Alert level raised at Asama Volcano in Japan
The Japan Meteorological Agency (JMA) raised the alert of the volcano from 1 to 2 (on a scale of 1-5), as the volcano has recently been showing growing signs of unrest – increased seismic activity and strongly elevated gas emissions.
Seismicity started to show a weak upward trend already in early 2014, but then stagnated until past April, when the number of daily,and relatively shallow (2-3 km depth) earthquakes detected rose to over 80, the highest level since the volcano had quieted down after its last eruption in 2009.
According to a news article, gas emissions (SO2) have risen from averages of 100 tons/day in May to 500 tons/day on 8 June and 1,700 tons/day yesterday.
An access restriction of 2 km around the active Kamayama crater has been put in place.
Courtesy of volcanodiscovery.com