Warning! Mount Semeru Erupts Again This Morning (Wednesday, October 1, 2025)

Mount Semeru in East Java erupted again on Wednesday (October 1, 2025) at 05:31 AM Western Indonesian Time (WIB). In the last week, Mount Semeru has erupted 17 times.

Citing 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 (None meters above sea level).

The visual eruption was not observed. The eruption was recorded on a seismograph with a maximum amplitude of 21 millimeters and a duration of 129 seconds.

(Read: 5.3 M Earthquake Shakes 17 Km West of Pasuquin,)

According to MAGMA Indonesia's volcanic activity report, Mount Semeru's activity level is at Level II (Alert). Seismic observations on October 1, 2025, from 00:00-23:59 WIB, showed 63 eruption tremors/earthquakes with amplitudes of 10-22 millimeters and durations of 71-180 seconds.

Additionally, 18 exhalation tremors with amplitudes of 2-8 millimeters and durations of 31-89 seconds, as well as 1 felt earthquake, scale III MMI, with an amplitude of 30 millimeters, s-p unobserved, and a duration of 579 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, the public is advised not to engage in activities within 500 meters from the riverbanks along Besuk Kobokan, as there is a potential for expansion of hot clouds and lava flows up to 13 kilometers from the peak.

Throughout 2025, MAGMA Indonesia has recorded 6,478 volcanic eruptions across Indonesia. Mount Semeru in East Java had the most eruptions, with 2,539 occurrences.

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