We have systematically sorted out the seismic events of each secondary fault and its surroundings in the Zhangjiakou-Bohai tectonic belt and jointly carried out their seismicity characteristic study using the accelerating moment release (AMR) model, which fully reflects the release of energy before earthquakes; the Ogata-Katsura 1993 model, which can reflect the accumulated stress level; the moment ratio model, which reflects the frequency change; the region-time-length algorithm, which reflects the calm of regional seismicity. The results showed that the completeness magnitude of the earthquake sequence in the secondary fault area of the Zhangjiakou-Bohai tectonic belt does not change significantly with time but exhibits a small fluctuation change, and the minimum completeness magnitude measured comprehensively is 1.5. The calculated results of various seismicity models exhibited some differences among secondary faults. The AMR and seismic anomaly level of the Nankou-Sunhe fault and Liangxiang-Shunyi hidden fault are relatively high, the stress level of the Tangshan fault and Luanxian-Laoting fault is relatively high, and the seismic activity frequency of the Huaizhuo Basin northwest margin fault and Penglai-Weihai fault changes rapidly. Weighted by the calculation results of various seismicity models, the overall hazard level of each secondary fault in the Zhangjiakou-Bohai tectonic belt is low, and the Nankou-Sunhe fault, Penglai-Weihai fault, and Liangxiang-Shunyi hidden fault are the areas where strong earthquakes need to be focused on in the future.

系统梳理了张渤构造带各次生断裂及其周边地区的地震事件，并利用加速矩释放（AMR）模型联合开展了地震活动特征研究，充分反映了震前能量的释放情况；Ogata-Katsura 1993模型，可以反映累积应力水平；力矩比模型，反映频率变化；区域-时间-长度算法，体现了区域地震活动的平静。结果表明，张渤构造带次生断裂区地震序列完整性震级随时间变化不明显，呈小幅波动变化，综合测得的最小完整性震级为1.5级。各种地震活动模型的计算结果在次生断层之间存在一定差异。南口—孙河断裂和良乡—顺义隐伏断裂的AMR和地震异常水平较高，唐山断裂和滦县—乐亭断裂的应力水平较高，怀涿盆地西北缘断裂地震活动频率蓬莱—威海断裂带变化迅速。综合各地震活动模型计算结果，张渤构造带各次生断裂总体危险程度较低，其中南口—孙河断裂、蓬莱—威海断裂、良乡—顺义隐伏断裂为危险性较大的区域。未来需要重点关注强震。南口—孙河断裂和良乡—顺义隐伏断裂的AMR和地震异常水平较高，唐山断裂和滦县—乐亭断裂的应力水平较高，怀涿盆地西北缘断裂地震活动频率蓬莱—威海断裂带变化迅速。综合各地震活动模型计算结果，张渤构造带各次生断裂总体危险程度较低，其中南口—孙河断裂、蓬莱—威海断裂、良乡—顺义隐伏断裂为危险性较大的区域。未来需要重点关注强震。南口—孙河断裂和良乡—顺义隐伏断裂的AMR和地震异常水平较高，唐山断裂和滦县—乐亭断裂的应力水平较高，怀涿盆地西北缘断裂地震活动频率蓬莱—威海断裂带变化迅速。综合各地震活动模型计算结果，张渤构造带各次生断裂总体危险程度较低，其中南口—孙河断裂、蓬莱—威海断裂、良乡—顺义隐伏断裂为危险性较大的区域。未来需要重点关注强震。怀涿盆地西北缘断裂和蓬莱—威海断裂地震活动频率变化较快。综合各地震活动模型计算结果，张渤构造带各次生断裂总体危险程度较低，其中南口—孙河断裂、蓬莱—威海断裂、良乡—顺义隐伏断裂为危险性较大的区域。未来需要重点关注强震。怀涿盆地西北缘断裂和蓬莱—威海断裂地震活动频率变化较快。综合各地震活动模型计算结果，张渤构造带各次生断裂总体危险程度较低，其中南口—孙河断裂、蓬莱—威海断裂、良乡—顺义隐伏断裂为危险性较大的区域。未来需要重点关注强震。