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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
Etna "saddle cone" SEC - Strombolian activity July 21 / 02:52 - photo Boris Behncke

Etna "saddle cone" SEC - Strombolian activity July 21 / 02:52 - photo Boris Behncke

During the week of July 13-19, intracratical explosive activity was observed mainly affecting the New Southeast Crater (NSEC) and the Voragine (VOR) of Etna, with low ash emissions which quickly dispersed to high altitude and with materials thrown on the crater edges.

On July 15, surveillance cameras recorded a slight increase in the variable Strombolian explosive activity of the aforementioned craters, with ash emissions that quickly dispersed near the summit area and with spatter projections above the edges. from the crater.

This Strombolian activity continued at the "saddle cone" on July 21 in the early hours.

Etna - DEM of the summit area with zoom of sectors linked to the SEC-NSEC system (A) and BN and VOR craters (B). Indented black lines indicate the edge of the upper craters (BN: Bocca Nuova, with the northwest (BN-1) and southeast (BN-2) depressions; VOR: Voragine; NEC: northeast crater; SEC : south-eastern crater; and NSEC: New Southeast Crater. The indented blue line indicates the depression inside the Bocca Nuova. The yellow circles: degassing vents; the red circles: active vents - Doc INGV OE

Etna - DEM of the summit area with zoom of sectors linked to the SEC-NSEC system (A) and BN and VOR craters (B). Indented black lines indicate the edge of the upper craters (BN: Bocca Nuova, with the northwest (BN-1) and southeast (BN-2) depressions; VOR: Voragine; NEC: northeast crater; SEC : south-eastern crater; and NSEC: New Southeast Crater. The indented blue line indicates the depression inside the Bocca Nuova. The yellow circles: degassing vents; the red circles: active vents - Doc INGV OE

Etna - degassing on 21.07.2020 / 08h00, seen from Tremestieri Etnéo- photo Boris Behncke

Etna - degassing on 21.07.2020 / 08h00, seen from Tremestieri Etnéo- photo Boris Behncke

The other summit craters were mainly characterized by outgassing activity.

The fracturing seismicity remains moderate and the amplitude of the tremor on average values. Low infrasonic activity.

Etna's soil deformation monitoring networks did not show significant changes during the week SO2 flux is at a medium-low level.

 

Source: INGV - Weekly bulletin 13,07 - 19,07,2020 - link

Telica - ash explosion on 07/20/2020 / 5:41 p.m. - photo webcam seismic station TELN / Sinapred

Telica - ash explosion on 07/20/2020 / 5:41 p.m. - photo webcam seismic station TELN / Sinapred

Telica - ash explosion on 07/20/2020 / 6:36 p.m. - photo webcam seismic station TELN / Sinapred

Telica - ash explosion on 07/20/2020 / 6:36 p.m. - photo webcam seismic station TELN / Sinapred

In Nicaragua, Sinapred reports small gas and ash explosions at Telica, with release of materials 200 meters above the edge of the crater; these explosions are produced following the obstruction of the conduit by small landslides, and accumulation of gas.

The tremor has increased from 27 to 153 units during the explosion and remains high, indicating a possibility of small explosions in the following hours or days.

It is advisable to stay at least 1.5 km away. from the Telica crater.

 

Source: Sinapred

Fuego - photo archives Conred 05.2020

Fuego - photo archives Conred 05.2020

Insivumeh reports weak to moderate explosions at Fuego, at a rate of 8-11 per hour, accompanied by plumes of gray ash reaching 4,500-4,700 meters asl.

Incandescent projections are observed 100-200 meters above the crater, which generate weak to strong fallout, and avalanches in the direction of the Seca, Tanilyua, Ceniza, lajas and Honda barrancas, with blocks reaching the level of vegetation.

The shock waves are perceived at 20 km from the volcanic perimeter, with vibrations of the roofs and windows.

Ash falls are reported in the villages to the south, Panimache I, Morelia, Santa Sofia, Finca Palo Verde, Sangre de Cristo, Yepocapa, etc.

 Pacaya - lava flows - photos William Chigna 07/20/2020
 Pacaya - lava flows - photos William Chigna 07/20/2020

Pacaya - lava flows - photos William Chigna 07/20/2020

At Pacaya, the volcano's activity ranges from a white fumarole at Mackenney and explosions at about 78-100 meters high.

During the night, three lava flows are observed in a northwest direction, located in an area of cracks in the plateau, about 300 meters long.

Seismicity is marked by the tremor associated with the rise of magma, the production of gas and the movements of lava flows.

The ban on climbing the summit is maintained, because of the risks.

 

Source: Insivumeh

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