M7.5 – 106km WSW of Craig, Alaska

Alaska_75_Jan052013

A Major earthquake with a Magnitude of 7.5 occurred off the coast of southeastern Alaska today at 08:58:16 UT.  Initial estimates predict low property damage and loss of life due ground shaking but tsunami warnings are in effect for a long much of the coast of southeastern Alaska and British Columbia down to Vancouver Island.  The fault mechanism is shown to be a strike slip earthquake along what I think is a transform fault off the coast.  The worst tsunamis are generated by dip slip earthquakes occurring on thrust faults.

Here in Ohio, the signal from my seismograph dominates the helicorder display.  The extracted signal clearly shows the first arrivals of the P, PP, S, SS, and Love phases.  The PP and SS phases are reflections of the respective body phases off of the earth’s surface (from the inside of course).

One of my first thoughts was where the earthquake was in relation to the grounded Shell drilling rig near Kodiak Island.  My best estimate is that the rig is in a sheltered area about 725 miles west of the epicenter and probably (?) out of harms way from any tsunami.

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3 thoughts on “M7.5 – 106km WSW of Craig, Alaska

  1. ‘s your place…. your rules…. your whims. Elephants welcome. But the Whispers have been getting short shrift.

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