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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
 Nishinoshima - SAR intensity images from August 14, 2020 (left) and July 31, 2020 (right) - Doc. GSI - one click to enlarge

 Nishinoshima - SAR intensity images from August 14, 2020 (left) and July 31, 2020 (right) - Doc. GSI - one click to enlarge

The GSI has uploaded the SAR intensity images of the Daichi-2 satellite taken of Nishinoshima between July 31 and August 14, 2020.

The interference zones are considerably reduced over almost the entire surface of the island, covered with ash.

The image taken on August 14 shows an expansion of the pyroclastic cone crater.

This August 15, gas and ash emissions continue, with the emission of a plume in a southwesterly direction, dissipating in a western sector.

 

Sources: GSI, VAAC Tokyo & Nasa worldview

GSI Croissance de Nishinoshima capturée par Daichi n ° 2

Nishinoshima - Nasa Eosdis Worldview image from 08/15/2020 one click to enlarge

Nishinoshima - Nasa Eosdis Worldview image from 08/15/2020 one click to enlarge

The National Institute of Geophysics and Volcanology announces that on the morning of August 14, an increase in Strombolian activity is observed at the NSEC / New south-eastern crater (saddle cone) of Etna; it fuels an ash emission which generates a dark plume of ash dispersed by the wind in a south-southeast direction and with ash falls in the region of Pedara, Trecastagni and Viagrande.

The plume height reaches between 700 and 1,200 meters above the summit, justifying the passage of the aviation code from orange to red.

The fall of coarse pyroclastic material on the sides of the NSEC cone is reported by ground crews. This explosive activity is characterized by persistence and fluctuation in intensity and is associated with modest ash emissions.

From a seismic point of view, the amplitude of the tremor shows variations in the range of average values ​​and, sometimes, in that of high values. The location of the source of the quake is confined to the area of ​​the new south-eastern crater, at an altitude of 2900-3000 m above sea level. From an infrasound point of view, no significant activity is reported.

From the observation of the parameters relating to the deformations of the ground, no significant change was detected.

 

Source: INGV OE

Etna, seen from Santa Venerina - ash plume from 08/14/2020 - Photo by Mario Mattia (INGV-OE).

Etna, seen from Santa Venerina - ash plume from 08/14/2020 - Photo by Mario Mattia (INGV-OE).

The activity of Sinabung, in level 3 / siaga, continues with five eruptive episodes reported on August 14, 2020 by Magma Indonesia:

 

- Friday August 14, 2020 at 10:30 am WIB, with an ash plume observed at ± 2100 m above the summit (± 4560 m above sea level). The ash column was gray with moderate intensity to the southeast and south. This eruption was recorded on a seismograph with a maximum amplitude of 64 mm and a duration of 100 seconds.

- Friday August 14, 2020 at 2:25 p.m. WIB, with an ash plume observed at ± 1500 m above the summit (± 3960 m above sea level). The ash column was gray with moderate to thick intensity to the east and southeast. This eruption was recorded on a seismograph with a maximum amplitude of 68 mm and a duration of 229 seconds.

- Friday August 14, 2020 at 2:55 p.m. WIB. No visual observations were made. This eruption was recorded on a seismograph with a maximum amplitude of 90 mm and a duration of 62 seconds

 Sinabung - 08/04/2020 / 12:15 p.m. - Magma Indonesia

Sinabung - 08/04/2020 / 12:15 p.m. - Magma Indonesia

- Friday August 14, 2020 at 4:56 p.m. WIB with an ash plume observed ± 4200 m above the summit (± 6660 m above sea level). We observe that the ash column is gray to brown in color with a thick intensity towards the east. This eruption was recorded on a seismograph with a maximum amplitude of 40 mm and a duration of 580 seconds.

- Friday August 14, 2020 at 11:00 p.m. WIB with the observed height of the ash column ± 1000 m above the summit (± 3460 m above sea level). The ash column was observed to be gray with moderate to thick intensity towards the south. This eruption was recorded on a seismograph with a maximum amplitude of 88 mm and a duration of 387 seconds.

 

Note that on the images of the last two episodes, we can see small pyroclastic flows.

 

Source: Magma Indonesia - reports by Deri Al Hidayat and Armen Putra

Sinabung - plume of 08/14/2020 / 5:03 p.m. - note a small pyroclastic flow - Magma Indonesia

Sinabung - plume of 08/14/2020 / 5:03 p.m. - note a small pyroclastic flow - Magma Indonesia

 Sinabung - 08/14/2020 / 11:24 pm - cam FLIR Magma Indonesia

Sinabung - 08/14/2020 / 11:24 pm - cam FLIR Magma Indonesia

During the last 24 hours, 36 exhalations have been identified with Popocatépetl, some accompanied by volcanic gases and sometimes small amounts of ash.

In addition, 189 minutes of low amplitude tremor were recorded, most of it since a tremor episode that began on August 14 at 7:25 a.m., accompanied by an emission of ash from a height of 600 m above. above the crater; the ash emission then continued.

Ash falls are possible in my municipalities of Amecameca, Chalco, Atlautla, Ozumba, Cocotitlan and Tlalmanalco.

During the night, the volcano was partially visible, and a constant emission of volcanic gases and an incandescence above the crater could be observed.

 

The Popocatépetl remains on alert Amarilla Fase 2.

 

Sources: Cenapred, CNPC and webcams of Mexico

 Popocatépetl - emissions  from 08/14/2020 / 7:22 a.m. - WebcamsdeMexico

Popocatépetl - emissions from 08/14/2020 / 7:22 a.m. - WebcamsdeMexico

Popocatépetl - emissions  from 08/14/2020 / 8:38 am - WebcamsdeMexico

Popocatépetl - emissions from 08/14/2020 / 8:38 am - WebcamsdeMexico

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