Report on Sangeang Api (Indonesia) – March 2022 – Indonesia

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Bulletin of the Global Volcanism Network, vol. 47, No. 3 (March 2022)
Managing Editor: Edward Venzke. Research and editing by Paul Berger.

Sangeang API (Indonesia) Small ash cloud on February 17, 2022

Please cite this report as:

Global Volcanism Program, 2022. Report on Sangeang Api (Indonesia) (Venzke, E., ed.). Bulletin of the Global Volcanism Network, 47:3. Smithsonian Institution.

Indonesia

8.2°S, 119.07°E; Summit height 1912 m

All times are local (unless otherwise noted)

Sangeang Api is a complex volcano on the small island of Sangeang in the Lesser Sunda Islands, Indonesia, composed of two volcanic cones. After a large explosion in May 2014, activity continued through November 2015, with thermal anomalies suggesting possible lava dome growth or lava flows (BGVN 39:02 and 41:10). Another eruptive period from July 2017 to June 2020 included occasional weak ash explosions with ash plumes and emissions, hot material ejected from the summit crater, periods of numerous thermal anomalies, summit glows and rare strombolian activity (BGVN 42:09, 43:11, 44 :05, 45:02 and 45:08). The volcano is monitored by Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG or CVGHM), the Darwin Volcanic Ash Advisory Center (VAAC) and by various satellites.

The only documented activity from August 2020 to February 2022 was an ash plume on February 17, 2022, reported by the Darwin VAAC, rising to an altitude of 4-4.9 km (~3 km above the summit) and SW and WSW drifted. From August 2020 to February 2022, Sentinel-2 satellite images were typically obscured by weather clouds during this period, but no thermal signals or volcanic activity were observed on clear days. From May 2021 to February 2022, the MIROVA (Middle InfraRed Observation of Volcanic Activity) volcano hotspot detection system recorded ten scattered hotspots within 5 km of the summit; the cause of the faint anomalies is unknown.

Geological Summary. One of the most active of the Lesser Sunda Islands, Sangeang Api Volcano forms a small island 13 km wide off the northeast coast of Sumbawa Island. Two large trachybasaltic to tranchyandesitic volcanic cones, Doro Api and Doro Mantoi, were constructed at the center and eastern rim, respectively, of an older, largely buried caldera. Flank vents occur on the south side of Doro Mantoi and near the north coast. Intermittent eruptions have been recorded since 1512, most of them in the 20th century.

Information contacts: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as Indonesian Center for Volcanology and Geological Hazard Mitigation, CVGHM)Jalan Diponegoro 57, Bandung 40122, Indonesia (URL: http://www.vsi.esdm.go.id/); Darwin Volcanic Ash Advisory Center (VAAC)Bureau of Meteorology, Northern Territory Regional Office, PO Box 40050, Casuarina, NT 0811, Australia (URL: http://www.bom.gov.au/info/vaac/); MIROVA (Medium InfraRed Observation of Volcanic Activity)a joint project of the Universities of Turin and Florence (Italy), supported by the Volcanic Risk Center of the Italian Ministry of Civil Protection (URL: http://www.mirovaweb.it/); Sentinel Hub Playground (URL: https://www.sentinel-hub.com/explore/sentinel-playground).

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