【摘要】 为估计近场地震动场,研究了设定在邻近兰州市马衔山北缘断裂西段一个6.5级地震的震源模型。在这个混合震源模型中有2类震源参数。全局参数主要根据区域地壳结构、区域地震活动性和半经验标定公式确定。局部参数分两组,一组是描述凹凸体的,主要根据详细的活断层探查资料和标定公式确定;另一组是k平方模型参数,依标定公式估算。文中展示了生成震源模型的6个例子。最后,依选定的计算点随机合成的地震动反应谱选定了代表平均特征的震源模型。更多还原

【Abstract】 Source model of an earthquake with magnitude 6.5 is investigated for estimation of near ground motion field.The earthquake is on the western segment of Maxianshan Beiyuan fault,which is close to Lanzhou city.There are 2 kinds of source parameters in the hybrid source model.The global parameters are mainly determined from the regional structure of the crust,the regional seismicity and some semi-experiential calibration laws.The local parameters consist of two groups.One is on asperity,determined mainly from detail investigation and exploration of the fault and also calibration laws.The other is on K square distribution,estimated by a set of calibration laws.Six of total 30 source models are presented,and the mean model is selected finally from the response spectra of motion randomly synthesized at some selected ground points.更多还原