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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
Reunion Island - Piton de La Fournaise - the eastern flank of the Dolomieu - photo archives © Bernard Duyck

Reunion Island - Piton de La Fournaise - the eastern flank of the Dolomieu - photo archives © Bernard Duyck

The seismic crisis that began at 12:04 local time at Piton de La Fournaise, on Reunion Island, continues.

Between 12:04 p.m. and 9:30 p.m., more than 1,300 earthquakes were recorded by the OVPF. This seismicity is localized under the summit zone and under the eastern flank (between 1.6 and 5.2 km deep).

At 6 a.m. this Tuesday, more than 2,000 earthquakes were recorded.

The strongest VT earthquake, M 2.5, lasted 48.36 s.

Piton de La Fournaise - location (epicenters) and north-south and east-west sections (showing the location in depth, hypocenters) of the earthquakes recorded and located by the OVPF-IPGP on 09/28/2020 under the Piton de the furnace. Only localizable earthquakes were shown on the map - Slope variations (in microradians) recorded on the OVPF inclinometric network on 09/28/2020. The colored bar represents the time during the day. (© OVPF-IPGP). - one click to enlarge
Piton de La Fournaise - location (epicenters) and north-south and east-west sections (showing the location in depth, hypocenters) of the earthquakes recorded and located by the OVPF-IPGP on 09/28/2020 under the Piton de the furnace. Only localizable earthquakes were shown on the map - Slope variations (in microradians) recorded on the OVPF inclinometric network on 09/28/2020. The colored bar represents the time during the day. (© OVPF-IPGP). - one click to enlargePiton de La Fournaise - location (epicenters) and north-south and east-west sections (showing the location in depth, hypocenters) of the earthquakes recorded and located by the OVPF-IPGP on 09/28/2020 under the Piton de the furnace. Only localizable earthquakes were shown on the map - Slope variations (in microradians) recorded on the OVPF inclinometric network on 09/28/2020. The colored bar represents the time during the day. (© OVPF-IPGP). - one click to enlarge

Piton de La Fournaise - location (epicenters) and north-south and east-west sections (showing the location in depth, hypocenters) of the earthquakes recorded and located by the OVPF-IPGP on 09/28/2020 under the Piton de the furnace. Only localizable earthquakes were shown on the map - Slope variations (in microradians) recorded on the OVPF inclinometric network on 09/28/2020. The colored bar represents the time during the day. (© OVPF-IPGP). - one click to enlarge

One hundred and twenty-one landslides were counted during the day of September 28, at the summit cone and in the Enclosure Fouqué.

Since the start of the crisis and until 2:30 p.m. today, 2,235 earthquakes have been recorded by the OVPF . This seismicity is always located under the summit and under the eastern flank of the volcano (between 1.6 and 5.2 km deep).


The seismicity and the source of the deformations show a migration of the magma in depth towards the eastern flank of the volcano.

Piton de La Fournaise - Illustration of the deformation over 2 months. The baselines (variation in distance between two GPS receivers) crossing the Piton de la Fournaise building, at the top (top), the base of the terminal cone (in the middle) and in the far field (bottom) are shown here. ) (see location on the associated maps). An increase is synonymous with elongation and therefore swelling of the volcano; conversely, a decrease is synonymous with contraction and therefore deflation of the volcano. The possible periods colored in light pink correspond to the eruptions. - Doc. OVPF - one click to enlargePiton de La Fournaise - Illustration of the deformation over 2 months. The baselines (variation in distance between two GPS receivers) crossing the Piton de la Fournaise building, at the top (top), the base of the terminal cone (in the middle) and in the far field (bottom) are shown here. ) (see location on the associated maps). An increase is synonymous with elongation and therefore swelling of the volcano; conversely, a decrease is synonymous with contraction and therefore deflation of the volcano. The possible periods colored in light pink correspond to the eruptions. - Doc. OVPF - one click to enlarge

Piton de La Fournaise - Illustration of the deformation over 2 months. The baselines (variation in distance between two GPS receivers) crossing the Piton de la Fournaise building, at the top (top), the base of the terminal cone (in the middle) and in the far field (bottom) are shown here. ) (see location on the associated maps). An increase is synonymous with elongation and therefore swelling of the volcano; conversely, a decrease is synonymous with contraction and therefore deflation of the volcano. The possible periods colored in light pink correspond to the eruptions. - Doc. OVPF - one click to enlarge

Since the creation of the OVPF, 5 seismic crises have lasted longer than 24 hours (March 1986, June 1987, March 1998, January 2004 and April 2007) and have led for 3 of them to the opening of eruptive cracks at low altitude.

 

Source: OVPF - 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/)

Villarica - explosion of 09/27/2020 / 9:12 p.m. - Doc. POVI

Villarica - explosion of 09/27/2020 / 9:12 p.m. - Doc. POVI

In Chile, the Villarica presented a new explosion of gas, ash and lava spatters 100 meters above the edges of the crater on September 27 at around 9:12 p.m.

It follows the explosion of September 25 at 1:50 p.m. local time.

The technical alert remains at Amarilla.

 

Sources: POVI & Sernageomin

Copahue - 28.09.2020 - gas release - photo Valentina Sepulveda / Twitter

Copahue - 28.09.2020 - gas release - photo Valentina Sepulveda / Twitter

The Copahue, on the border between Chile and Argentina, continues its activity of gas emissions occasionally laden with ash.

Night incandescence and these emissions testify to an instability of the volcanic and hydrothermal system.

The technical alert remains at Amarilla / Change in behavior of volcanic activity.

 

Sources: Sernageomin & photo by Valentina Sepulveda.

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