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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, #Sismologia

At the Piton de la Fournaise, after almost 3 days of decrease, the amplitude of the eruptive tremor (indicator of a lava emission on the surface) gradually re-engaged during last night. Its level stabilized during the day at around 20% of its initial amplitude.

Seismicity under the summit area remains very low with 1 single volcano-tectonic earthquake recorded over the last 24 hours.

Piton de la Fournaise - Evolution of the RSAM (indicator of a lava emission on the surface) since 19.09.2022 / 00h00 UTC time (04:00 local time) at 22.09.2022- Doc. OVPF

Piton de la Fournaise - Evolution of the RSAM (indicator of a lava emission on the surface) since 19.09.2022 / 00h00 UTC time (04:00 local time) at 22.09.2022- Doc. OVPF

Piton de la Fournaise - During a thinning - OVPF photo

Piton de la Fournaise - During a thinning - OVPF photo

Thanks to an improvement in weather conditions for a few hours yesterday afternoon, a team from the observatory was able to go to the eruptive site with the support of the Air Force Section of the Gendarmerie and the Gendarmerie Platoon of Haute Mountain. This intervention allowed:
- to confirm the precise location of the eruptive vent: A main mouth animated by a lava fountain about 20 m high, in the central part of the crack, and two more modest mouths are active. A small cone leans against the Kalla Pélé piton.
- to take a sample of lava in the flow near the vent,
- to take a sample of older projections,
- to evaluate the lava flow at about 3 m³/s.

Estimates of lava flow were established by satellite method on the HOTVOLC platform (OPGC - Clermont Auvergne University), during yesterday afternoon (peaks at 2.5 m³ / sec), as well as this morning at the favor of short thinnings (peak at 3.6 m³/s).

At the end of the day yesterday, the images from the OVPF-IPGP webcams showed a very marked decrease in activity focused on the lowest part of the crack system which opened on Monday.

Due to the very bad weather conditions on the Fournaise massif on 22.09, no on-site reconnaissance could be carried out by the OVPF-IPGP teams, whether on foot or by air. Overcast weather continues today.

 

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

 

Source: OVPF

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

Sheveluch - 23.09.2022 / 07:41 - IVS webcam

Sheveluch - 23.09.2022 / 07:41 - IVS webcam

Sheveluch - volcanic re-suspended ash advisory at 23.09.2022 / 0600Z - Doc. VAAC Tokyo

Sheveluch - volcanic re-suspended ash advisory at 23.09.2022 / 0600Z - Doc. VAAC Tokyo

The growth of the Sheveluch lava dome continues; strong fumarolic activity, incandescence of the lava dome, explosions and hot avalanches accompany this process. Video and satellite data by Kvert showed a thermal anomaly over the volcano.

The resuspended ash plume extended 430 km east of the volcano.

 

Source: KVERT and VAAC Tokyo

Tectonic context of Samoa and Ta'u island - image Sentinel-2 Copernicus / GVP-12401
Tectonic context of Samoa and Ta'u island - image Sentinel-2 Copernicus / GVP-12401

Tectonic context of Samoa and Ta'u island - image Sentinel-2 Copernicus / GVP-12401

The Taʻū island related earthquake swarm continues, with seismicity remaining weak over the past week. The position of the source of the earthquake has not changed. Three earthquakes were reported in the past week, with magnitudes similar to larger earthquakes earlier in this swarm. Satellite data from the previous week observed no volcanic activity.

The National Earthquake Information Center (NEIC) will soon begin publishing the preliminary locations of the largest earthquakes that occurred during this period of seismic unrest in American Samoa. Earthquake locations and depths are currently best estimates, with large uncertainties resulting from the fact that the monitoring network is limited to the east-west orientation of the islands of American Samoa.

Current volcanic alert level: Advisory
Current Aviation Color Code: Yellow

 

Source: USGS/HANS

Tjörnes Fracture Zone - location and magnitude of earthquakes as of 23.09.2022. / 07:55 - Doc. IMO
Tjörnes Fracture Zone - location and magnitude of earthquakes as of 23.09.2022. / 07:55 - Doc. IMO
Tjörnes Fracture Zone - location and magnitude of earthquakes as of 23.09.2022. / 07:55 - Doc. IMO

Tjörnes Fracture Zone - location and magnitude of earthquakes as of 23.09.2022. / 07:55 - Doc. IMO

The seismic swarm over the Tjörnes Fracture Zone, which began on September 8, continues to decline.

More than 12 thousand earthquakes have been detected since the start of the swarm. When the swarm intensity was at its highest, a thousand earthquakes were detected each day, but the past two days several hundred earthquakes have been recorded per day.

The Ministry of Civil Protection and Emergency Management announced a level of uncertainty for ongoing seismic activity in North Iceland on September 9, 2022.


Source: IMO, written by a specialist as of 21 Sep 09:35 GMT

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