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Anatahan Volcano Updates
Anatahan Volcano Update
Submitted Friday, February 6 at 1000 local Anatahan time
After more than 5 months of very low level activity, long-period earthquakes
(LP's) began to occur at Anatahan on February 1. The events are increasing
slowly in size, now reaching about magnitude M 2, and are becoming more
frequent, up to several events per hour. These events likely result
from magma degassing and/or moving beneath the recently active crater.
The Emergency Management Office, Office of the Governor, CNMI, has
placed Anatahan Island off-limits until further notice and concludes
that, although the volcano is not currently dangerous to aircraft, aircraft
should exercise due caution in the vicinity of Anatahan.
Anatahan Volcano Update
Submitted Saturday, February 7 at 1000 local Anatahan time
The seismicity at Anatahan peaked just before 0600 UT today, with events
occurring up to 15 per hour, then decreased dramatically but remains
well above levels of the previous few months.
Anatahan Volcano Update
Submitted Sunday, February 8, 2004 at 1000 local Anatahan time
The size of the volcanic earthquakes has diminished greatly from their
peak size two days ago, but the earthquakes are now occurring more often,
sometimes as frequently as one per minute. The amplitude of low frequency
tremor has also increased considerably. The combined effect is that
the level of seismic energy release, averaged over hours, has remained
nearly constant at its peak level over the last two days.
Anatahan Volcano Update
Submitted Monday, February 9, 2004 at 1000 local Anatahan time
The size of the volcanic earthquakes decreased significantly again today,
and the earthquakes are essentially no longer visible on the records.
The amplitude of low frequency tremor remained high but decreased some
from its peak yesterday. The total daily seismic energy release decreased
somewhat today from its peak during 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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