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Anatahan seismic station goes offline
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Posted on Aug 28 2005
Agencies monitoring the ongoing volcanic eruption on Anatahan lost seismic data transmission from the island since Saturday noon. The cause of the signal loss has yet to be ascertained.
The Emergency Management Office and the U.S. Geological Survey yesterday advised other agencies concerned that they did not have any updated seismic data for Anatahan.
Before the signal loss, they said volcanic tremor levels ranged between 20 and 65 percent of peak levels. Long-period earthquakes occasionally occurred.
The agencies said the signal loss began at about 12:05pm Saturday. They said they are troubleshooting to find out the nature of the problem.
“Originally, we thought the signal loss was due to the ash cloud traveling between the transmitting [Anatahan] and receiving [Saipan] stations,” the agencies stated in yesterday’s report.
Yesterday morning, they said ash plume rose to 12,000 feet and moved northerly from Anatahan, citing satellite monitoring by the Air Force Weather Agency. They said the ash plume extended about 150 nautical miles north of Anatahan.
The Washington Volcanic Ash Advisory Center reported ash plume to be at the same altitude by noontime, but said it extended to the north-northeast.
