Report on Sarigan (United States) — 10 August-16 August 2005
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 10 August-16 August 2005
Managing Editor: Gari Mayberry
Please cite this report as:
Global Volcanism Program, 2005. Report on Sarigan (United States). In: Mayberry, G (ed.), Weekly Volcanic Activity Report, 10 August-16 August 2005. Smithsonian Institution and US Geological Survey.
16.708°N, 145.78°E; summit elev. 538 m
All times are local (unless otherwise noted)
A seismic swarm was recorded at Sarigan beginning on 9 August. By 14 August, 630 earthquakes had been recorded.
Geologic Background. Sarigan volcano forms a 3-km-long, roughly triangular island. A low truncated cone with a 750-m-wide summit crater contains a small ash cone. The youngest eruptions produced two lava domes from vents above and near the south crater rim. Lava flows from each dome reached the coast and extended out to sea, forming irregular shorelines. The northern flow overtopped the crater rim on the north and NW sides. The sparse vegetation on the flows indicates they are of Holocene age (Meijer and Reagan, 1981).