Mount Semeru Erupts Again Tonight (Thursday, October 2, 2025)

Mount Semeru in East Java erupted again on Thursday (2/10/2025) at 18:22 WIB. In the last week, Mount Semeru has erupted 25 times.

Based on eruption information from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the height of the observed ash column reached None meters above the peak or None meters above sea level.

Visual eruption was not observed. The eruption was recorded on a seismograph with a maximum amplitude of 22 millimeters and a duration of 154 seconds.

(Read: 10 Countries with the Most Earthquakes in 2023, Indonesia Ranks First)

According to MAGMA Indonesia's volcano activity report, Mount Semeru's activity level is at Level II (Alert). Seismicity observations on October 2, 2025, from 00:00-23:59 WIB showed 81 eruption/explosion earthquakes with amplitudes of 11-22 millimeters and earthquake durations of 59-193 seconds.

Subsequently, 2 rockfall earthquakes with amplitudes of 3-4 mm and durations of 42-93 seconds, and 7 exhalation earthquakes with amplitudes of 3-8 millimeters and durations of 43-63 seconds occurred.

PVMBG urges against any activity in the southeast sector along Besuk Kobokan, as far as 8 kilometers from the peak (eruption center). Beyond that distance, people should not engage in activities within 500 meters from the riverbanks (river boundaries) along Besuk Kobokan due to the potential for expansion of hot clouds and lava flows up to 13 kilometers from the peak.

Throughout 2025, MAGMA Indonesia has recorded 6,505 volcano eruptions across Indonesia. Mount Semeru in East Java has erupted the most with 2,547 eruptions.

(Read: Number of Earthquake Victims in Indonesia in 2020-2024)