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  高孟潭,陈学良,俞言祥,雷建成.“5·12”汶川8.0级地震汉源烈度异常机理的初步探讨[J].震灾防御技术,2008,3(3):216-223, DOI:10.11899/zzfy20080303.

“5·12”汶川8.0级地震汉源烈度异常机理的初步探讨
摘要:    本文通过总结分析汉源烈度异常主要特征,初步分析了导致烈度异常的可能原因。初步研究结果表明,"5·12"汶川8.0级地震震源过程及其能量释放空间分布和场地条件是导致汉源烈度异常的主要因素,同时莫霍界面反射波S11、断层破裂带的阻震及激震效应等,也可能是汉源烈度的影响因素。探索汉源烈度异常对总结特大地震烈度分布、震害特征和成灾机理具有重要意义。为此作者提出,应在震害特征总结提炼的基础上,考虑震源机制、地壳介质、场地非线性等因素,对汉源烈度异常区进行全面的数值模拟,进一步确定汉源地震烈度异常的机理。
作者单位
高孟潭 中国地震局地球物理研究所,北京100081 
陈学良 中国地震局地球物理研究所,北京100081 
俞言祥 中国地震局地球物理研究所,北京100081 
雷建成 四川省地震局,成都610041 
关  键  词:汶川地震  汉源县  烈度异常  震源  场地条件
DOI:10.11899/zzfy20080303
基金项目:科技部科技支撑项目2006BAC13B01“强震危险区划关键技术研究”; 中国博士后科学基金项目20070420047联合资助
收稿日期:2008-08-17
作者简介:高孟潭,男,生于1957年。研究员,博士生导师。主要研究领域:工程地质和地震区划。E-mail:gaomt@vip.sina.com
通讯作者:
Preliminary Discussion on Intensity Anomalous Mechanism of Hanyuan Town in 5.12 Wenchuan Earthquake
Abstract:      In this paper, primary characteristics of intensity anomaly of Hanyuan town are summarized, and possible reasons of its intensity anomaly are analyzed. The result indicates that both hypocenter mechanism of 5.12 Wenchuan MS8.0 earthquake and its spatial energy distribution and site condition are the essential reasons of intensity anomaly. Futhermore, the reflected wave S11 from Moho interface, stimulation effect of the fault fracture zone are also likely to contribute the intensity anomaly. The intensity anomaly is significant for the study of large earthquake intensity distribution, earthquake damage characteristics and the disaster mechanism. Finally, we propose a method on general numerical simulation for Hanyuan intensity anomaly, which is based on the summary and the refinement of damage characteristics, and with the consideration of hypocenter mechanism, crust media and nonlinear site condition.
Keywords:  Wenchuan earthquake  Hanyuan town  Intensity anomaly  Hypocenter mechanism  Site condition
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