Archived Updates

Anatahan Volcano Update
Submitted Tuesday, February 10, 2004 at 1200 local Anatahan time

Volcanic earthquakes remained essentially non-existent again today, and the amplitude of low frequency tremor remained at about yesterday's level, i.e. between the background level of January and peak level of February 5-7.

Anatahan Volcano Update
Submitted Wednesday, February 11, 2004 at 1100 local Anatahan time

The episode of volcanic earthquakes from February 1 to 8 appears to have ended for now. Also, what appeared to be low frequency tremor during the last couple of days was mostly caused by inclement weather, not the volcano.

Anatahan Volcano Update
Submitted Thursday, February 12, 2004 at 1200 local Anatahan time

For the past day, Anatahan volcanic seismicity has been very low, at levels similar to the month of January. There were no apparent eruption signals or precursory events. Tremor and seismic energy release are at very low levels.

Anatahan Volcano Update
Submitted Friday, February 13, 2004 at 1100 local Anatahan time

For the past day, Anatahan volcanic seismicity has been very low, at a level similar to that during January. There were no apparent eruption signals or precursory events. Tremor and seismic energy release are at very low levels.

Anatahan Volcano Update
Submitted Saturday, February 14, 2004 at 1000 local Anatahan time

Volcanic seismicity occurred again yesterday during a 6-hour period, the first such seismicity since the episode of February 2-7. Short tremor episodes began at 0543 and occurred every 8-12 minutes until 1130 on the 14th. The largest was approximately equivalent to a magnitude M 2 earthquake. Since 1130 no more tremor episodes have been recorded.

Anatahan Volcano Update
Submitted Sunday, February 15, 2004 at 1300 local Anatahan time

For the past day, Anatahan volcanic seismicity has been very low, at a level similar to that in January. There were no apparent eruption signals or precursory events. Tremor and seismic energy release are at very low levels.

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