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Earthquake Activity, May 23-24, 2013

May 24, 2013

Murmurs from the Earth...

Several strong earthquakes registered on my seismograph in northeastern Ohio during the past 24 hours or so.  Because our internet was down during that time, the “Live Seismograph” was not working.  For readers who watch these things, I thought I would do a brief summary of the activity.

The Magnitude 8.3 earthquake, which occurred at 05:44:49 UTC, in the Sea of Okhotsk dominates the helicorder display. Ordinarily the great depth of the focus, 601 km, would generate relatively small surface waves but the large magnitude cause those phase to still dominate my display.   Note that the travel time curves below automatically scale the trace in a way that the amplitude cannot be compared between them.

A second, Magnitude 6.8 earthquake occurred in the same vicinity about 9 hours later (14:56:31 UTC) also at a depth of more than 600 km:

The first earthquake of May 24th that registered on my seismograph…

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