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A Troubled Times member shows the exponential increase in deep quakes down to the 500 km level since 1994, using the database provided by a private organization known as The Council of the National Seismic System, working out of Berkeley, CA,which provide earthquake data and answers questions at their web site.

The search parameters used were:

catalog = CNSS
start time = yyyy/mm/dd,hh:mm:ss
end time = yyyy/mm/dd,hh:mm:ss
minimum magnitude = 3.0
maximum magnitude = 9
minimum depth = 500
maximum depth = 700
event_type = E

Researched by Kiko.