August 21, 2025 | 03:37 pm
TEMPO.CO, Jakarta - Mount Semeru in East Java erupted three times on Thursday, August 21, 2025. The Geological Agency of the Ministry of Energy and Mineral Resources reported a surge in volcanic activity of the 3,676-meter-high mountain above sea level.
The mountain, located on the border between Lumajang Regency and Malang Regency, erupted at 05:31 a.m. local time, spewing volcanic ash with a column height of up to 800 meters above the crater. "The ash column is a grayish white leaning southwest," said the Semeru Volcano Observation Post (PGA) officer, Liswanto, in a report shortly after the eruption.
A stronger eruption occurred around 05:48 a.m., with the ash column reaching 1 kilometer high above the crater. Liswanto stated that seismograph recordings showed a maximum eruption amplitude of 22 millimeters with an eruption time of about 1 minute and 57 seconds.
At 06:58 a.m., the highest mountain on Java Island erupted again with a volcanic ash column height of 800 meters from the crater. "This eruption was recorded on the seismograph with a maximum amplitude of 21 millimeters and a duration of 150 seconds," he said.
Mount Semeru is now on volcanic alert Level II. The Geological Agency urges people to refrain from activities within an 8-kilometer radius of the eruption center, specifically along Besuk Kobokan. "Beyond this distance, people should not engage in activities within 500 meters from the riverbanks along Besuk Kobokan," said Liswanto.
Additionally, residents are also barred from engaging in activities within a 3-kilometer radius of the crater of Mount Semeru due to the risk of pyroclastic flow. "Beware of the potential for hot clouds and lava flows along the river or valley originating from the summit of Mount Semeru," he added.
Editor’s Choice: Mount Semeru Erupts 11 Times in a Day, Ash Column Reaches 1.2 Kilometers
Click here to get the latest news updates from Tempo on Google News
Indonesia's Mount Lewotobi Laki-Laki Still Has Potential for Explosive Eruption, Says Geological Agency
2 jam lalu
Indonesia's Geological Agency warns about the potential of a dangerous eruption from Mount Lewotobi Laki-Laki.
Mount Lewotobi Laki-Laki Erupts, Ash Column Reaches 8 Kilometers High
2 hari lalu
The Geological Agency still sets the status of Mount Lewotobi Laki-Laki in East Flores at Level IV or Caution, the highest level of volcano activity.
Mount Marapi Erupts, Spews Volcanic Ash 1,600 Meters High
9 hari lalu
Mount Marapi in West Sumatra erupted again on Monday morning, August 12, 2025, precisely at 08:39 a.m. Western Indonesia Time (WIB).
Mount Merapi Erupted Lava 110 Times in a Week, Tourists Warned to Stay Alert
9 hari lalu
Mount Merapi in Central Java, Indonesia, is currently still on alert status or Level III due to the volcanic activity.
Mount Dukono and Mount Ile Lewotolok in Indonesia Erupted Today
11 hari lalu
Mount Dukono, located in the northern part of Halmahera Island, North Maluku, Indonesia erupted on Sunday, August 10, 2025.
Mount Lewotobi Laki-laki Erupts Again; Cold Lava Alert Issued
12 hari lalu
Mount Lewotobi Laki-laki, which stands at 1,548 meters above sea level (masl), remains at Alert status, or Level IV, the highest alert status.
Indonesia's Mount Lewotobi Spews 10 Km High Volcanic Ash in Latest Eruption
19 hari lalu
Mount Lewotobi Laki-Laki erupted again on Friday, August 1, 2025, emitting a 10-kilometer ash cloud.
Geological Agency Warns of Mount Lewotobi's Explosive Eruption Due to Gas Blockage
26 hari lalu
The Geological Agency has maintained the alert status for Mount Lewotobi Laki-laki in East Flores, East Nusa Tenggara (NTT).
6 of the Most Dangerous Mountains in Indonesia to Hike Beyond Rinjani
26 hari lalu
Adventurous souls must balance excitement with proper preparation when tackling the most dangerous mountains in Indonesia. Discover the top 6 here.
Mount Lewotobi Laki-laki Erupts: Ash Plume Reaches 4 Kilometers High
40 hari lalu
The Geological Agency noted that Mount Lewotobi Laki-laki still has a high potential for an explosive eruption.
