ST. HELENS, Wash. A swarm of earthquakes were reported within the Mount St. Helens National Volcanic Monument over the past week.
The area has had nine small earthquakes sinceSaturday, ranging from magnitude 1.3 to 2.6. Scientists said the quakes occurred in the St. Helens seismic zone, which is a series of tectonic faults which runs underneath Mount St. Helens.
A spokesman at the seismology lab at the University Washington, Bill Steele, said the quakes were caused by faults and not volcanic activity. He added that they were about two miles deep, just northwest of the volcano and no one had reported that they felt the earthquakes.
The Pacific Northwest Seismic Network has detected at total of 13 earthquakes in the area since Jan. 27.
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