Earth ChangesLargest earthquake swarm ever recorded at massive US volcano Posted on August 13, 2025 by Administrator Over 1,000 earthquakes have rocked Washington’s Mount Rainier in the largest ever seismic swarm recorded at this active volcano, waiting to erupt. Experts from the US Geological Survey (USGS) revealed that this record-breaking earthquake swarm started on July 8 and has continued ever since. As of July 25, geologists have recorded at least 1,010 small earthquakes around the mountain, which is one of the most dangerous volcanoes in the US.