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山西2015地壳速度模型研究
殷伟伟,陈存田,宋秀青,李自红,梁向军,朱元清
作者单位E-mail
殷伟伟 山西省地震局, 太原市旧晋祠路二段69号 030021  
陈存田 山西省地震局, 太原市旧晋祠路二段69号 030021  
宋秀青 上海市地震局, 上海 200062  
李自红 山西省地震局, 太原市旧晋祠路二段69号 030021  
梁向军 山西省地震局, 太原市旧晋祠路二段69号 030021  
朱元清 上海市地震局, 上海 200062 yqzhu@stn.sh.cn 
摘要:
针对山西测震台网缺少适合本地区地壳速度模型的现状,在前人工作成果的基础上,基于山西测震台网2009~2014年间产出的大量震相数据,采用"线性拟合"和"折合走时"法分别确定了模型参数中速度和深度的波动范围;利用Hyposat定位程序,使用46489组模型,分别批量定位76个地震事件,并选取残差最小的一组参数作为山西2015地壳速度模型;最后运用批量定位比较残差、PTD测定深度和人工爆破等3种方法对山西2015地壳速度模型进行了验证。结果表明:在山西地区进行地震定位时,山西2015地壳速度模型相较于现有的修正J-B模型残差更小,精度更高,具有更好的适用性。
关键词:  地壳速度模型  残差  折合走时  PTD
DOI:
分类号:P315
基金项目:中国地震局监测预报司专项任务(15080404)、中国地震局测震台网青年骨干培养专项(20160505)以及山西省地震局项目(SBK-1727、SBK-1825、SBK-1832)共同资助
The 2015 Crustal Velocity Model for the Shanxi Region
Yin Weiwei,Chen Cuntian,Song Xiuqing,Li Zihong,Liang Xiangjun,Zhu Yuanqing
Abstract:
The lack of the suitable velocity model for the Shanxi seismic network led the present study on one dimensional crustal velocity model in Shanxi. Based on the collection of the previous work,which includes a large number of seismic phase data produced by the Shanxi seismic network during the period of 2009-2014. The fluctuation range of velocity and depth in the model parameters were determined by the method of linear fitting and "reduced travel time". Then 76 seismic events were batch located by using Hyposat location program and 46,489 sets of models. A set of parameters with minimal residual error was picked up as a new model. Finally,the Shanxi 2015 velocity model was verified through 3 different ways:the comparison of the residual error of the batch location,PTD measured depth and the artificial blasting. The results showed that the 2015 Shanxi crustal velocity model has less residual error,higher accuracy and better applicability thhan thhe modified J-B model which is being used now for the earthquake location in Shanxi.
Key words:  Crustal velocity model  Residual error  Reduced travel time  PTD