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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 of Piton de La Fournaise, which began on September 19, 2022 around 07:48 local time, continues. Following the decrease in activity in the lava fountain and the focus of the activity on the lowest part of the cracks opened at the start of the eruption, the amplitude of the eruptive tremor (indicator of an emission of lava on the surface ) continued its slow decrease throughout the day of 20.09, and stabilized since midnight (UTC time, 00h time) at about 10% 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 ).

The seismicity under the summit zone has now disappeared (no volcano-tectonic earthquake recorded over the last 24 hours).

Despite some clearings at the end of the morning:

- no lava flow estimate could be established by satellite method on the HOTVOLC platform (OPGC - Clermont Auvergne University), probably due to unfavorable cloud cover.

- 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.

 Piton de La Fournaise - 21.09.2022 - thinning in the early afternoon - activity downing - photo OVPF - one click to enlarge

Piton de La Fournaise - 21.09.2022 - thinning in the early afternoon - activity downing - photo OVPF - one click to enlarge

The OVPF-IPGP teams closer to the eruption on the afternoon of September 21 with the help of SAG and PGHM.

They noted a weak surface activity but which continues.

On the program: samples of lava and projections, and diagnosis on a faulty monitoring station located near the eruption.

Piton de La Fournaise - 21.09.2022 / 2:25 p.m. UT - camera Piton de Bert 1 / OVPF - one click to enlarge

Piton de La Fournaise - 21.09.2022 / 2:25 p.m. UT - camera Piton de Bert 1 / OVPF - one click to enlarge

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, with a maximum peak estimated at 8000 tons per day (8 kton) at the start of the eruption. Over the last 24 hours, the peak flow of SO2 measured on the same site was only 2300 tons.

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

Kilauea - Halema'uma'u - new flows on O & N rims of crater floor - 2022-09-20 / 6:00 PM HST HVO cam F1 - click to enlarge

Kilauea - Halema'uma'u - new flows on O & N rims of crater floor - 2022-09-20 / 6:00 PM HST HVO cam F1 - click to enlarge

Increased seismicity, ground deformation, and surface lava flows at Kīlauea's summit occurred between 3 p.m. and 6 p.m. HST on September 20. All activity was restricted to the summit region and there is no indication of activity migrating into either rift zone.
Beginning at 3:00 p.m., seismic activity below the summit of Kīlauea Volcano began to increase, followed by summit inflation beginning around 4:20 p.m., coinciding with a 7-meter drop in the level of the lava lake. The crater floor surrounding the lava lake also subsided several meters at 4:30 p.m. New surface lava eruptions occurred on the western and northern margins of the crater floor.
Seismic activity returned to near-bottom levels from 6 p.m.

Kilauea - brutal inflation on 20.09.2022 - Doc. HVO 21.09.2022  - one click to enlarge

Kilauea - brutal inflation on 20.09.2022 - Doc. HVO 21.09.2022 - one click to enlarge

This activity likely represented a temporary blockage of lava eruption at Halemaʻumaʻu, causing pressurization below the surface. This resulted in earthquakes and ground inflation. Once the blockage was cleared, lava eruption resumed with new eruptions on the floor of Halemaʻumaʻu crater.

 

Source: HVO Wednesday, September 21, 2022, 05:05 UTC

Alaid - fumarolic activity in the center of the crater, covered with lava and pyroclasts from the 2015-2016 eruption - photo V. Rashidov. IVS FEB RAS - one click to enlarge

Alaid - fumarolic activity in the center of the crater, covered with lava and pyroclasts from the 2015-2016 eruption - photo V. Rashidov. IVS FEB RAS - one click to enlarge

KVERT reported that an intense thermal anomaly over Alaid in the northern Kuril Islands identified in satellite images from 11:39 a.m. local time on September 15 likely indicated the start of a Strombolian eruption. The Aviation Color Code was raised to yellow (the second-lowest level on a four-color scale) the following day.
Satellite images acquired at 11:08 a.m. on September 18 showed a plume of gas and steam containing ash drifting from the ESE. Several photographs of the eruption were taken on the same day.

Mirova reports moderate to high thermal anomalies on September 20, 21 and 22 (see graphs below)
The Aviation Color Code was raised to Orange.

 

Sources: KVERT, Mirova, and Global Volcanism Program

Alaid - thermal anomalies and radiative power as of 09.22.2022 / 02:15 - Doc Mirova _MODIS
Alaid - thermal anomalies and radiative power as of 09.22.2022 / 02:15 - Doc Mirova _MODIS

Alaid - thermal anomalies and radiative power as of 09.22.2022 / 02:15 - Doc Mirova _MODIS

The activity of Home Reef, in the Tonga Islands, is progressing. Tonga Geological Services have identified a total of 19 eruptive episodes over the past 48 hours, including an ash eruption. These episodes are associated with fumarolic activities and steam emissions at 1,000-2,000 meters into the atmosphere. Based on a satellite image taken on September 19, the measurements of the island are 211 meters north-south and 218 meters east-west; its surface is estimated at 34,803 m², for a height of approximately 15 meters asl.

 

Sources: Tonga Geological Services & USGS

Home Reef - eruptions of the last 48 hours as of 09.22.2022 - Doc .VOLCAT via TGS - one click to enlarge

Home Reef - eruptions of the last 48 hours as of 09.22.2022 - Doc .VOLCAT via TGS - one click to enlarge

Home Reef - dimensions as of 09.18.2022 - image Worldview-3 sat nat colors - via USGS & TGS

Home Reef - dimensions as of 09.18.2022 - image Worldview-3 sat nat colors - via USGS & TGS

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