fumée issue du cratère n’a été observée.
Il a été observé 2 avalanches de nuages ​​chauds avec une distance de glissement de 500 mètres en direction de Besuk Kobokan, ainsi qu’une émission de fumée grise / blanche avec une hauteur de 200 mètres au dessus du sommet en direction Sud-Ouest.

La sismicité est liée à l’activité du magma ainsi qu’à l’activité tectonique.
– 2 avalanches de nuages ​​chauds
– 5  tremblements de terre d’avalanches
– 12  tremblements de terre d’émissions
– 3 tremblements de terre volcaniques profonds
– 8 tremblements de terre tectoniques lointains

Sources : Magma Indonésie , PVMBG.

Photo : Oystein Lund Andersen.


Chili , Villarica :

Rapport spécial sur l’activité volcanique (REAV), région de La Araucanía, volcan Villarrica, 17 décembre 2020, 17h50 heure locale (Chili continental)

Le Service national de géologie et d’exploitation minière du Chili (Sernageomin), sur la base des informations obtenues grâce à l’équipement de surveillance du Réseau national de surveillance volcanique (RNVV), traitées et analysées dans l’Observatoire volcanique des Andes méridionales (Ovdas), et en relation avec l’activité du volcan Villarrica, rapporte ce qui suit :

Le jeudi 17 décembre, à 17h16 heure locale (20h16 UTC), les caméras IP installées à proximité du volcan, ont enregistré une impulsion de matière particulaire, associée à un séisme de type longue période (LP).



Les données obtenues sont les suivantes :
HAUTEUR MAXIMALE DE LA COLONNE : 720 m avec émission de particules.

Remarques :
Au moment de la publication de ce rapport, les paramètres de surveillance ne présentent pas de variations significatives.

L’alerte volcanique reste au niveau : Jaune.

Source : Sernageomin.

Photo : Volcanologia en Chile ( archive).


Costa Rica , Turrialba / Poas :

Volcan Turrialba :

Aucune éruption n’est signalée.
L’activité sismique est plus élevée qu’hier.
Au moment de ce rapport, les vents soufflent au Sud-Ouest.

Un dégazage important est observé dans le cratère principal. Les ratios de gaz  CO2/SO2, H2S/SO2 et la concentration de SO2 sont relativement stables : 19,9 ; 0,85 et 6,47 ppm, respectivement. La déformation volcanique du bâtiment n’est pas significative.

Volcan Poas :

Aucune éruption n’est signalée.
L’activité sismique est similaire, par rapport à hier.
Au moment de ce rapport, les vents soufflent au Sud-Ouest.

En raison de la couverture nuageuse élevée, il n’est pas possible de faire des observations dans le cratère principal. Tant le rapport H2S/SO2 que la concentration en SO2 restent relativement stables : 0,75 et 1,59 ppm ; respectivement. La concentration de SO2 au mirador ce matin était inférieure à 1 ppm. Il n’y a pas de déformation significative du bâtiment volcanique.

Source : Ovsicori.

Photos : Jean Paul Calvo /RSN , Ovsicori.


La Martinique , Montagne Pelée : 

Bilan hebdomadaire de l’activité de la Montagne Pelée pour la période du 10 au 17 Décembre 2021 .

Entre le 10 Décembre 2021 à 16 heures (UTC) et le 17 Décembre 2021 à 16 heures (UTC), l’OVSM a enregistré au moins 27 séismes de type volcano-tectonique de magnitude inférieure ou égale à 0,9 et localisés à l’intérieur de l’édifice volcanique entre 2,5 et 0,5 km de profondeur sous la surface. Cette sismicité superficielle de type volcano-tectonique est associée à la formation de micro-fractures dans l’édifice volcanique. Aucun de ces séismes n’a été ressenti par la population .


La zone de dégazage en mer à faible profondeur entre St Pierre et le Prêcheur est toujours observée. L’IGP a procédé à des prélèvements de fluides afin de comprendre l’origine de ce dégazage et d’évaluer sa relation éventuelle avec le système hydrothermal de la Montagne Pelée. 

La végétation repousse au niveau de la zone principale de végétation dégradée qui est observée sur le flanc Sud-Ouest de la Montagne Pelée, entre la haute rivière Claire et la rivière Chaude. Cependant , de nouvelles zones de végétation détériorées et mortes ont été détectées par analyse d’images de satellites dans haute rivière Claire et à proximité des sources Chaudes.

Le niveau d’alerte reste JAUNE : vigilance.

Source : Direction de l’OVSM IPGP.

Photo : Jmp48 / Wikipedia