Sept. 2-3, 2019: Strongest Swarm In Over 2 Decades Hits Mount Shasta

Start on Sept. 1, 2019, seismicity started to increase under the ESE base of Mt. Shasta. Only a few small quakes struck not surpassing M2.1. However, on Sept. 2, three large bursts of seismicity were detected in the same location at Mt. Shasta. The entire swarm, including the 3 bursts, was not large compared to other locations around the United States. But it was a major swarm for Mount Shasta especially when Shasta rarely sees much seismicity.

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