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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 : #Actualités volcaniques
 Agung - steam plume on 16.10.2017 - photo Hakon Gustavsen

Agung - steam plume on 16.10.2017 - photo Hakon Gustavsen

At Agung, the summit is dominated today by a plume of steam up to 200 meters, possibly potentiated by rains on the summits yesterday.

In comparison with October 14, seismicity shows a decrease in episodes on October 15:

- 14 October: 764 deep VA volcanic earthquakes, 283 VB volcanic earthquakes, 89 local tectonic earthquakes, and 6 nonharmonic tremor episodes.

- 15 October: 474 deep VA volcanic earthquakes, 270 VB volcanic earthquakes, 44 local tectonic earthquakes.

Sources: PVMBG, Magma Indonesia and photo Hakon Gustavsen

 Agung - seriation and number of earthquakes on 15.10.2017 - Doc. Magma Indonesia

Agung - seriation and number of earthquakes on 15.10.2017 - Doc. Magma Indonesia

 Agung - variations of the seismic amplitude between 18.07.2017 and 16.10.2017 - Doc. PVMBG

Agung - variations of the seismic amplitude between 18.07.2017 and 16.10.2017 - Doc. PVMBG

In Villarica, the day of 16 September is to shown in the activity table of the previous month.

At about 8:39, a particle emission from the bottom of the crater generated a brown plume reaching 250 meters in height, and ash falls on the northwest and northeast upper flanks, clearly visible from Pucón.

On 26 September, on the basis of photos, the POVI determines the depth of the crater at 105 meters and its diameter at 55 meters; the crater houses a central active orifice with a diameter of 6 meters.

The bottom of the crater rose about 4 meters between 26 September and 15 October and the diameter of the active orifice has increased by about 2 meters.

Sources: Werner Keller / POVI / Fundación Volcanes de Chile

Villarica - chronological sequence of the ash emission of 16,09,2017 / 8h39-8h40 - photo POVI / W.Keller

Villarica - chronological sequence of the ash emission of 16,09,2017 / 8h39-8h40 - photo POVI / W.Keller

Villarica - comparison between 15 and 16 September 2017, where a surface of 20,000 m² is covered with pyroclastic materials - photo POVI / W.Keller

Villarica - comparison between 15 and 16 September 2017, where a surface of 20,000 m² is covered with pyroclastic materials - photo POVI / W.Keller

Villarica - 16.09.2017 - image ESA Sentinel-2 SWIR composite

Villarica - 16.09.2017 - image ESA Sentinel-2 SWIR composite

At Shinmoedake, the forbidden zone was extended to 3 km around the crater, due to an increase in volcanic gas emissions, and the concomitant risk of eruption.

Source: JMA & Japan Today

Shinmoedake - 15.10.2017 - photo JMA / Japan Today / Kiodo

Shinmoedake - 15.10.2017 - photo JMA / Japan Today / Kiodo

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