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LAKE BECHAROF SEISMIC SWARM
During the past week, the anomalous seismic activity under SW Lake Becharof continued but at a decreased rate and intensity; magnitudes of a dozen locatable earthquakes ranged from M1.7 to M3.3. If the decrease in the number and magnitude of earthquakes continues to decline, Lake Becharof will be removed from our next update. However, AVO will continue to closely monitor the situation.
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, and near the southern end of the Bruin Bay fault.
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.