马衔山北缘断裂西段地震动场估计的震源模型  

A source model for strong ground motion field estimation on the western zone of Maxianshan Beiyuan fault

作　　者：刘海明[1] 陶夏新[1,2,3] 孙晓丹 刘陶钧[2] 

机构地区：[1]重庆交通科研设计院,桥梁工程结构动力学国家重点实验室,重庆400067 [2]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150001 [3]中国地震局工程力学研究所,黑龙江哈尔滨150080

出　　处：《世界地震工程》2010年第3期60-66,共7页World Earthquake Engineering

基　　金：桥梁结构抗震技术交通行业重点实验室开放基金项目(200802);国家自然科学基金项目(50778058,90715038);国家重点科技支撑项目(2006BAC13B02);交通部人才项目

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。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.

关 键 词：近场地震动 混合震源模型 全局参数 局部参数 

分 类 号：P315.97[天文地球—地震学] P315.915[天文地球—固体地球物理学]