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It is indicated by historical records and the exploratory trench on the Weihe fault that the Yaodian-Zhangjiawan segment of the Weihe fault zone has experienced a historical earthquake and 3 paleoearthquake events in the past 9110a.The historical earthquake,namely,event IV,occurred between 1487 and 1568 AD.The date of paleoseismic event I is(9110±90)a,and the ages of events II and III are unknown.The coseismic vertical displacement of events I,II and III is 0.5m,0.5m and 0.2m,respectively.The exploratory trench also indicates that the Yaodian-Zhangjiawan segment of the Weihe fault was active in the Holocene.
It is indicated by historical records and the exploratory trench on the Weihe fault that the Yaodian-Zhangjiawan segment of the Weihe fault zone has experienced a historical earthquake and 3 paleoearthquake events in the past 9110a. The historical earthquake, namely, event IV, occurred between 1487 and 1568 AD. The date of paleoseismic event I is (9110 ± 90) a, and the ages of events II and III are unknown. Coseismic vertical displacement of events I, II and III is 0.5m, 0.5m and 0.2m , respectively. The exploratory trench also indicates that the Yaodian-Zhangjiawan segment of the Weihe fault was active in the Holocene.