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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
Planchón Peteroa - 01.02.2019 - photo Sernageomin

Planchón Peteroa - 01.02.2019 - photo Sernageomin

On 1st February from 5 pm local time, the cameras of the Planchón Peteroa volcanic complex recorded a steady and continuous increase in particulate matter emissions, with a column of 2,000 meters and a dispersion towards the east. This episode was accompanied by VLP earthquakes between 17 and 19h local, in connection with the injection of magma from a greater depth, and tremor.

The increase in ash emissions and seismicity suggest an open system, and possible new minor eruptive episodes affecting the area of ​​active craters.

The technical alert is maintained in Amarillo level.

 

Source: Sernageomin

Planchón Peteroa - 01.02.2019 - photo Sernageomin

Planchón Peteroa - 01.02.2019 - photo Sernageomin

The Turrialba, in Costa Rica, was the seat the 1st of February at 6:46 of a small eruption; it produced a plume of gray ash that rose 400-500 meters above the crater before dispersing to the northwest northwest.

The eruption lasted 15 minutes.

Source: Red Sismologica Nacional

 Turrialba - 01.02.2019 / 6:47 - RSN

 Turrialba - 01.02.2019 / 6:47 - RSN

Boris Behncke reports for the 1st of February pulsatile emissions of ash at the Bocca Nuova of Etna.

According to the volcanologist, there is no evidence of the arrival of new magma on the surface, all the material emitted being derived from magma already present in the system for a while.

The northeast crater emitted during the day a plume of steam and gas flapped by the winds.

Sources: Boris Behncke, Gio Giusa and Jos. Nasi

Etna - 01.02.2019 - ash emission by the Bocca nuova, seen from Tremestieri Etneo - picture Boris Behncke

Etna - 01.02.2019 - ash emission by the Bocca nuova, seen from Tremestieri Etneo - picture Boris Behncke

Etna - 01.02.2019 - ash emission by the Bocca nuova, and degassing of the NEC - photo Gio Giusa

Etna - 01.02.2019 - ash emission by the Bocca nuova, and degassing of the NEC - photo Gio Giusa

Etna - 02.02.2019 /  9h41 GMT - photo J.Nasi / Butterfly helicopters

Etna - 02.02.2019 / 9h41 GMT - photo J.Nasi / Butterfly helicopters

A white, 300 meter high degassing plume overcame the Pacaya on January 31, with a westward dispersion.

Seismicity is characterized by a tremor associated with rising magma and gases to the surface.

Strombolian explosions, between 5 and 30 meters, animate the Mackenney crater; during the night, incandescence is observed, as well as two lava flows in a northwesterly direction, measuring about 70 and 75 meters.

Source: Insivumeh & Conred

 Pacaya degassing - photo Conred 01.02.2019

 Pacaya degassing - photo Conred 01.02.2019

The month of January 2019 will have been marked in the Piton de la Fournaise by a low seismicity under the summit craters, a lack of significant deformation, and CO2 fluxes in the ground in far field relatively constant on low values. This testifies to the absence of magmatic transfers from the deep zones to the more superficial zones (or at least their slowdown).

Piton de La Fournaise - Comparison between the standardized means of ground CO2 flow data, gross (in blue) and corrected (in red), recorded on far-field stations (a) since October 2016 (date installation of the last station) and (b) over one year. The eruptive periods are represented in red. - Doc.OVPF

Piton de La Fournaise - Comparison between the standardized means of ground CO2 flow data, gross (in blue) and corrected (in red), recorded on far-field stations (a) since October 2016 (date installation of the last station) and (b) over one year. The eruptive periods are represented in red. - Doc.OVPF

A seismic activity affects the island of Mayotte since the beginning of May 2018. These earthquakes form a swarm with epicentres grouped at sea, 30 to 60 km east of the coast of Mayotte. The vast majority of these earthquakes are of low magnitude, but several events of moderate magnitude (at most M5.9) have been strongly felt by the population and have damaged some buildings.

In January, the month was particularly active with 21 earthquakes of Magnitude > 4. In parallel, data from the Teria network GPS stations installed on the island of Mayotte, which are distributed by the RGP of the Institut Géographique National (IGN), have always indicated since July an overall shift towards the is (about 12cm since July) and subsidence (subsidence of about 5-10cm following the sites since July.

Automatic and daily calculations have been set up at the OVPF (via the Gipsy software) in order to follow these deformations, as well as the source at their origin. Thus for the last 3 months, the source of "depressurization" at the origin of these movements could be located about thirty km east of Mayotte and about 35-45km deep. This suggests that fluid transfers in the crust are still continuing

Source: OVPF - IPGP

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)

- the Facebook account (https://www.facebook.com/ObsVolcanoPitonFournaise)

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