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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
 Piton de La Fournaise - seismic crisis recorded from 7 am local 11 August 2019 - Doc. OVPF

Piton de La Fournaise - seismic crisis recorded from 7 am local 11 August 2019 - Doc. OVPF

Towards a fourth eruption at Piton de La Fournaise ?

Since 07:00 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 magma reservoir and is spreading to the surface.

An eruption is likely in the near future.

Under these conditions, the prefect of Reunion has decided to implement the alert phase 1 "probable eruption" of the specific device ORSEC volcano starting today at 07:00.

As a result, public access to the upper part of the Piton de la Fournaise enclosure, whether from the Pas de Bellecombe trail or from any other trail is prohibited. It is recalled that the landing of aircraft in the area of ​​the volcano is regulated and subject to authorization from the Prefecture.

Piton de la Fournaise - 11.08.2019 / 05h16 - Illustration of the deformation over 2 months. Bases are shown here (variation of distance between two GPS receivers) crossing the Piton de la Fournaise building, at the top (at the top), at the base of the terminal cone (in the middle) and in the far field (at the bottom ) (see location on the associated maps). A rise is synonymous with elongation and therefore swelling of the volcano, inversely a decrease is synonymous with contraction and therefore deflation of the volcano. Any periods colored in light pink correspond to eruptions. - Doc.OVPF

Piton de la Fournaise - 11.08.2019 / 05h16 - Illustration of the deformation over 2 months. Bases are shown here (variation of distance between two GPS receivers) crossing the Piton de la Fournaise building, at the top (at the top), at the base of the terminal cone (in the middle) and in the far field (at the bottom ) (see location on the associated maps). A rise is synonymous with elongation and therefore swelling of the volcano, inversely a decrease is synonymous with contraction and therefore deflation of the volcano. Any periods colored in light pink correspond to eruptions. - Doc.OVPF

Piton de La Fournaise - to an éruption or an intrusion ? - image Sentinel 2 bands 12,11,4 du 10.08.2019 - one click to enlarge

Piton de La Fournaise - to an éruption or an intrusion ? - image Sentinel 2 bands 12,11,4 du 10.08.2019 - one click to enlarge

According to Aline Peltier, it is known that the magma left the magmatic chamber, but without knowing precisely the place of the future eruption. The very bad weather on the volcano area prevents for the moment any aerial observation.

More information in the day ...

 

Source: OVPF & Prefecture of Reunion

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

Nevados of Chillan - image Sentinel-2B L1C from 09.08.2019 / via Copernicus - one click to enlarge

Nevados of Chillan - image Sentinel-2B L1C from 09.08.2019 / via Copernicus - one click to enlarge

In Nevados de Chillan, the control stations recorded an explosion, associated with a long period earthquake (LP) in relation to the dynamics of internal fluids, this August 10 at 22h23 local / 11 August at 02h23 UTC.

The depth of the earthquake was 300 meters, and the displacement reduced by 210 cm².

Incandescence, related to the emission of gases and pyroclastic materials of high temperature, was observed; deposits were made in the area of ​​the active crater.

 

Source: Sernageomin

Etna - collapse of part of the crater wall NE - photo M.Mammino via INGVvulcani

Etna - collapse of part of the crater wall NE - photo M.Mammino via INGVvulcani

Since last August 6, there has been ash emissions from the Northeastern crater (NEC) of Etna.

Sometimes these emissions are more dense and abundant, forming a plume that is dispersed by the wind mainly near the eruptive mouth in the dials of the south and east of the volcano.
On the occasion of these events, much of the NEC's inner north wall had to collapse. The image highlights the collapsed wall (white arrows), the old crater border (yellow dashed line) and the new determined border (continuous yellow line). The photograph was taken on the morning of August 10, 2019 by Michele Mammino, from the western edge of the NEC.

 

Source: INGVvulcani via Marco Neri

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