The Ayashi-Okubushi Monocline, accompanied by an active thrust zone including the Ayashi Fault, western Sendai, northeast Japan

Abstract

Observation of outcrops of the Ayashi-Okubushi Monocline, western Sendai, indicates that the monocline is closely associated with thrusts. These thrusts also cut the Quaternary terrace deposits. Among these thrusts, the largest thrust is the north-northeast trending Ayashi Fault, known as an active fault. The thrust geometry indicates N-S and NW-SE compressions in late Quaternary time. The Ayashi-Okubushi Monocline crosscuts the older Kagitori-Ayashi Monocline.