Archived Updates

Anatahan Volcano Update for July 28
Submitted Tuesday July 29, 12:43 p.m. local Anatahan time

For the past 24 hours Anatahan volcanic seismicity has been low, at a level similar to that of the past couple of weeks. There were no apparent eruption signals or potential precursory events. Tremor is low. The seismic network registered a teleseism from the M6.6 earthquake near Fiji at about 0212 UTM July 27th.

Anatahan Volcano Update for July 29
Submitted Wednesday July 30, 10:30 a.m. local Anatahan time

Anatahan seismicity for the past 24 hours has been at a low level similar to that of the past couple of weeks. No significant events or tremor were reported, although background tremor is up slightly over its level on July 26.

Anatahan Volcano Update for July 30
Submitted Thursday July 31, 09:10 a.m. local Anatahan time

Anatahan seismicity for the past 24 hours  has been at a low level similar to that of the past couple of weeks. No significant events or tremor occurred.

Anatahan Volcano Update for July 31
Submitted Friday, August 1, 10:20 a.m. local Anatahan time

For the past 24 hours Anatahan volcanic seismicity has been low, at a level similar to that of the past couple of weeks. There were no apparent eruption signals or potential precursory events. Tremor is low.

Anatahan Volcano Update for August 1
Submitted Saturday, August 2, 08:20 a.m. local Anatahan time

For the past 24 hours Anatahan volcanic seismicity has been low, at a level similar to that of the past couple of weeks. There were no apparent eruption signals or potential precursory events. Tremor is low.

Anatahan Volcano Update for August 2
Submitted Sunday, August 3, 10:00 a.m. local Anatahan time

For the past 24 hours Anatahan volcanic seismicity has been low, at a evel similar to that of the past couple of weeks. There were no apparent eruption signals or potential precursory events. Tremor is low.

The Anatahan seismic station registered a small swarm of a dozen or so long-period (LP) events of approximate magnitude 1. They were not registered by either the Sarigan or Saipan seismic stations. The events mostly occurred between 2100 and 2300 August 1, local Anatahan time. We consider this small swarm to likely be part of normal background activity, not necessarily precursory to any imminent eruption. We will continue to keep an eye on the seismicity.

Anatahan Volcano Update for August 3
Submitted Monday, August 4, 09:45 a.m. local Anatahan time

For the past 24 hours Anatahan volcanic seismicity has been low, at a level similar to that of the past couple of weeks. There were no apparent eruption signals or potential precursory events. Tremor is low.

The brief swarm of small LP events registered yesterday on the Anatahan seismic station has ended. Background tremor is up slightly today, but seismic energy release is still within a level we have seen for the past couple of weeks.

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