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Earthquake shakes Northern Islands
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Posted on Nov 24 2005
An earthquake with a magnitude of 5.8 occurred in the Northern Islands, but Anatahan Volcano’s seismicity remains at background levels, according to the Emergency Management Office and the U.S. Geological Survey.
In their Anatahan Volcano update report released on Tuesday, EMO and USGS said the 5.8-intensity tremblor occurred 160 miles north of Uracas on Wednesday last week at 9:01am.
Citing a report from the National Earthquake Information Center, the agencies said two other 4-plus intensity quakes were recorded 260 miles north northwest of Uracas in the Volcano Islands.
Microseismicity has returned to the Sarigan area, the agencies said, adding that conservatively there were 35 quakes that have been counted with the maximum number events in a 24-hour period of microearthquakes occurring on that day.
The report mentioned that small long-period tremblors occur sparsely.
On average the other days had two to five events, the agencies said.
Satellite imagery has not indicated visible ash emissions from Anatahan since Sept. 3, 2005. For the week ending last Monday, Anatahan has not produced significant amounts of ash, the EMO and USGS said.
The strongest historical eruption happened last April 6 when the volcano reportedly spewed out ash to 50,000 feet. The volume of ash emissions in that eruption was estimated at 50 million cubic meters. (Ferdie de la Torre)
