Mt. St. Helens earthquake frequency increasing
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Small earthquakes at the rate of one or two a minute today had seismologists keeping a close watch on Mount St. Helens.
"Standing on the rim, from what geologists tell us, would not be a good idea," said Peter Frenzen, monument scientist.
Scientists planned to fly over the 8,364-foot mountain today to test for carbon dioxide and sulfur gases, which could indicate whether magma is moving beneath the crater. They also planned to set up additional seismic sensors and global positioning devices to measure activity.