An earthquake swarm that started at Mount Rainier on July 8, 2025, is the most significant seismicity at the volcano since 2009.
An earthquake swarm began at Mount Rainier, Washington, at 1:29 a.m. PDT (08:29 UTC) on July 8, 2025. An earthquake swarm is a cluster of earthquakes occurring in the same area in rapid succession. Currently, there is no indication that the level of earthquake activity is cause for concern, and the alert level and color code for Mount Rainier remain at GREEN / NORMAL.
The Pacific Northwest Seismic Network is in the process of looking at each earthquake and identifying its location, depth and size, if possible. This process is called locating. Some earthquakes are too small to locate. You can follow along in that process and watch the data on their website https://pnsn.org/volcanoes/mount-rainier.
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Source: https://www.usgs.gov/observatories/cvo/news/monitoring-stations-detect-small-magnitude-earthquakes-mount-rainier
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