The fault responsible for this earthquake dips under Japan, starting at the Japan Trench indicated by the barbed line, the point of contact between the subducting Pacific Plate and the overriding Okhotsk Plate.
The magnitude of fault slip is indicated by the colour and the contours, at 8-meter intervals.
The question mark indicates the general region where researchers currently lack information about future seismic potential.
Credit: Mark Simons/Caltech Seismological Laboratory
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