Magnitude 7.6 – TONGA REGION

tonga031909

The USGS travel time calculator gives an epicentral distance of 106.64 degrees from the epicenter to our location in northeastern Ohio.  The fit by eye, mainly using P and PP arrivals, using AmaSeis II shown above gave 106.4 degrees.

Revised by USGS from Magnitude 7.9 to Magnitude 7.6.

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2 thoughts on “Magnitude 7.6 – TONGA REGION

  1. Dave,

    I think she is probably right. My mind’s eye of volcanic activity sees magma plumes that are mostly vertical and usually within a radius of less than ten of miles. I don’t agree with her use of the term unrelated. They are related in that they both lay on the same subduction zone and are both caused by slip on the fault, slow and deep in the case of the volcano, fast and shallow for the earthquake. But relatedness doesn’t imply causality.

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