Merapi volcano (java, Indonesia), activity update: dome growing, weak pyroclastic flows
Pyroclastic flow at Merapi volcano
After a period of heightened activity during and following the 27 May, 2006, earthquake that took more than 6000 lifes in the Yogyakarta area, Merapi continues to emit glowing avalanches and pyroclastic flows travelling up to 2-3 km from the summit.
Summary for the past week (GVP/USGS weekly activity report 24-30 May, 2006):
The Alert Level at Merapi remained at 4, the highest level, during 24-30 May. On 24-25 May, lava flows were observed moving SW towards the Krasak River and SE towards the Gendol River. According to news reports, on 27 May a M 6.3 earthquake that killed about 5,400 resulted in a three-fold increase in activity at Merapi. According to CVGHM, an M 5.9 earthquake coincided with pyroclastic flows of unknown origin that extended 3.8 km SW toward the Krasak River. During 28-30 May, multiple pyroclastic flows reached a maximum of 3 km SE toward the Gendol River and 4 km SW toward the Krasak and Boyong Rivers. Gas plumes reached a height above the volcano of 500 m (11,300 ft a.s.l.) on 25 May, 1,200 m (13,600 ft a.s.l.) on 26 May, 100 m (10,000 ft a.s.l.) on 29 May, and 900 m (12,600 ft a.s.l.) on 30 May.
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