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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
 Ulawun - eruption of 03.08.2019 - photo Christopher Lagisa, via IICSV / Twitter

Ulawun - eruption of 03.08.2019 - photo Christopher Lagisa, via IICSV / Twitter

Several eruptive episodes have been reported by VAAC Darwin at Ulawun, located on New Britain in Papua New Guinea.

A first ash dispersion report shows a plume rising to 7.6 km asl at 1h50 UTC. The aviation code is red.

At 9:53 UTC, the satellite images detect a new episode, accompanied by an ash plume at 15,200 meters (50,000 feet).

At 10:15 UTC, the plume is reported at a height of 19,200 meters asl. (63,000 feet) and became stratospheric; the ashes move towards the southwest.

At 14:21 UTC, the VAAC Darwin plume reaching flight altitude 630 is detached from the volcano and moves south; at 550, the extension is radial, and mainly to the southeast, under the influence of a layer where the wind blows towards the northeast. The rash seems to have stopped.

A thermal anomaly of 75 MW VRP is reported by Mirova on 3 August at 3:35.

According to local observers, the noise of the explosion was very strong, and the ash debris "considerable" in areas near the volcano.

 

This episode follows closely the stratospheric eruption of June 26, 2019, which caused the evacuation of many inhabitants, of which according to the United Nations in PNG, more than 7000 remain since displaced. RVO reports scattered white plumes at the top of the volcano between July 1 and 4, and July 8-9 (GVP - http://volcano.si.edu/showreport.cfm?doi=GVP.WVAR20190703-252120 )
 

Sources: VAAC Darwin, VAAC Wellington, RVO, IICSV, The Watchers, Global Volcano Program

Ulawun - situation in Papua New Guinea and development of the SO2 cloud on a Himawari RGB image / via The Watchers - one click to enlarge

Ulawun - situation in Papua New Guinea and development of the SO2 cloud on a Himawari RGB image / via The Watchers - one click to enlarge

Ulawun - volcanic ash advisory for 03.08.2019, respectively at 11.20 and 14.21 - Doc. VAAC Darwin - a click to enlargeUlawun - volcanic ash advisory for 03.08.2019, respectively at 11.20 and 14.21 - Doc. VAAC Darwin - a click to enlarge

Ulawun - volcanic ash advisory for 03.08.2019, respectively at 11.20 and 14.21 - Doc. VAAC Darwin - a click to enlarge

Block and ash avalanches continue at the summit dome of Merapi / Java.

The BPPTKG reports for this August 4 at 8:41 WIB an avalanche sliding over 900 meters to Kali Gendol; its imprint on the seismogram is of max. 35 mm and a duration of 90 seconds.

 

Source: BPPTKG

Merapi - the dome 04.08.2019 / 8h42 - photo BPPTKG

Merapi - the dome 04.08.2019 / 8h42 - photo BPPTKG

Merapi - activity summary of the 03.08.2019 / 00-24h WIB - Doc.BPPTKG

Merapi - activity summary of the 03.08.2019 / 00-24h WIB - Doc.BPPTKG

Two explosions, probably phreatomagmatic or phreatic, occurred at Anak Krakatau on August 3rd at the beginning of the day, at 1:16 am (lasting 53 seconds) and 2:39. They were detected by the seismic network and not observed directly due to poor visibility.

The aviation code is orange.

 

Source: Magma Indonesia

Anak Krakatau - Sentinel 2A L1C custom script from 03.08.2019 / in the day - Doc.Copernicus

Anak Krakatau - Sentinel 2A L1C custom script from 03.08.2019 / in the day - Doc.Copernicus

At Kerinci, explosive activity continues, according to VAAC Darwin, which reports a plume of ash at 4,300 meters altitude moving west over 15 km.

The aviation code is orange.

 

Source: VAAC Darwin

 Kerinci - image Sentinel 2 of 02.08.2019 - Doc.Copernicus

 Kerinci - image Sentinel 2 of 02.08.2019 - Doc.Copernicus

The VAAC Darwin issued on August 4, 2019 at 5:20 am a notice of ash dispersion for Awu / North Sulawesi.

The ashes move northward on the Himawari-8 / visible and RGB satellite images.

The plume remains weak.

The aviation code is orange.

 

Source: VAAC Darwin

Awu / North Sulawesi - Volcanic ash advisory 04.08.2019 - Doc. VAAC Darwin

Awu / North Sulawesi - Volcanic ash advisory 04.08.2019 - Doc. VAAC Darwin

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