Category: Volcanology & Seismology

Estimated reading time: 3 minutes Key Takeaways The largest earthquake swarm ever recorded at Mount Rainier began on July 8, 2025, signaling unprecedented seismic activity. This seismic cluster surpasses previous swarms in both earthquake count and energy, raising scientific interest. While the activity indicates possible magma movement, it does not currently suggest an imminent eruption.…