| | NMI/USGS Volcanic Activity Notice
Volcano: Ahyi (VNUM #284141)
Current Volcano Alert Level: ADVISORY
Previous Volcano Alert Level: UNASSIGNED
Current Aviation Color Code: YELLOW
Previous Aviation Color Code: UNASSIGNED
Issued: Friday, April 25, 2014, 5:46 PM AKDT (20140426/0146Z)
Source: U.S. Geological Survey
Notice Number: 2014/N1
Location: N 20 deg 25 min E 145 deg 1 min
Elevation: -449 ft (-137 m)
Area: Mariana Islands
Volcanic Activity Summary: Starting at 06:35 24 April ChST (20:35 23 April UTC), seismic stations on Pagan, Sarigan, Anatahan and Saipan began recording signals believed to be from an undersea volcanic source. Hydroacoustic sensors on Wake Island suggest that the source of this seismic activity is at or near Ahyi seamount. We cannot locate precisely the source of the activity and it is possible that the vent is one of the other volcanic seamounts in the area.
Seismic activity is ongoing at this time. Satellite images show nothing out of the ordinary and we have received no reports of activity at the ocean's surface.
Recent Observations:
[Volcanic cloud height] Unknown
[Other volcanic cloud information] Unknown
Remarks: Ahyi seamount is a large conical submarine volcano that rises to within 137 m of the sea surface about 18 km SE of the island of Farallon de Pajaros (Uracas) in the northern Marianas. Water discoloration has been observed over the submarine volcano, and in 1979 the crew of a fishing boat felt shocks over the summit area followed by upwelling of sulfur-bearing water. On April 24-25, 2001 an explosive submarine eruption was detected seismically from a seismic station on Rangiroa Atoll, Tuamotu Archipelago. The event was well constrained (+/- 15 km) at a location near the southern base of Ahyi; the summit of the seamount lies within the location uncertainty.
Contacts:
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