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Earth of fire

Actualité volcanique, Articles de fond sur étude de volcan, tectonique, récits et photos de voyage

Publié le par Bernard Duyck
Publié dans : #volcanic activity

The eruption started on 19.09.022 around 7:48 a.m. local time at Piton de La Fournaise continues.

With the decrease in activity in the lava fountain and the focusing of the activity, the amplitude of the eruptive tremor (indicator of an emission of lava on the surface) decreased sharply during the day yesterday, and s has stabilized since 11 p.m. yesterday evening (UTC time, 03 a.m.) at about 15% of its initial amplitude.

Piton de La Fournaise - Evolution of the RSAM (indicator of a surface lava emission) since 09/19/2022 00:00 UTC time (04:00 local time) on the RVA seismological station located at the level of the Rivals crater (© OVPF/IPGP ).

Piton de La Fournaise - Evolution of the RSAM (indicator of a surface lava emission) since 09/19/2022 00:00 UTC time (04:00 local time) on the RVA seismological station located at the level of the Rivals crater (© OVPF/IPGP ).

Piton de La Fournaise - Flow of SO2 in the air detected by the DOAS method at the "Enclos0" station over the last 365 days (© OVPF-IPGP). As of 20.09.2022 - 04:03

Piton de La Fournaise - Flow of SO2 in the air detected by the DOAS method at the "Enclos0" station over the last 365 days (© OVPF-IPGP). As of 20.09.2022 - 04:03

Seismicity under the summit area is down with 24 volcano-tectonic earthquakes recorded over the past 24 hours. Thanks to some thinning at the end of the day yesterday: - lava flow estimates were established by satellite method on the HOTVOLC platform (OPGC - Clermont Auvergne University), with peaks at 28 m3 / sec, - the images OVPF-IPGP webcams showed lava fountaining activity focusing on the lowest part of the fissure system that opened up yesterday.

The OVPF-IPGP NOVAC station located on the western rampart of the Enclosure detected the gas plume linked to the eruption with SO2 fluxes close to or even slightly higher than those of the last eruption (December 22, 2021- January 17, 2022) with a maximum peak estimated at 8000 tons per day (8 kton). In parallel, the passage of the TROPOMI satellite around 10:10 a.m. (UTC time, 2:10 p.m. local time) indicated an emission of 2.054 kton of SO2 since the start of the eruption (i.e. in just under 6:30 a.m. of eruption).

Piton de La Fournaise - improved SO2 signal of 3.11DU at a distance of 10.4km from PitondelaFournaise - Sentinel-5P image 20.09.2022 - Doc. Tropomi / DLR / BIRA / ESA

Piton de La Fournaise - improved SO2 signal of 3.11DU at a distance of 10.4km from PitondelaFournaise - Sentinel-5P image 20.09.2022 - Doc. Tropomi / DLR / BIRA / ESA

Due to the very bad weather conditions on site, no on-site reconnaissance could be carried out by the OVPF-IPGP teams, whether on foot or by air.

Alert level: Alert 2-1 (eruption in the Enclosure without any particular threat to the safety of people, property or the environment)

 

Sources: OVPF - Press release – 09/20/2022 – 3:30 p.m. (local time) – 11:30 a.m. (UTC time) & Sentinel-5P Tropomi

Find all the information relating to the activity of Piton de la Fournaise on the various OVPF-IPGP media: - the website: ipgp.fr/fr/ovpf/actualites-ovpf - the Twitter account: twitter. com/obsfournaise - the Facebook account: facebook.com/ObsVolcanoPitonFournaise

Sabancaya - Activity from 09 to 18.09.2022 - Doc. I.G.Peru

Sabancaya - Activity from 09 to 18.09.2022 - Doc. I.G.Peru

During the week of September 12 to 18, 2022, the eruptive activity of Sabancaya remained at moderate levels, according to I.G.Peru, with an average of 47 explosions per day, accompanied by plumes of gas and ash ranging from up to 1,600 meters above the summit.

Seismicity is characterized by 366 earthquakes of volcanic origin, associated with the circulation of internal magmatic fluids, and by VT earthquakes, linked to rock fracturing.

The deformation does not reveal any significant anomalies. The presence of a lava dome in the crater is confirmed by 11 thermal anomalies, from max. 44MW.

 

The volcanic alert remains in Naranja, with a non-accessible zone of 12 km radius around the crater.

 

Sources: I.G. Peru & Mounts Project

Sabancaya - Sentinel-2 bands 12,11,8A image from 2022-09-16 / 14:57 and zoom, showing thermal anomalies at the summit - via Mounts Project - one click to enlargeSabancaya - Sentinel-2 bands 12,11,8A image from 2022-09-16 / 14:57 and zoom, showing thermal anomalies at the summit - via Mounts Project - one click to enlarge

Sabancaya - Sentinel-2 bands 12,11,8A image from 2022-09-16 / 14:57 and zoom, showing thermal anomalies at the summit - via Mounts Project - one click to enlarge

The Volcanic Alert Level for Taupō Volcano is raised to Volcanic Alert Level 1 (Minor Volcanic Unrest). Minor volcanic unrest is the cause of the ongoing earthquakes and ground deformation on Taupō Volcano.

GNS Science, through the GeoNet program, continuously monitors Taupō volcano and other active volcanoes for signs of activity. There has been an increase in earthquakes and deformations (ground movement) in Taupō since May 2022, indicating that volcanic unrest is occurring. The change in Volcanic Alert Level (VAL) this week was informed by our continued analysis of monitoring data, increased knowledge of Taupō Volcano through research programs, and new insights into the causes of past unrest at Taupō Volcano. 

Lake Taupo - Volcanic Alert raised to Level 1 as of 20.09.2022 - NZME Photo - nzherald.co.nz - one click to enlarge

Lake Taupo - Volcanic Alert raised to Level 1 as of 20.09.2022 - NZME Photo - nzherald.co.nz - one click to enlarge

Although this is the first time we have raised the Volcanic Alert Level to 1, this is not the first volcanic unrest in Taupō. There have been 17 episodes of previous unrest over the past 150 years. Several of them were more severe than what we are currently seeing in Taupō. None of these episodes, nor the many other episodes that are believed to have occurred over the past 1800 years before written records were kept, ended in an eruption. The last eruption of the Taupō volcano dates back to 232 AD ± 10 years. The probability of an eruption at Taupō remains very low in any year.

Taupō volcano - periods of volcanic unrest in Taupō from 1870 to 2022 - Doc. GeoNet

Taupō volcano - periods of volcanic unrest in Taupō from 1870 to 2022 - Doc. GeoNet

Earthquakes and deformations could continue for weeks or months to come. While some earthquakes can be felt in areas around Lake Taupō, the deformation is currently only detectable by our sensitive monitoring instruments. GNS Science continues to actively monitor the volcano.

The volcanic alert level is raised to 1
The aviation color code remains green.

 

Source: GeoNet VOLCANIC ACTIVITY BULLETINTP - 2022/04
Tue Sep 20 2022 12:56 PM; Taupo Volcano

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