Focal mechanisms of earthquakes provide two nodal planes. A foolproof method of identifying which one is the fault plane is the “seismologist's dream.” This is true because knowledge of causative faults is of key importance for seismotectonic studies. For example, intermediate-depth earthquakes, such as the one studied in this paper, rarely have known fault planes, but the correct interpretation of such a fault plane would help constrain regional geodynamic models of subducted plates and stress fields. It is equally important to identify active crustal blind faults, knowledge of which may improve earthquake hazard assessment.

The fault plane can sometimes be...

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