摘要
应用地震动衰减关系计算了1966年邢台地震以来中国大陆及近海发生的21次MS≥7地震序列的主震和强余震产生的有效峰值加速度,并对计算结果进行了比较分析,发现76.2%地震序列的强余震产生的有效峰值加速度超过主震,其中50%多的强余震产生的有效峰值加速度在大范围内大幅度地超过主震.本研究表明在强余震震中区附近,强余震往往会造成比主震更严重的破坏,因此在地震危险性分析中要充分考虑强余震的影响场,才能为抗震设防提供科学、安全、可靠的依据.
Using the ground motion attenuation relation, we calculated and compared the effective peak acceleration（EPA） generated by main shocks and their strong aftershocks of 21 earthquake sequences with Ms≥7 occurred in Chinese mainland and offing of China during 1966-2002. The result shows that EPA of strong aftershocks usually exceed that of main shock for 76. 2% earthquake sequences and EPA of more than 50% strong aftershocks are greatly larger than that of main shocks in large area, which suggests that it is necessary to take damage produced by strong aftershock into account in the probabilistic seismic hazard analysis and the seismic design.
出处
《地震学报》
CSCD
北大核心
2007年第3期295-301,337,共7页
Acta Seismologica Sinica
基金
科技部重点国际合作项目(2004DFA06000)
地震科学联合基金项目(604025)资助.
关键词
强余震
有效峰值加速度
抗震设防
strong aftershock
effective peak acceleration
seismic design
