Report on Soputan (Indonesia) — November 2003

Bulletin of the Global Volcanism Network, vol. 28, no. 11 (November 2003)
Managing Editor: Edward Venzke.

Soputan (Indonesia) Avalanche earthquakes and small white gas plumes

Please cite this report as:

Global Volcanism Program, 2003. Report on Soputan (Indonesia). In: Venzke, E (ed.), Bulletin of the Global Volcanism Network, 28:11. Smithsonian Institution. http://dx.doi.org/10.5479/si.GVP.BGVN200311-266030.

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Soputan

Indonesia

1.112°N, 124.737°E; summit elev. 1785 m

All times are local (unless otherwise noted)


Seismic activity recorded at Soputan during November was dominated by avalanche earthquakes (table 5). Frequent ash explosions occurred during July and on 31 August, when a lava flow was also seen (BGVN 28:08). Only a white gas plume reaching heights of 25-50 m was observed during 27 October-30 November. The hazard status of the volcano remained at Alert Level 2 (on a scale of 1-4).

Table 5. Seismicity at Soputan, 27 October-30 November 2003. Courtesy of VSI.

[Skip text table]
    Date (2003)       Avalanche      Tectonic
                     Earthquakes    Earthquakes

    27 Oct-02 Nov         51              5
    03 Nov-09 Nov         35             18
    10 Nov-16 Nov         24             17
    17 Nov-23 Nov         37              7
    24 Nov-30 Nov         66             10

Geologic Background. The Soputan stratovolcano on the southern rim of the Quaternary Tondano caldera on the northern arm of Sulawesi Island is one of Sulawesi's most active volcanoes. The youthful, largely unvegetated volcano rises to 1784 m and is located SW of Riendengan-Sempu, which some workers have included with Soputan and Manimporok (3.5 km ESE) as a volcanic complex. It was constructed at the southern end of a SSW-NNE trending line of vents. During historical time the locus of eruptions has included both the summit crater and Aeseput, a prominent NE-flank vent that formed in 1906 and was the source of intermittent major lava flows until 1924.

Information Contacts: Dali Ahmad, Hetty Triastuty, Nia Haerani, and Suswati, Volcanological Survey of Indonesia (VSI), Jalan Diponegoro No. 57, Bandung 40122, Indonesia (Email: dali@vsi.esdm.go.id, URL: http://www.vsi.esdm.go.id/).