Focal Depth 7
Focal Depth 7 : Natural Disaster. The conceptual "depth" of an earthquake focus. If determined from the first motion arrival-time data, this represents the depth of rupture initiation (the hypocenter depth). If determined from waveforms that are long compared with the fault dimension, the depth represents some weighted average of the moment release in the earthquake (the "centroid" depth See Romanowicz (2002, p. 153), and Lee and Stewart (1981, p. 130-139)
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