张家口一渤海构造带地震活动特征的分段研究

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中图分类号：P315 文献标志码：A 文章编号：1000-0844（2025）05—1232—12DOI：10.20000/j.1000-0844.20230919001

Abstract： To systematically investigate the segmentation characteristics of seismic activity along the Zhangjiakou—Bohai tectonic belt，this study combines qualitative and quantitative approaches to evaluate the seismic detection capability of the belt. A suite of models is employed to analyze seismic segmentation，including the accelerating moment release （AMR） model （which reflects moment acceleration），the OKl993 model （used to access stress accumulation via the b -value）， the moment ratio model （which analyzes frequency variations），and the region-time-length algorithm（which evaluates regional seismic activity）. The analysis reveals that the completeness magnitude of seismic sequences along the belt remains largely stable over time，with only minor fluctuations；therefore，a minimum completeness magnitude of 2.O is appropriate. Model results show distinct segment differences： for instance， the Zhangjiakou and Beijing segments display higher AMR levels and greater stress accumulation，while the Zhangjiakou and Tangshan segments exhibit elevated anomalous seismic activity. A weighted analysis of all seismicity models indicates an overall low seismic risk across the belt，with the Zhangjiakou segment identified as the top priority for future strong earthquake monitoring.

Keywords： Zhangjiakou—Bohai tectonic belt； segmentation; model parameters； seismicity char-acteristics

0 引言

张家口一渤海构造带（以下简称“张一渤构造带"是中国东部一条横跨不同活动块体的地震构造带，其深、浅部结构构造复杂多样且具有较为明显的分段特征。（剩余17736字）