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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
 Stromboli - explosion of 07/19/2020 / 03:00 UTC - INGV OE webcams
 Stromboli - explosion of 07/19/2020 / 03:00 UTC - INGV OE webcams

Stromboli - explosion of 07/19/2020 / 03:00 UTC - INGV OE webcams

The Stromboli surveillance network recorded this July 19) 0300 UTCa major explosion.

The products of the explosion were distributed throughout the crater terrace and on the Sciara del Fuoco.

From the seismic point of view, the phenomenon is characterized by a brief sequence of explosions and an increase in the amplitude of the tremor up to 3:10 UTC

 

Source: Osservatorio Etneo dell'INGV.

Stromboli - 19.07.2020 - explosion at 03h00 UTC - Sismo-acoustic network - Doc.LGS

Stromboli - 19.07.2020 - explosion at 03h00 UTC - Sismo-acoustic network - Doc.LGS

In Ecuador, several ash emissions were observed in Sangay, forming plumes up to 2,000 meters high. above the summit.

VAAC Washington has reported in the past 24 hours 5 ash emissions recorded by satellite at 1,770 meters above the crater, drifting west.

The seismicity of the last 24 hours is characterized by 80 explosions and 15 LP earthquakes. The other parameters are unchanged; the alert level remains at yellow.

 

Source: IGEPN

Sangay overview of 06.25.2020 - Photo M Almeida - IGEPN

Sangay overview of 06.25.2020 - Photo M Almeida - IGEPN

Sangay - Volcanic Ash Advisory 19.07.2020 - Doc. VAAC Washington

Sangay - Volcanic Ash Advisory 19.07.2020 - Doc. VAAC Washington

The Bulusan monitoring network recorded forty-eight (48) volcanic earthquakes during the observation period of the last 24 hours. Ground deformation data from continuous GPS measurements indicates an inflation cycle followed by deflation of the building from late February 2020, while the long term trend since May 2019 indicates that the building is still deflated. These parameters indicate that volcanic processes are underway under the edifice and may be caused by deep degassing or hydrothermal activity or magmatic intrusion.

The level 1 (abnormal) alert status prevails over the Bulusan volcano, which means that it is currently in an abnormal state. Local communities and the public are reminded that entering the permanent danger zone (PDZ) within a radius of four kilometers is strictly prohibited and that vigilance in the extended danger zone (EDZ) of two kilometers in the sector southeast must be exercised due to the increased possibilities for sudden and dangerous phreatic eruptions.

 

Source: Phivolcs

Bulusan - photo C. Newhall / USGS archives

Bulusan - photo C. Newhall / USGS archives

In the Ogasawara Islands, Nishinoshima's activity continues. The ash emissions are partly masked by cloud cover.

The thermal anomalies noted by Mirova oscillate between very high and moderate, from VRP 276 to 761MW on 18.07, and from VRP 26 to 1,084 MW on 19.07.2020. The results may be obscured or attenuated by clouds.

Sentinel-5P / Tropomi reports a strong sulfur dioxide signal near Nishinoshima, with 56.99DU of SO2 at an altitude of 12.86km on July 19.

 

Sources: VAAC Tokyo, Mirova and Tropomi

 Nishinoshima - Thermal anomalies at 07/19/2020 / 01:25 - Doc. Mirova_MODIS_Latest10NTI

Nishinoshima - Thermal anomalies at 07/19/2020 / 01:25 - Doc. Mirova_MODIS_Latest10NTI

 Nishinoshima - 07/19/2020 strong sulfur dioxide signal near Nishinoshima with 56.99DU of SO2 at 12.86 km. Altitude - Doc. Sentinel-5P / Tropomi / DLR / BIRA / ESA

Nishinoshima - 07/19/2020 strong sulfur dioxide signal near Nishinoshima with 56.99DU of SO2 at 12.86 km. Altitude - Doc. Sentinel-5P / Tropomi / DLR / BIRA / ESA

 Nishinoshima - Volcanic Ash Advisory for 19.07.2020 - Doc. VAAC Tokyo

Nishinoshima - Volcanic Ash Advisory for 19.07.2020 - Doc. VAAC Tokyo

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