A First Motion Study looks at whether the very first movement of a P-wave on a seismogram is an “up” (compression) or “down” (dilatation). By mapping this across many stations, scientists can determine if the fault was a normal, reverse ...
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A First Motion Study looks at whether the very first movement of a P-wave on a seismogram is an “up” (compression) or “down” (dilatation). By mapping this across many stations, scientists can determine if the fault was a normal, reverse ...