Most of the Earth's seismicity is understood in terms of the major elements of plate tectonics (Cox and Hart 1986). Interaction of plates at spreading ridges, transform faults, and subduction zones controls most of the strain accumulation that gives rise to earthquakes (Turcotte and Schubert 1982). The earthquakes themselves are the products of complex physical processes involving friction and fracture mechanics that ultimately result in the release of elastic energy, some of which is released through seismic wave radiation (Kanamori 1977; Rice 1980; Kanamori et al. 1998; McGarr 1999; Abercrombie et...

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