Archived Updates

Monday, August 18, 10:00 a.m. local Anatahan time

For the past 24 hours, Anatahan volcanic seismicity has remained low, at a level similar to that of the past month or so. There were no apparent eruption signals or precursory events. Tremor and seismic energy release are low.

Tuesday, August 19, 10:00 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 month or so. There were no apparent eruption signals or precursory events. Tremor and seismic energy release are low.

During the past 24 hours, more, apparently tectonic events have occurred from the same source that produced several similar events over the last week or so at about 30-45 km slant distance from the summit of Anatahan. Owing to the linear configuration of the island network, we cannot determine how shallow the events are, but they seem too far away to be related to Anatahan. One of the largest such events, of ~M3, occurred at 1609 UTC.

Wednesday, August 20, 10:00 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 month or so. There were no apparent eruption signals or precursory events. Tremor and seismic energy release are low.

A few more of tectonic-type events also occurred at 30-40 km slant-distance from Anatahan's summit, similar to those that have taken place during the last couple of weeks, also. None was larger than ~M2.

Thursday, August 21, 09:00 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 month or so. There were no apparent eruption signals or precursory events. Tremor and seismic energy release are low.

A couple more tectonic-type events occurred at 30-40 km slant-distance from Anatahan's summit. They resemble those observed over the last 2 weeks, but seem to be dying off. None was larger than ~M2.

Friday, August 22, 09:30 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 month or so. There were no apparent eruption signals or precursory events. Tremor and seismic energy release are low.

The small tectonic-type events that have occurred occasionally at 30-40 km slant-distance from Anatahan's summit have died out.

Submitted Saturday, August 23, 10:00 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 month or so. There were no apparent eruption signals or precursory events. Tremor and seismic energy release are low.

The small tectonic-type events that have occurred occasionally at 30-40 km slant-distance from Anatahan's summit have all but died out. A small event (M<2) occurred about 15-20 km from the summit.

Sunday, August 24, 10:00 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 month or so. There were no apparent eruption signals or precursory events. Tremor and seismic energy release are low.