Report on Ahyi (United States) — 21 May-27 May 2014
Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 21 May-27 May 2014
Managing Editor: Sally Sennert.
Please cite this report as:
Global Volcanism Program, 2014. Report on Ahyi (United States) (Sennert, S, ed.). Weekly Volcanic Activity Report, 21 May-27 May 2014. Smithsonian Institution and US Geological Survey.
20.42°N, 145.03°E; summit elev. -75 m
All times are local (unless otherwise noted)
On 23 May the USGS reported that during the previous week one explosion signal from the source at or near Ahyi seamount was detected. Seismic activity had been low since 8 May continuing to indicate that the eruption had possibly paused or ended.
Geological Summary. Ahyi seamount is a large conical submarine volcano that rises to within 75 m of the ocean surface ~18 km SE of the island of Farallon de Pajaros in the northern Marianas. Water discoloration has been observed there, and in 1979 the crew of a fishing boat felt shocks over the summit area, followed by upwelling of sulfur-bearing water. On 24-25 April 2001 an explosive eruption was detected seismically by a station on Rangiroa Atoll, Tuamotu Archipelago. The event was well constrained (+/- 15 km) at a location near the southern base of Ahyi. An eruption in April-May 2014 was detected by NOAA divers, hydroacoustic sensors, and seismic stations.