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Report on Ruang (Indonesia) — 22 June-28 June 2022


Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 22 June-28 June 2022
Managing Editor: Sally Sennert.

Please cite this report as:

Global Volcanism Program, 2022. Report on Ruang (Indonesia) (Sennert, S, ed.). Weekly Volcanic Activity Report, 22 June-28 June 2022. Smithsonian Institution and US Geological Survey.

Weekly Report (22 June-28 June 2022)



2.3°N, 125.37°E; summit elev. 725 m

All times are local (unless otherwise noted)

An increased number of deep volcanic earthquakes at Ruang in April prompted PVMBG to raise the Alert Level to 2 (on a scale of 1-4). A total of 232 deep volcanic earthquakes were recorded by the seismic network during 1 April-22 June, with just over half of them occurring in early to mid-April. No data was recorded from 18 April through 11 May due to technical difficulties. The network recorded 6-20 events during 11-31 May and just 1-2 events during 1-21 June. PVMBG lowered the Alert Level to 1 on 23 June.

Geological Summary. Ruang volcano is the southernmost volcano in the Sangihe Island arc, north of Sulawesi Island; it is not the better known Raung volcano on Java. The 4 x 5 km island volcano is across a narrow strait SW of the larger Tagulandang Island. The summit contains a crater partially filled by a lava dome initially emplaced in 1904. Explosive eruptions recorded since 1808 have often been accompanied by lava dome formation and pyroclastic flows that have damaged inhabited areas.

Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)