Mount Semeru, located on the border of Lumajang and Malang Regencies, East Java, continues to show high fluctuations in volcanic activity. To date, the 3,676-meter-above-sea-level (masl) volcano remains at Level III (Alert) status, with seismic activity dominated by continuous eruption earthquakes.
According to reports from the monitoring post on Thursday, the highest mountain on the island of Java recorded at least seven consecutive eruptions between 00:42 and 06:15 WIB. The eruptions spewed volcanic ash columns ranging between 700 and 1,100 meters above the crater peak.
During the observation period early Thursday morning from 00:00 to 06:00 WIB, officials recorded 15 eruption earthquakes with amplitudes of 13-22 mm lasting up to 158 seconds. In addition, five avalanche earthquakes, three gust earthquakes, one harmonic tremor, and two distant tectonic earthquakes were recorded, indicating that magma movement within the volcano remains highly dynamic.
This high intensity continues the volcanic trend from the previous day. Throughout Wednesday, 66 eruption earthquakes were recorded shaking Semeru. In fact, this activity triggered one pyroclastic flow lasting 187 seconds, followed by dozens of avalanche and gust earthquakes.
In response to these vulnerable conditions, relevant authorities have urged the public, especially sand miners along the riverbanks, to adhere to safety recommendations. Residents are strictly prohibited from engaging in any activity in the southeastern sector along Besuk Kobokan up to 13 kilometers from the eruption center to avoid the threat of volcanic material hazards.
