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

摘要

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 90 ka B.P. is 34 m. Nine paleoseismic events occurred in the last 75 ka. Among them, the four events A, B, C, and D revealed by the large trench were dated at 28 ka, 14 ka, 7.5 ka, and 656 B.P., respectively. The model for paleoearthquake recurrence along the segment may have two stages; in the stage from 90 ka to 14 ka B.P., the "time-predictable model" is suitable, while in the stage from 14 ka B.P. to now, the "displacement-attenuation model" applies.