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Deep focus earthquake From Wikipedia, the free encyclopedia
A deep-focus earthquake is an earthquake that occurs at depths between 300 and 700 km beneath the Earth's surface. Their cause is still not entirely understood since subducted lithosphere at that pressure and temperature regime should not exhibit brittle behavior. They are believed to be associated with mineralogical phase changes within the slab, such as olivine transforming into a more compact spinel structure. Deep focus earthquakes usually occur within subduction zones at oceanic-continental convergent boundaries.
The deepest earthquake ever recorded is 705 km deep, under the Fiji Islands in the Southwest Pacific, on 6 May 2007.
Originally posted by Anmarie96
This one is odd and out of place
3.7 2010/05/24 07:27:06 33.386 -109.150 5.0 41 km ( 25 mi) NNE of Morenci, AZ