Four moderate earthquakes in the magnitude of 4 to 5 range occurred in the Kobuk Trench of northwestern Alaska during October 1980. This is a characteristically aseismic area. All foci were of shallow depth, and focal mechanism solutions from the three largest events are consistent in indicating right-lateral displacement on a fault trending WNW-ESE. This would be in agreement with mapped faults of Quaternary age in the area.

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