Mount St. Helens, Washington
Summary of Mount St. Helens Seismic Activity,
January 1996


Earthquake activity beneath Mount St. Helens remained at a low level during January 1996. Fourteen small earthquakes occurred beneath the volcano during January, compared to 26 earthquakes in December 1995. This continues a trend of declining activity since October 1995. There were no explosions or other unusual events at the volcano during January.

Graphic

Caption: Cross-sectional view showing the locations of earthquakes beneath Mount St. Helens during January 1996. The cross-section represents a vertical slice of the crust downward from line A-A' in the map view. The earthquakes occurred in and around the magma conduit system that leads from the magma reservoir to the dome. In this graph, 0 depth is referenced to 1.5 km (about 1 mile) below the current summit of Mount St. Helens (8,363 feet above sea level). Data and graph provided by the Geophysics Program, University of Washington.

Graphic

Caption: Graph showing relationship between time and depth of earthquakes beneath Mount St. Helens from February 1, 1995 to January 31, 1996. In this graph, 0 depth is referenced to 1.5 km (about 1 mile) below the current summit of Mount St. Helens (8,363 feet above sea level). Data and graph provided by the Geophysics Program, University of Washington.