http://www.pnsn.org/req2/ E.g., - Thousands of tiny quakes preceed the erruption of Mt. St. Helens seven years ago as magma was being pushed upward from deep below. As they were then, scientists say these quakes are also shallow, but not necessarily a warning sign of anything immediate.
"It helps seeing these types of events over, in my case, decades," said University of Washington seismologist Steve Malone.
Seismologists are also watching Eastern Washington, where there have been at least four earthquakes in the last few days around a small area on the Columbia River just north of Richland.
Coincidentally, a 3.4 magnitude quake struck that area the same day as the Ashford quake near Mount Rainier. However, scientists say the two swarms are not connected.
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