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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
 Whakaari / White Island - steam emissions - photo GeoNet 09.06.2020

Whakaari / White Island - steam emissions - photo GeoNet 09.06.2020

GeoNet scientists recorded a short-lived pulse of gas that crossed the Whakaari / White Island volcano from depth. This gas pulse was accompanied by a slight elevation of the ground in the vent area and is probably linked to an intrusion of a new batch of magma at a shallow depth under the volcano. The volcanic alert level remains at level 2 and the aviation color code is yellow.

This short gas pulse reminds us that the volcano is still in a high state of agitation with shallow magma.

Thermal infrared images taken during the observation flight on Wednesday 3 June show that the lava lobes (extrusions observed for the first time in early January) are still very hot, at around 450 ° C. The recent rains have increased emissions steam and water has accumulated on the bottom of the crater.

Occasional slightly high tremor episodes are still observed, although overall tremor levels remain low and in the background levels for the volcano. A rash could occur with little precursor activity. The plausible triggers for an eruption remain the collapse of unstable materials around the vents, the sudden release of gas from the magma and the rapid entry of water onto the shallow magma body.

If an explosive activity produces an ash cloud, the likelihood of ash affecting the continent remains very low. Under appropriate weather conditions, the plume of gas and vapor can be seen on the continent in the form of weak acid rain.

The volcanic alert level remains at level 2. The aviation color code remains yellow.

 

Source: GeoNet 09.06.2020

Pacaya - 2020.06.08 lava flow - Sentinel-2 bands 12,11,5 - Doc. Insivumeh

Pacaya - 2020.06.08 lava flow - Sentinel-2 bands 12,11,5 - Doc. Insivumeh

At Pacaya, the Mackenney crater is observed, with a white fumarole, shriveled to the south and southwest.

During the night and early morning of June 8, 2020, Strombolian explosions with ejections of volcanic materials 50, 75 and 100 meters high were observed. The lava flow in a northeast direction with a length of about 700 meters. (unlike the length announced with the Sentinel-2 image - information both announced by Insivumeh)

The PCG and PCG5 seismic stations record tremors associated with the rise of magma and gases.


Source: Insivumeh

 Fuego - block avalanches 08.06.2020 - Sentinel-2 bands 12,11,5 - Doc. Insivumeh
 Fuego - block avalanches 08.06.2020 - Sentinel-2 bands 12,11,5 - Doc. Insivumeh

Fuego - block avalanches 08.06.2020 - Sentinel-2 bands 12,11,5 - Doc. Insivumeh

The observatory of the Fuego volcano reports a weak white fumarole with a height of 4,100 meters, weak and moderate explosions, between 7 to 10 per hour, accompanied by columns of gray ash, at a height of 4,300 to 4,600 meters, dispersed in a north and northeast direction.

Weak incandescent pulses are observed at the crater, as are weak and moderate block avalanches, towards the Trinidad, Taniluyá, Ceniza, Las Lajas, Honda and Seca barrancas.

The explosions generated low rumblings with shock waves, vibrant roofs and windows in the homes of villages near the volcano. Sounds similar to locomotives are heard for periods of 1 to 3 minutes.


Source: Insivumeh

Sabancaya - summary of the activity between 1 ° and 7 June 2020 - Doc. I.G.Peru

Sabancaya - summary of the activity between 1 ° and 7 June 2020 - Doc. I.G.Peru

The Peruvian Geophysical Institute (IGP) reports that the eruptive activity of the Sabancaya volcano remains at moderate levels; that is to say with the continuous recording of explosions, at the rate of 18 explosions daily on average, with ash plumes up to 1.5 km high above the summit of the volcano and the emission consequent of ash and gas.

During this period, the IGP recorded and analyzed the occurrence of approximately 598 earthquakes of volcanic origin, associated with the circulation of fluids (magma, gas, etc.) within the volcano.

Between June 2 and 5, earthquakes of magnitudes M2.9 to M3.6 occurred, located between 12 km to 15 km southwest and northeast of the volcano, near the populated centers of Huambo, Maca and Pinchollo, which would be associated with the tectonic and volcanic activity of the area.

The monitoring of the deformation of the volcanic structure, using GNSS data (processed with fast orbits), does not present any significant anomalies; however, slight inflation in the northern sector of Sabancaya has been recorded since May 23, probably linked to the eruptive activity of the volcano.

Satellite surveillance identified the presence of 3 thermal anomalies with values ​​included with values ​​between 1 MW-13 MW, associated with the presence of a body of lava on the surface of the volcano crater.

The volcanic alert remains in Naranja, along with a 12 km prohibited area around the crater.

 

Source: I.G. Peru

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