Report on Lokon-Empung (Indonesia) — December 2003
Bulletin of the Global Volcanism Network, vol. 28, no. 12 (December 2003)
Managing Editor: Richard Wunderman.
Lokon-Empung (Indonesia) During November, elevated seismicity and a minor gas plume
Please cite this report as:
Global Volcanism Program, 2003. Report on Lokon-Empung (Indonesia) (Wunderman, R., ed.). Bulletin of the Global Volcanism Network, 28:12. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN200312-266100
Lokon-Empung
Indonesia
1.358°N, 124.792°E; summit elev. 1580 m
All times are local (unless otherwise noted)
Ongoing seismicity at Lokon was reported in BGVN 28:10. The Volcanological Survey of Indonesia (VSI) report for 27 October-30 November showed continuing seismicity (table 8), and a white gas plume rising 75-150 m from the Tompaluan crater. The volcano remained at alert level 2 (on a scale of 1-4).
Table 8. Seismicity recorded at Lokon-Empung, 27 October-30 November 2003. Courtesy of VSI.
| Date | Deep volcanic (A-type) | Shallow volcanic (B-type) | Tectonic |
| 27 Oct-02 Nov 2003 | 3 | 29 | 22 |
| 03 Nov-09 Nov 2003 | 15 | 171 | 26 |
| 10 Nov-16 Nov 2003 | 9 | 146 | 43 |
| 17 Nov-23 Nov 2003 | 22 | 96 | 20 |
| 24 Nov-30 Nov 2003 | 7 | 116 | 21 |
Geological Summary. The Lokong-Empung volcanic complex, rising above the plain of Tondano in North Sulawesi, includes four peaks and an active crater. Lokon, the highest peak, has a flat craterless top. The morphologically younger Empung cone 2 km NE has a 400-m-wide, 150-m-deep crater that erupted last in the 18th century. A ridge extending 3 km WNW from Lokon includes the Tatawiran and Tetempangan peaks. All eruptions since 1829 have originated from Tompaluan, a 150 x 250 m crater in the saddle between Lokon and Empung. These eruptions have primarily produced small-to-moderate ash plumes that sometimes damaged croplands and houses, but lava-dome growth and pyroclastic flows have also occurred.
Information Contacts: Dali Ahmad, Hetty Triastuty, Nia Haerani and Suswati, Vulcanological Survey of Indonesia (VSI), Jalan Diponegoro No. 57, Bandung 40122, Indonesia (URL: http://www.vsi.esdm.go.id/).
