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Tokachi volcano (Hokkaido, Japan) activity update: steaming, increased earthquake activity

za, 1 dec 2012, 11:05
11:05 AM | DOOR: T
Fumes at the Taisho crater rose to heights of up to 100 m above the crater rim, and have remained at relatively high levels since May 2010. Plume activity at the 62-2 crater has remained at low levels and a white plumes were observed rising to a height of up to 100 m above the crater rim.
Seismic activity remained at low levels in November. Volcanic earthquake activity temporarily increased from midday to the evening of December 2nd, with hypocenters located at depths of 1 km below sea level to the east of the Ground crater. Magnitude 2.2 and 2.0 earthquakes occurred at 13:37 JST and 13:49 JST on the same day.
According to reports from Biei Town and first-hand accounts collected by the Local Metrological Observatory, the first of these was felt in the Shirogane and Tokachidake hot spring areas located at the foot of the mountain, while the second was felt in the Shirogane area only. These were the first earthquakes felt in the area since June 25th,
2000. Seismic activity had decreased by the night of December 2nd. No volcanic tremors were observed during these events.
According to GPS observation data, ground deformation at Maetokachi indicating inflation of shallow parts at the 62-2 crater had continued since 2006, but this tendency may have slowed since this April. No change indicating ground deformation in deeper parts was observed.
(Source: JMA Monthly Volcanic Activity Report, November 2012)
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