Magnitude 2.4 earthquake beneath summit of Mount Rainier at 8:45 am on September 13, 2012.

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The location and depth of the the September 13, 2012 M 2.4 are entirely consistent with past Rainier earthquakes, and such events are considered by CVO and the PNSN be part of the background “normal” level of activity at Mount Rainier.

A Magnitude 2.4 earthquake occurred beneath the summit of Mount Rainier this morning (September 13, 2012) at 08:45 AM, followed by a dozen or so aftershocks over the next ~20 minutes. According to the Pacific Northwest Seismic Network (, the M 2.4 was located beneath the north rim of East Crater at a depth of ~2.7 km. Such earthquakes, while not common, are also not unprecedented at Mount Rainier.  Earthquakes with a Magnitude greater than 2 occur about once per year on average below the Rainier summit, with the most recent being a M 2.9 on October 14, 2011, and a M 2.2 on October 25, 2011.