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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

Since 07:20 local time, a seismic crisis is recorded on the instruments of the Volcanological Observatory of Piton de la Fournaise. This seismic crisis is accompanied by rapid deformation. This indicates that the magma is leaving the magmatic reservoir and is spreading to the surface. This crisis lasted half an hour, the activity has since calmed down, there is no acceleration.

An eruption is likely in the short term in the next few minutes or hours. Additional information will follow regarding the area affected by this magmatic propagation to the surface. All options remain open.

Under these conditions, the prefect decided to trigger the alert phase 1 "probable or eminent eruption" of the specific ORSEC volcano device from this day at 8:30 am. Consequently, public access to the upper part of the Piton de la Fournaise enclosure, whether from the Pas de Bellecombe trail or any other trail, is prohibited. It is recalled that the landing of aircraft in the volcano area is regulated and subject to authorization from the Prefecture.

The national gendarmerie and the national forestry office were responsible for ensuring the application of these security measures on the site.

 

Sources: OVPF & Reunion Prefecture

Find all the information relating to the activity of Piton de la Fournaise on the various media of the OVPF-IPGP:
- the website (http://www.ipgp.fr/fr/ovpf/actualites-ovpf),
- the Twitter account (https://twitter.com/obsfournaise?lang=fr),
- and the facebook account (https://www.facebook.com/ObsVolcanoPitonFournaise/)

Activity of Piton de La Fournaise, Sangay, Reventador, Nishinoshima and Tjörnes fracture zone
Piton de La Fournaise -  The seismic crisis started on July 3, 2020 at 07:20 local time, ended around 08:00 (local time) - Doc. OVPF

Piton de La Fournaise - The seismic crisis started on July 3, 2020 at 07:20 local time, ended around 08:00 (local time) - Doc. OVPF

The IGEPN reports a high level of surface activity to the Sangay, as well as its internal level.

The seismicity is characterized by 25 LP earthquakes and 239 explosion earthquakes between 1 ° and 2 July at 11 a.m.

The volcano is cloudy, and lahars are possible during these rains.

No emissions were observed, but VAAC Washington issued three ash emission notices; they reached 900 meters above the crater in a northwest direction.

The alert level is Amarillo

 

Source: IGEPN

Sangay - morphological changes between 17.05.2019 and 24.06.2020 - doc. IGEPN

The activity remains superficially moderate at the Reventador, with in the evening of July 1, gas and ash emissions, accompanied by rolling incandescent materials and incandescence in the crater.

Seismicity is characterized by 14 LP earthquakes, 21 explosion earthquakes, 4 episodes of emission tremor and 1 of harmonic tremor.

The volcano generally remains covered.

The alert level is Naranja.

 

Source: IGEPN

Reventador - eruption on the night of July 2 with an IR camera - the volcano is often obscured by clouds - Doc. IGEPN

Activity continues in Nishinoshima, with ash and gas emissions spotted by satellites.

Nishinoshima - strong sulfur dioxide signal detected on July 3, 2020 by Sentinel-5P / Tropomi, with 16.98 DU SO2 at an altitude of 10.5km. - Doc. DLR- BIRA - ESA / Tropomi

Nishinoshima - strong sulfur dioxide signal detected on July 3, 2020 by Sentinel-5P / Tropomi, with 16.98 DU SO2 at an altitude of 10.5km. - Doc. DLR- BIRA - ESA / Tropomi

Nishinoshima - ash emissions 03.07.2020 / 1:30 p.m. - via HayakawaYukio

Nishinoshima - ash emissions 03.07.2020 / 1:30 p.m. - via HayakawaYukio

In the north of Iceland, the seismic swarm at the mouth of Eyjafjörður is still in progress. Tonight, 2/7 at 7.20pm, an earthquake of magnitude 3.6 was detected between Olafsfjörður and Dalvik.

Since the crisis began on June 19, the National Meteorological Office's earthquake system has located about 10,000 earthquakes. Three earthquakes over M5 were detected in the hryvnia, the largest on Sunday evening in. 7:07 pm from M5.8 to 30 km NNE from Siglufjörður. Other earthquakes larger than 5 were 5.6 and 5.4 and were located more than 20 km NE of Siglufjörður.

Many smaller earthquakes are still measured in the region, and larger earthquakes are likely to occur.
 

Landslide danger zone - Civil protection

The state of uncertainty in northern Iceland, declared on June 19 by the Icelandic Department of Civil Protection and Emergency Management, is still in force. With the continuation of the seismic swarm, the risk of falling rocks and landslides is increased along the north coast of Iceland, as is that of a tidal wave in the event of a major earthquake.

Traffic in danger zones shown on the map must be done with caution, and it is advisable to stay away from ports and coasts for several hours after strong earthquakes.

Sources : IMO & Iceland review

Tjörnes FZ - location of earthquakes and magnitude on 02.07.2020 / 3.30 p.m. - Doc. IMO
Tjörnes FZ - location of earthquakes and magnitude on 02.07.2020 / 3.30 p.m. - Doc. IMO
Tjörnes FZ - location of earthquakes and magnitude on 02.07.2020 / 3.30 p.m. - Doc. IMO

Tjörnes FZ - location of earthquakes and magnitude on 02.07.2020 / 3.30 p.m. - Doc. IMO

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