设计地震反应谱的双参数标定方法及其应用

近年的工程地震工作,如地震小区划、重大工程场地的危险性分析等,一般都要做设计谱标定。既反映局部场地条件,又反映地震环境的双参数标定设计谱的方法,已为工程界接受。作为该方法的应用,本文采用澜沧——耿马地震的强震资料,重新确定了设计反应谱的形状参数,给出了反映云南地区地震特性的设计谱,可供中、小型工业与民用建筑抗震设计时参考使用。     

Long-term slow slip events are not necessarily caused by high pore fluid pressure at the plate interface: an implication from two-dimensional model calculations

A recent tomographic study proposed that high-pore pressure in the deeper portion of the locked zone of a subduction thrust resulting from metamorphic dehydration reactions may cause long-term slow slip events. The study used the concept of 'critical fault stiffness', which derives from laboratory-derived rate- and state-dependent friction laws. To test the proposition, we execute 2-D model calculations using laboratory-derived rate- and state-dependent friction laws. Our numerical result is against the proposition, but it can also be explained by the concept of the critical fault stiffness. We agree that metamorphic dehydration reactions definitely produce a bulk property of high fluid saturation, but we caution that they do not necessarily lead to high-pore pressure in the fault zone.