News

This week's Volcano Watch was written by USGS Hawaiian Volcano Observatory geologist Don Swanson, who worked on Mount St. Helens before and after the...

As of May 5, the PNSN has located 47 earthquakes near Mount St. Helens since the seismic network was restored on April 21, 2017.

The current pattern of seismicity is similar to swarms most recently seen at Mount St. Helens in March-May 2016, and in 2014 and 2013. 

MEDIA ADVISORY

Twenty middle-school girls from Washington and Oregon are participating in the second annual “GeoGirls” outdoor volcano science program...

The earthquakes are volcano-tectonic in nature, indicative of a slip on a small fault. Such events are commonly seen in active hydrothermal and...

The largest earthquake was a Magnitude 0.7, an event that would not be felt even if you were standing on the surface above it.

The eroded sediments are volcanic deposits on the south-southwest side of the volcano.

USGS-Cascades Volcano Observatory geologists working in the area on August 21 observed higher sediment-laden stream flows and broad areas adjacent to...

Twenty middle school girls from Washington and Oregon are participating in “GeoGirls,” an outdoor program jointly organized by the U.S. Geological...

In the early morning hours of September 23, 2004, a swarm of small-magnitude earthquakes about half a mile below Earth’s surface marked the...