Report on Semeru (Indonesia) — 16 March-22 March 2022
Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 16 March-22 March 2022
Managing Editor: Sally Sennert.
Please cite this report as:
Global Volcanism Program, 2022. Report on Semeru (Indonesia) (Sennert, S, ed.). Weekly Volcanic Activity Report, 16 March-22 March 2022. Smithsonian Institution and US Geological Survey.
8.108°S, 112.922°E; summit elev. 3657 m
All times are local (unless otherwise noted)
PVMBG reported that the eruption at Semeru continued during 15-22 March, though weather conditions sometimes hindered views. Daily eruptive events produced white-and-gray plumes that rose 200-800 m above the summit and drifted mainly N, W, and SW. At 0353 on 22 March a pyroclastic flow originating from the end of a lava flow descended the Kobokan drainage on the SE flank and produced an ash cloud that rose 1.5 km above summit and drifted SE. The Alert Level remained at 3 (on a scale of 1-4). The public was warned to stay at least 500 m away from Kobokan drainages within 17 km of the summit, along with other drainages originating on Semeru, including the Bang, Kembar, and Sat, due to lahar, avalanche, and pyroclastic flow hazards.
Geological Summary. Semeru, the highest volcano on Java, and one of its most active, lies at the southern end of a volcanic massif extending north to the Tengger caldera. The steep-sided volcano, also referred to as Mahameru (Great Mountain), rises above coastal plains to the south. Gunung Semeru was constructed south of the overlapping Ajek-ajek and Jambangan calderas. A line of lake-filled maars was constructed along a N-S trend cutting through the summit, and cinder cones and lava domes occupy the eastern and NE flanks. Summit topography is complicated by the shifting of craters from NW to SE. Frequent 19th and 20th century eruptions were dominated by small-to-moderate explosions from the summit crater, with occasional lava flows and larger explosive eruptions accompanied by pyroclastic flows that have reached the lower flanks of the volcano.