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内蒙古分区地壳一维速度模型的检验
贾昕晔, 王鑫, 王树波, 翟浩, 杨智升, 刘永梅, 王旭东, 张小艳, 徐岩, 苏相达, 刘芳
内蒙古自治区地震局, 呼和浩特 010051
摘要:
基于“2015模型”和分区模型对比的方法,开展折合走时、典型地震、爆破和塌陷以及PTD震源深度测定4个方面的模型适用性检验。检验结果显示,采用分区模型时,随机抽取事件均位于折合走时理论线中间;典型事件、爆破和塌陷使用分区模型得到的定位残差较“2015模型”明显减小,且使用“3个区域与编目”获得的震中差较“2015—编目”有明显降低。使用分区模型进行PTD震源深度测定,更符合内蒙古分区地壳厚度分布特征。分区模型与全球地壳模型crust 1.0、crust 2.0和使用接收函数得到的Moho面厚度分布结果基本一致。综合认为,内蒙古西部、中部、东部一维地壳速度模型更符合内蒙古地区区域地质构造特征。
关键词:  内蒙古  分区速度模型  “2015模型”
DOI:
分类号:P315
基金项目:中国地震局地震科技星火项目(XH18012)、中国地震局监测司地震监测预报经常性项目“区域一维速度模型部署”(16A06ZX017)共同资助
An Inspection of One-Dimensional Velocity Model of the Partitioned Crust in Inner Mongolia
Jia Xinye, Wang Xin, Wang Shubo, Zhai Hao, Yang Zhisheng, Liu Yongmei, Wang Xudong, Zhang Xiaoyan, Xu Yan, Su Xiangda, Liu Fang
Earthquake Agency of Inner Mongolia Autonomous Region, Hohhot 010051, China
Abstract:
Based on the comparison method of 2015 model and zone model,the applicability of model in four aspects including reduced travel time,typical earthquake,blasting and collapse,and PTD source depth measurement was tested. The inspection results show that the random selected events are located in the middle of the reduced travel time theory line with the partition model. The positioning residual of typical events,blasting and collapse obtained by using the zoning model was significantly lower than that of the 2015 model,and the epicentre difference of "three regions-cataloging" was significantly lower than that of "2015-cataloging". The measurement of PTD source depth by using zone model is more consistent with the distribution characteristics of zone crust thickness in Inner Mongolia. The partition model is basically consistent with Crust1.0,Crust2.0 and Moho thickness distribution results obtained by using the receiving function. It is concluded that the one-dimensional crustal velocity model in the west,middle and east of Inner Mongolia is more consistent with the regional geological structure characteristics of Inner Mongolia.
Key words:  Inner Mongolia  Zonal velocity model  The 2015 model