Report on Awu (Indonesia) — 20 November-26 November 2002
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 20 November-26 November 2002
Managing Editor: Gari Mayberry
Please cite this report as:
Global Volcanism Program, 2002. Report on Awu (Indonesia). In: Mayberry, G (ed.), Weekly Volcanic Activity Report, 20 November-26 November 2002. Smithsonian Institution and US Geological Survey.
3.689°N, 125.447°E; summit elev. 1318 m
All times are local (unless otherwise noted)
VSI increased the Alert Level at Awu on 15 November following an increase in seismicity. Normally four earthquakes occur per day at the volcano, but 32 volcanic earthquakes were recorded on 15 November during 0000-0900. No surface changes were observed around the volcano's summit.
Geologic Background. The massive Gunung Awu stratovolcano occupies the northern end of Great Sangihe Island, the largest of the Sangihe arc. Deep valleys that form passageways for lahars dissect the flanks of the volcano, which was constructed within a 4.5-km-wide caldera. Powerful explosive eruptions in 1711, 1812, 1856, 1892, and 1966 produced devastating pyroclastic flows and lahars that caused more than 8000 cumulative fatalities. Awu contained a summit crater lake that was 1 km wide and 172 m deep in 1922, but was largely ejected during the 1966 eruption.