【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。更多还原

【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.更多还原