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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
Piton de La Fournaise - the OVPF teams in the field give the scale - photo 30.09.2022 OVPF

Piton de La Fournaise - the OVPF teams in the field give the scale - photo 30.09.2022 OVPF

The eruption started at Piton de La Fournaise on 09/19/2022 around 07:48 local time continues.

The amplitude of the eruptive tremor (indicator of surface lava emission) has been increasing since 9:40 p.m. local time yesterday (5:40 p.m. UTC). This intensification is very certainly linked to an increase in pressure within the eruptive cone which first led to the widening of the opening of the main mouth of the cone then to an increase in activity of the secondary mouth (to the south of the main cone) around 23:15 local time.

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 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 Rivals crater (© OVPF/IPGP ).

The images from the OVPF-IPGP webcam located at Piton de Bert show since 11:15 p.m. local time yesterday evening a lava projection activity greater than the previous days at the level of the eruptive site, with an enlargement of the main eruptive mouth and secondary.

Degassing is still observed at the eruptive site

the majority of lava flows are still through lava tunnels within which many resurgences are visible; lava flows also occur directly from the secondary mouth.

The lava flow estimates established by satellite method on the HOTVOLC (OPGC - Clermont Auvergne University) and MIROVA (University of Turin) platforms indicate an average flow over the last 24 hours relatively stable and low around 2-4 m³/s. As lava flow activity now takes place primarily in tunnels, these estimates are minimum values.

A main flow of fluid lava formed and was advancing eastward at about 150 meters per hour yesterday.

Piton de La Fournaise - the eruptive site on 09.30.2022 / 05:45 UT - webcam Piton de Bert 4 / OVPF - one click to enlarge

Piton de La Fournaise - the eruptive site on 09.30.2022 / 05:45 UT - webcam Piton de Bert 4 / OVPF - one click to enlarge

Piton de La Fournaise - For comparison: shooting of the eruptive site on September 28, 2022 around 3 p.m. (local time). The main mouth was more closed and the secondary mouth (on the left in the photo) was already visible but of small size (©OVPF-IPGP).

Piton de La Fournaise - For comparison: shooting of the eruptive site on September 28, 2022 around 3 p.m. (local time). The main mouth was more closed and the secondary mouth (on the left in the photo) was already visible but of small size (©OVPF-IPGP).

The processing by stereophotogrammetry of the images acquired by the OVPF-IPGP teams on September 28, 2022 made it possible to estimate the size of the eruptive cone. It was at this date, at its highest point, about 27 m high and 87 m wide.

A volcano-tectonic earthquake was recorded directly above the summit area over the past 24 hours.

The resumption of slight inflation (swelling) over the entire volcano (summit and enclosure) is confirmed but remains of very low intensity for the moment (< 1 cm).

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

 

Source: OVPF-IPGP

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

Piton de La Fournaise - 3D reconstruction by stereophotogrammetry of the eruptive cone from images (drone) acquired on September 28, 2022 (©OVPF-IPGP).

Piton de La Fournaise - 3D reconstruction by stereophotogrammetry of the eruptive cone from images (drone) acquired on September 28, 2022 (©OVPF-IPGP).

In Suwanosejima, there were 7 explosions on September 29 and 5 on September 30 until 3:00 p.m. In addition, large volcanic blocks are sometimes observed reaching about 500m from the center of the crater.
The volcanic plume accompanying the eruption rose up to 1,500m above the crater rim and a glowing glow was observed at night.
According to the Fukuoka District/Toshima Village Meteorological Observatory, about 5 km south-southwest of Mitake Crater, rumbling and falling tephra have been confirmed.
At 0036 and 17:51 on September 29, a large volcanic earthquake occurred and an earthquake intensity of 1 was observed with the epicenter on the west side of Suwanosejima.

Minor fluctuations were observed suggesting an increase in magma accumulation.
Volcanic earthquakes on the western side of the island, including large ones, continue to occur.
Vigorous eruptive activity will continue in the future, and a large volcanic eruption will occur within a radius of about 2 km from the center of Mitake Crater, according to the JMA report.

 

Source: JMA – information on the situation of the volcano on September 30, 2022 / 4 p.m. / Fukuoka District Meteorological Observatory/Kagoshima Local Meteorological Observatory.

Suwanosejima - explosion of 09.30.2022 / 17:17-18 - JMA webcam

Suwanosejima - explosion of 09.30.2022 / 17:17-18 - JMA webcam

A minor, passive ash emission from an active vent behind crater lake at Whakaari/White Island observed on Sunday September 18 has not been seen since.

The North Rim web camera continues to produce views of the crater area and regular checks by our National Geohazard Monitoring Center have shown no ash emissions. Observations from the TropOMI satellite which images sulfur dioxide (SO2) once a day have shown no signal from Whakaari/White Island since Sunday 18 September.
In recent days, images from the North Rim camera have become less clear. This is a normal result of the island vapor plume drifting over the camera and depositing a thin, salty film on the camera's protective cover. Images remain bright enough to provide useful views of the active crater area. The thin, salty film will often disappear with the next heavy rain.

Whakaari - activity downing - alert remains at 2 - GeoNet webcam comparative views 18.09.2022 & 28.09.2022 - one click to enlarge

Whakaari - activity downing - alert remains at 2 - GeoNet webcam comparative views 18.09.2022 & 28.09.2022 - one click to enlarge

GeoNet has previously suggested that the minor, passive emission of ash and sulfur dioxide on Sunday September 18 was most likely due to a small, shallow batch of magma releasing its gas and carrying small magma fragments with it. The absence of other ash or sulfur dioxide emissions since confirms this conclusion. There is no evidence of increased activity at Whakaari/White Island.

The VAL remains at Level 2 (Moderate to Intense Disorder), acknowledging the current level of activity, but also continuing to recognize the greatest level of uncertainty in our interpretation due to the current lack of consistent and useful real-time data. The Aviation Color Code is lowered to yellow, reflecting a reduced likelihood of minor ash emissions.

 

Source: GeoNet

Reykjanes ridge - earthquake of 01.10.2022 / 01:18 UTC and regional seismicity - Doc. EMSC automatic location (2)

Reykjanes ridge - earthquake of 01.10.2022 / 01:18 UTC and regional seismicity - Doc. EMSC automatic location (2)

The seismic swarm, which started in the southern part of the Reykjanes Ridge about 4 days ago, continues, with about 80 events recorded between magnitude 4.5 to 5.9.

 

 

Citizen
Response

 

 

 

 

Date & Time 

UTC

Latitude

degrees

Longitude

degrees

Depth

km

Mag

[+]

Region name

[+]

 

 

 

 

 

2022-10-01   04:58:04.21hr 52min ago

53.81 

N  

35.30 

W  

10

4.8

 REYKJANES RIDGE

 

 

 

 

2022-10-01   02:06:09.54hr 44min ago

53.91 

N  

35.28 

W  

10

5.0

 REYKJANES RIDGE

 

 

 

 

2022-10-01   01:18:53.95hr 31min ago

53.75 

N  

35.51 

W  

10

5.9

 REYKJANES RIDGE

 

 

 

 

2022-09-30   19:52:05.510hr 58min ago

53.92 

N  

35.33 

W  

10

4.8

 REYKJANES RIDGE

 

 

 

 

2022-09-30   12:50:09.9

54.07 

N  

35.29 

W  

10

4.8

 REYKJANES RIDGE

 

 

 

 

2022-09-30   12:21:07.3

53.62 

N  

35.18 

W  

10

4.6

 REYKJANES RIDGE

 

 

 

 

2022-09-30   11:38:53.2

53.54 

N  

35.34 

W  

10

4.6

 REYKJANES RIDGE

 

Bold : Earthquakes with a magnitude ≥ 4.5 in Euro-med, or ≥ 5.5 in the world
Red : Earthquakes with a magnitude ≥ 5 in Euro-med, or ≥ 6 in the world

Sources: USGS earthquake hazards program and EMSC

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