利用余震法快速判定宏观震中的研究  

Rapid Determination of Macro Epicenter Based on Aftershocks

作　　者：王伟锞[1] 李志强[1] 李晓丽[1] 

机构地区：[1]中国地震局地质研究所,北京100029

出　　处：《震灾防御技术》2011年第1期36-48,共13页Technology for Earthquake Disaster Prevention

基　　金：地震应急青年基金(CEA_EDEM_201017);中央级公益性科研院所基本科研基金(DF-IGCEA-0608-2-9);国家973科技支撑项目(2008BAC44B01)共同资助

摘　　要：当前在震后快速响应阶段的盲场快速评估过程中,震中位置普遍采用速报震中,而速报震中与实际宏观震中之间存在客观的不一致性,会给震灾评估结果带来较大的误差。而在震后短时间内可用信息量极少的情况下,判断宏观震中的位置存在较大的困难,本文通过引入余震法,为震后快速判定宏观震中提出了新的思路。通过对1970年以来近40组破坏性地震的研究,利用余震法可在震后6h根据地震破裂性质推断宏观震中,其准确度、时效性都能为震后快速评估提供较为可靠的依据。Currently, the micro epicenter is usually regarded as the macro epicenter approximately when the rapid off-site estimation is calculated in the stage of rapid response after the earthquake. However, the inconsistency between micro epicenter and macro epicenter probably leads to a big error of the result. In view of the great difficulty in determining macro epicenter under the condition of little information available shortly after the earthquake, this paper introduces the method of aftershock analysis, a new approach for rapid determination of macro epicenter. Through analysis on 40 groups of destructive earthquakes since 1970, we find that macro epicenter can be inferred with our aftershock-analysis method,. By this method, it is possible to estimate the macro epicenter within after main shock.

关 键 词：盲场快速评估 余震法 微观震中 宏观震中 

分 类 号：P315.6[天文地球—地震学]