Abstract
The Quaternary tectonics of the inner belt of northeast Honshu (Tohoku district), Japan, and the neighboring offshore area of the Japan Sea are characterized by mountain blocks bounded by reverse faults 30 to 100 kilometers long and 20 to 40 kilometers wide which are arranged parallel to the major trend of the island arc. Most of the block-boundary faults began to grow in the beginning of the Pleistocene and are inferred to have had continued movement up to the present. Historical and instrumental records of seismicity strongly suggest that damaging earthquakes are associated with movement of the fault blocks. Surface manifestations of the recent movement of the block-boundary faults in this region are, however, generally not clear, probably because of the thick and soft sedimentary cover.
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