The distribution of earthquakes with regard to location and deth of focus

Earth has (7?)tetonic plates. The epi center of many earthquakes occur
close to the fault lines that mark the boundries of these plates.
Typically the strongest shaking is felt close to the fault line that
shifted, but strong effects up to (60?) miles = 100 kilometers are not
unusual in some direction. The energy is transmitted more readily
though some kinds of rock stata than others. The fault line extends as
much as 60 miles = (100?) kilometers below the surface and can vary
considerably from staight toward the center of the Earth = not
necessarily vertical.
 Larger Earthquakes often do not occur the same time as volcanic
eruptions, but they are related as most volcanoes are located within
(Hawii, Yellowstone National park and Iceland seem to be exceptions)
(60?) miles = (100?)kilometers of an active fault line. Very violent
volcanoes can produce strong seismic signals only slightly different
than the more common Earthquakes.
 Near the center of the Pacific Ocean is a subduction zone, where the
sea bottom is sinking into the bowels of the Earth. If this produces
any strong Earthquakes or tidel waves = tsunami these usually are
unoticed, or perhaps mis-identified. Please comment, refute and/or
embellish.    Neil

Since it may take more than a few minutes, or even hours to correctly
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Also, could we have more detail about what you are looking for with
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Nenna-GA
Google Answers Researcher

The Pacific Northwest Earthquake Research Center is one of a number of
web pages that has exactly the type of data that you're seeking:
http://www.geophys.washington.edu/SEIS/EQ_Special/pnwtectonics.html

Best regards,

Omnivorous-GA