Volcanic activity at Mount Semeru in East Java surged again on Monday morning. According to a report from the Mount Semeru Observation Post, the highest mountain on the island of Java spewed volcanic ash 1 kilometer above its peak at 05:13 WIB.
The observed ash column was thick gray, spreading towards the north. Seismograph data recorded that this eruption had a maximum amplitude of 22 millimeters with a tremor duration of 167 seconds. To date, the volcano's alert status remains at Level III (Alert).
Authorities strictly urged the public to stay away from affected areas, especially along river basins originating from Semeru's peak, such as Besuk Kobokan, Besuk Bang, Besuk Kembar, and Besuk Sat. The main threats to watch out for include pyroclastic flows, lava avalanches, and cold lava floods.
In addition to primary eruption threats, a special warning was issued for sand miners around the slopes. The Lumajang Regency Government warned of the risk of secondary explosions caused by volcanic material that still retains intense heat despite appearing calm on the surface.
The risk of secondary explosions is predicted to increase significantly, especially during rainfall in the summit area. Rainwater coming into contact with hot material can trigger dangerous reactions, so activities in sand mining zones must be suspended to minimize potential casualties.
