Report on Gede-Pangrango (Indonesia) — May 1991
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
6.786°S, 106.983°E; summit elev. 3026 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, 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 are present on its flanks, one of which underlies the city of Cianjur. Activity recorded since the 16th century has typically consisted of small short explosive eruptions.
Information Contacts: W. Modjo, VSI.
