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Encyclopedia > Deep focus earthquake

A deep focus earthquake is an earthquake that occurs at depths of 600 to 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. An earthquake is a phenomenon that results from and is powered by the sudden release of stored energy that radiates seismic waves. ... The tectonic plates of the Lithosphere on Earth. ... Olivine The mineral olivine is a magnesium iron silicate with the formula (Mg,Fe)2SiO4 in which the ratio of magnesium and iron varies between the two endmembers of the series: forsterite (Mg-rich) and fayalite (Fe-rich). ... The spinels are any of a class of minerals which crystallize in the isometric system with an octahedral habit. ...


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Earthquake - Printer-friendly - MSN Encarta (883 words)
Seismologists examine the parts of an earthquake, such as what happens to the Earth’s surface during an earthquake, how the energy of an earthquake moves from inside the Earth to the surface, how this energy causes damage, and the slip of the fault that causes the earthquake.
Earthquake waves begin to radiate out from the focus and subsequently form along the fault rupture.
The properties of an earthquake depend strongly on the type of fault slip, or movement along the fault, that causes the earthquake.
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