Anatahan Volcano Update
Anatahan Volcano Update for December 9-15
Submitted Tuesday, December 16 at 10:00 a.m. local Anatahan time
For the past week Anatahan volcanic seismicity has been very low, at
a level similar to that of the past month. There were no apparent eruption
signals or precursory events. Tremor and seismic energy release are at
a very low level.
During the entire week, numerous tiny long-period earthquakes (LPs) were
recorded on only the station near the crater, approximately one every 10 sec.
All of these events were much smaller than M 0.5, with dominant frequencies of
4-5 Hz. Also, a dozen or so tectonic events of M 3-4.2, with epicenters
roughly 40-55 km north of Anatahan, were recorded over the last couple of
days.
Contact persons:
Juan Takai Camacho, Geophysical Seismic Technician, EMO Saipan; tel:
(670) 322-9528, fax: (670) 322-7743, email: juantcamacho@hotmail.com
Ramon Chong, Geophysical Instrument Specialist, EMO Saipan; tel: (670)
322-9528, fax: (670) 322-7743, email: rcchongemo@hotmail.com
Frank Trusdell, Geologist, USGS; tel: (808) 967-8812, fax: (808) 967-8890,
email: trusdell@usgs.gov
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