Sinabung erupted

On the Indonesian island of Sumatra the Sinabung erupted again. The VAAC Darwin published a VONA message, after which volcanic ash rose to a height of 9800 m. The cloud drifted in a westerly direction. In time a second cloud reached a height of 4200 m and was multiplied in eastern direction.

The volcanologists of Magma/VSI registered increased seismic activity the day before. Among the signals was a Tornillo. They detected the eruption in 2 signals with maximum amplitudes of 120 mm and 1785-2246 seconds duration. Although the eruption cloud rose higher than during the last eruption, there must not have been a much higher energy behind it. Weaker winds may have favoured the vertical rise of the volcanic ash to higher altitudes. The seismic signals indicate an eruption similar to the one on 8 August. In fact, the main eruption lasted longer than now.

The seismicity was increased in the first quarter of the day. There were 19 volcano-tectonic tremors recorded. Another Tornillo was also recorded. Tremor also occurred. In fact, it looks like the sinking has entered a new eruptive phase.

Mw 6.0 TANZANIA

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Another strong earthquake was detected by the USGS. Further details are:

Magnitude   Mw 6.0
Region   TANZANIA
Date time   2020-08-12 17:13:15.9 UTC
Location   7.37 S ; 39.89 E
Depth   15 km

Author: USGS

Mw 6.5 VANUATU

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Another strong earthquake was detected by the USGS. Further details are:

Magnitude   Mw 6.5
Region   VANUATU
Date time   2020-08-05 12:05:36.8 UTC
Location   16.14 S ; 168.08 E
Depth   181 km

Author: USGS

Mw 6.0 BISMARCK SEA

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Another strong earthquake was detected by the USGS. Further details are:

Magnitude   Mw 6.0
Region   BISMARCK SEA
Date time   2020-08-01 19:22:06.7 UTC
Location   3.28 S ; 148.63 E
Depth   10 km

Author: USGS

Mw 6.4 MINDANAO, PHILIPPINES

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Another strong earthquake was detected by the USGS. Further details are:

Magnitude   Mw 6.4
Region   MINDANAO, PHILIPPINES
Date time   2020-08-01 17:09:01.2 UTC
Location   7.33 N ; 124.13 E
Depth   473 km

Author: USGS

Mw 6.1 ALASKA PENINSULA

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Another strong earthquake was detected by the USGS. Further details are:

Magnitude   Mw 6.1
Region   ALASKA PENINSULA
Date time   2020-07-28 08:03:43.9 UTC
Location   54.93 N ; 161.29 W
Depth   40 km

Author: USGS

Iceland: inflation confirmed

The IMO confirmed the presumed inflation in the earthquake zone near the Fagradalsfjall volcano on the Reykjanes peninsula. The ground elevation has been 3 cm since the beginning of the swarm earthquake on 18 July. The magma inflation was detected by INSAR satellite images. The deformation took place mainly during the main phase of the quake activity between July 18th and 20th. The magma penetrated into a northeast-southwest striking fault zone, which was already discovered in 2017, when swarm quakes also occurred there. The deformation is considered part of a larger volcanic-tectonic reactivation event on the Reykjanes Peninsula. This not only results in ground uplift, but also in subsidence. Such subsidence has now been discovered in the area of the Svartsengi geothermal power plant. It started 2 days before the swarm earthquake at Fagradalsfjall and was probably caused by the underground run-off of magmatic fluids.

Mw 6.3 WESTERN XIZANG

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Another strong earthquake was detected by the USGS. Further details are:

Magnitude   Mw 6.3
Region   WESTERN XIZANG
Date time   2020-07-22 20:07:19.4 UTC
Location   33.16 N ; 86.84 E
Depth   10 km

Author: USGS