河北矾山盆地北缘断层八营段的古地震重复模型

Model for Paleoearthquake Recurrence Along Baying Segment of the North Margin Fault of Fanshan Basin in Hebei Province

通过实测断错地貌面，开挖大探槽以及系统的地层年代采样，推断和揭露出矾山盆地北缘断层八营段９万年来总位移量为３４ｍ。约７５万年来共发生过９次古位移事件。其中大探槽揭露的４次事件分别发生在距今：Ａ，２．８万年；Ｂ，１４万年；Ｃ，０７５万年和Ｄ，６５６年（？）左右。该段落古地震的重复模型分为两个阶段：９～１４万年间符合“时间可推测模型”；１４万年以来则为“位移衰减模型”。

Based on the measurement of faulted geomorphic surfaces, large trench logging and systematic chronostratigraphic sampling, we suggest that the total slip amount along the Baying segment of the north margin fault of Fanshan Basin since 90ka B.P. is 34 m. Nine paleoseismic events occurred in the last 75ka. Among them, the four events A, B,C,and D revealed by the large trench were dated at 28ka, 14ka, 7.5ka, and 656B.P., respectively. The model for paleoearthquake recurrence along the segment may have two stages; in the stage from 90ka to 14ka B.P., the“time predictable model” is suitable, while in the stage from 14ka B.P. to now, the “displacement attenuation model” applies.