International Glaciospeleological Survey
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U.S. Geological Survey, Vancouver, Washington Mount St. Helens Daily Update 9/27/04 7:00 PM PDT Seismic activity has very slowly increased throughout the day. All earthquake locations are still shallow and beneath the dome. The largest earthquake recorded in the past 24 hours has been about a M1.5 and no M2 earthquakes have been detected in the past 24 hours. Cascades Volcano Observatory (CVO) crews installed GPS equipment today to monitor any ground movement on the dome, crater floor and the slopes of the volcano. Preliminary results from a gas flight late this afternoon did not detect any magmatic gas around the lava dome. |
