"Based on observation, (Mount Merapi) released 11 times incandescent lava that flowed up to 800 meters to the southwest," Head of the Geological Disaster Technology Research and Development Center (BPPTKG) Hanik Humaida noted in a written statement here on Monday.
During the observation period, Mount Merapi also recorded 30 earthquakes, with an amplitude of 3-8 mm and a duration of 11-67 seconds, as well as two phase earthquakes, with an amplitude of 3-8 mm and lasting for 7.1-7.2 seconds.
No smoke billowed from the crater at the mountain's peak during the observation period.
Weather conditions around the mountain were sunny and overcast. Moderate winds blew to the southeast, with air temperatures of 19-21 degrees Celsius, humidity of 73-90 percent, and air pressure of 872-916 mmHg.
The BPPTKG continues to maintain the alert status of Mount Merapi at Level III.
Mount Merapi’s lava and searing clouds are projected to affect areas in the south to the southwest, comprising Sungai Kuning, Boyong, Bedog, Krasak, Bebeng, and Putih.
In the meantime, Mount Merapi's volcanic material could flow as far as three kilometers from the mountain's peak