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LAKE BECHAROF SEISMIC SWARM
During the past week, the anomalous seimic activity under SW Lake Becharof continued; magnitudes of 20 locatable earthquakes ranged from M1.8 to M4.3. AVO will continue to closely monitor the situation. Several overflights of the swarm location by AVO scientists revealed no signs of volcanic activity or surface breakage. The area of seismicity is currently not monitored by real-time seismic instrumentation. However, a portable seismic instrument has been installed. AVO is also in communication with local citizens and land managers who frequently overfly the area.
The initial swarm of tectonic earthquakes began at 4:30 PM ADT on Friday, May 8, 1998 with five earthquakes of M5.2 to M4.7 that shook the mid-Alaska Peninsula region, including the towns of King Salmon, Dillingham, Naknek, Egegik, and Pilot Point. Epicenters of the earthquakes are located on the SW side of Lake Becharof, approximately 10-20 km (approximately 6-12 miles) NW of Ukinrek Maars.
THERE IS NO EVIDENCE OF IMMINENT VOLCANIC HAZARD RESULTING FROM THIS SEISMIC SWARM
Seismic activity is monitored in real time at 16 volcanoes in Alaska. Some of these volcanoes may currently display anomalous seismicity, but they are not considered to be at a dangerous level of unrest.