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Report on Gede-Pangrango (Indonesia) — May 1991


Gede-Pangrango

Bulletin of the Global Volcanism Network, vol. 16, no. 5 (May 1991)
Managing Editor: Lindsay McClelland.

Gede-Pangrango (Indonesia) Brief earthquake swarm

Please cite this report as:

Global Volcanism Program, 1991. Report on Gede-Pangrango (Indonesia) (McClelland, L., ed.). Bulletin of the Global Volcanism Network, 16:5. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN199105-263060



Gede-Pangrango

Indonesia

6.77°S, 106.965°E; summit elev. 3008 m

All times are local (unless otherwise noted)


Three shocks were felt (intensities I-III) on 30 April. Seismicity later returned to normal levels (10-15 events/day) during the second week of May (table 1).

Table 1. Number of earthquakes at Gede, May 1991. Courtesy of VSI.

Dates Deep Volcanic (VT) Shallow Volcanic Tectonic
01-04 May 1991 22 51 47
05-11 May 1991 197 635 9
12-18 May 1991 8 16 20
19-25 May 1991 23 8 9
26-31 May 1991 9 8 13

Geological Summary. The two peaks of the Gede-Pangrango volcanic complex overlook the major cities of Cianjur, Sukabumi, and Bogor are situated to the E, S, and NW, respectively. The summit of Gunung Pangrango, constructed over the NE rim of a 3 x 5 km caldera, forms the high point. Many lava flows are visible on the flanks of the younger Gunung Gede to the SE of Pangrango. The steep-walled summit crater has migrated about 1 km NNW over time. Two large debris-avalanche deposits on its flanks, one of which underlies the city of Cianjur, record previous large-scale collapses. Activity recorded since the 16th century has typically consisted of small short explosive eruptions.

Information Contacts: W. Modjo, VSI.