Geological Disaster Technology Research and Development Center (BPPTKG) Head Hanik Humaida remarked that during the observation period, Mount Merapi had recorded 26 earthquakes, with an amplitude of 3-31 mm and a duration of 11-62 seconds.
In addition, two earthquakes with gusts at an amplitude of 4-5 mm and a duration of 13-15 seconds; five phase earthquakes, with an amplitude of 2-3 mm and a duration of five to six seconds; and one volcanic earthquakes, with an amplitude of 40 mm for 10 seconds struck the mountain.
Hot clouds rose 400 meters high from the mountain's peak amid cloudy weather conditions, while weak winds blew to the east, southeast, and west.
During the observation period on Monday from 00:00 a.m. to 24:00 p.m. local time, Mount Merapi reportedly released searing clouds once as far as 1,300 meters to the southwest and emitted incandescent lava thrice that reached as far as 700 meters to the southwest.
The BPPTKG continues to maintain the alert status of Mount Merapi at Level III.
Areas in the south to the southwest -- Sungai Kuning, Boyong, Bedog, Krasak, Bebeng, and Putih -- are projected to be affected by Mount Merapi's lava and hot clouds.
In the meantime, Mount Merapi's volcanic material could flow as far as three kilometers from the mountain's peak.