Report on Batur (Indonesia) — September 2001

Bulletin of the Global Volcanism Network, vol. 26, no. 9 (September 2001)
Managing Editor: Richard Wunderman.

Batur (Indonesia) White, thin plume to 10 m above crater rim during March and April 2001

Please cite this report as:

Global Volcanism Program, 2001. Report on Batur (Indonesia). In: Wunderman, R (ed.), Bulletin of the Global Volcanism Network, 26:9. Smithsonian Institution. http://dx.doi.org/10.5479/si.GVP.BGVN200109-264010.

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Batur

Indonesia

8.242°S, 115.375°E; summit elev. 1717 m

All times are local (unless otherwise noted)


During March and April 2001, a thin-white plume was observed reaching up to 10 m above the crater rim at Batur. During January through April 2001 unspecified categories of monthly earthquakes numbered 6, 10, 20, and 6, respectively; their depths were 2-5 km. Some further details on specific types of March-April earthquakes appear in table 2. Based on these data, the Volcanological Survey of Indonesia (VSI) lowered the Alert Level from 2 to 1 (on a scale of 1-4) in early May. No further activity has been reported as of September 2001.

Table 2. Seismic activity registered at Batur during March and April 2001. Courtesy of VSI.

[Skip text table]
    Date (2001)     Earthquakes

                      Deep     Shallow      Small     Tectonic
                    volcanic   volcanic   explosion
                    (A-type)   (B-type)

    06 Mar-12 Mar      --          3           5         14
    12 Mar-18 Mar       4          3           3          2
    19 Mar-23 Mar      --          1          --         10
    27 Mar-01 Apr      --         --           8          7
    02 Apr-09 Apr       1          2           5         10
    09 Apr-15 Apr       2         --           2         17
    16 Apr-23 Apr      --          1           2         10
    23 Apr-29 Apr      --         --           5         14

Geologic Background. The historically active Batur volcano is located at the center of two concentric calderas NW of Agung volcano. The outer 10 x 13.5 km wide caldera was formed during eruption of the Bali (or Ubud) Ignimbrite about 29,300 years ago and now contains a caldera lake on its SE side, opposite the satellitic cone of 2152-m-high Gunung Abang, the topographic high of the Batur complex. The inner 6.4 x 9.4 km wide caldera was formed about 20,150 years ago during eruption of the Gunungkawi Ignimbrite. The SE wall of the inner caldera lies beneath Lake Batur; Batur cone has been constructed within the inner caldera to a height above the outer caldera rim. The 1717-m-high Batur stratovolcano has produced vents over much of the inner caldera, but a NE-SW fissure system has localized the Batur I, II, and III craters along the summit ridge. Historical eruptions have been characterized by mild-to-moderate explosive activity sometimes accompanied by lava emission. Basaltic lava flows from both summit and flank vents have reached the caldera floor and the shores of Lake Batur in historical time.

Information Contacts: Dali Ahmad, 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/).