The volcanic ash eventually moved in northerly direction and fell on part of Nagari Lasi in Canduang subdistrict, Agam district, West Sumatra, an Antara journalist reported.
The column of volcanic ash this time had stronger pressure and was thicker than previously.
Normally, a column of volcanic ash which reached a height of 600 meters from the 2,891-meter high volcano's summit disappeared in 10-15 minutes, local resident Lembang said.
"This time the column of volcanic ash disappeared quickly in nearly five minutes. It was likely the volcanic ash was so thick that it fell quickly on the earth," he said.
Suparmo, a spokesman of the Volcanology and Geological Disaster Mitigation Center (PVBMG) in Bukittinggi confirmed the volcano spewed ash which moved 1 km in the northerly direction.
"We have not yet received a report whether or not the volcanic ash had fallen on part of Nagari Lasi, Agam district," he said.
He asked the local people living on the slope of Mount Marapi to keep vigilant because the activities of one of the active volcanoes in West Sumatra were unpredictable.
The volcano began to show signs of increased activity on August 3, 2011. Since then, authorities have declared the volcano to be on the second highest alert status.
: Nyoman Budhiana
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