利用直达P波测定地方震震源深度的探讨
|
摘要
震源深度是地震时空参数中的基本参数,是目前最难测准的参数之一。可以使用直达P波测定震源深度。要确保测定结果的精度,必须加密台网观测点,使台间距的大小与震源深度相当。利用四川省西昌和冕宁大桥水库两个遥测地震台网的直达P波资料,测定发生在其监控区域内137个地震的震源深度。结果发现,该区域地震的平均深度和深度下限存在随震级增大而增加的现象。其中有部分地震的震源深度,利用本研究方法测定的结果与使用遥测地震台网计算机定位程序输出的结果相差较大。作者认为,这部分地震使用计算机定位程序得出的震源深度有较大的误差。
Focal depth of earthquakes is one basic parameter of the special-temporal parameters that is hard to measure precisely.One measurement method is using the direct P-wave arrival. The accuracy of measurement,however,is depended on the epicenter of the nearest station, which should be equal to or near the focal depth.In this paper,using the direct P-wave arrival data from two remote sensing seismic networks located in Xichang and in Daqiao reservoir, Mianning,Sichuan Province,the focal depths of 137 earthquakes in the monitoring area are determined.It was found that the average and low limit of focal depths of regional earthquakes increase with the magnitudes of the earthquakes.Among all the focal depths, some depths determined by the method presented here are much different with that obtained from the automatic computer location software.We consider that the depths of this part of earthquakes given by computer location program are with large error.
Focal depth of earthquakes is one basic parameter of the special-temporal parameters that is hard to measure precisely.One measurement method is using the direct P-wave arrival. The accuracy of measurement,however,is depended on the epicenter of the nearest station, which should be equal to or near the focal depth.In this paper,using the direct P-wave arrival data from two remote sensing seismic networks located in Xichang and in Daqiao reservoir, Mianning,Sichuan Province,the focal depths of 137 earthquakes in the monitoring area are determined.It was found that the average and low limit of focal depths of regional earthquakes increase with the magnitudes of the earthquakes.Among all the focal depths, some depths determined by the method presented here are much different with that obtained from the automatic computer location software.We consider that the depths of this part of earthquakes given by computer location program are with large error.
引文
房明山,杜安陆,董孝平,等.用sPn震相测定近震震源深度[J].地震地磁观测与研究,1995,16(5) :13-18．
高立新,刘芳,赵蒙生,等.用sPn震相计算震源深度的初步分析与应用[J].西北地震学报2007,29(3) :213-217．
高原,周蕙兰,郑斯华,等.测定震源深度的意义的初步讨论[J].中国地震,1997,13(4) :321 329．
韩京,周仕勇,黄建英,等.新疆地震目录中的中源地震定位问题研究[J].内陆地震,2004,18(2) :113-121．
洪星,杨贵,林仙坎,等.sPn震相的多台同时测定法[J].地震地磁观测与研究,2006,27(3) :77-80．
李志伟,胥颐,郝天珧,等.利用DE算法反演地壳速度模型和地震定位[J].地球物理学进展,2006,21(2) :370-378．
马宏生,张国民,周龙泉,等.川滇地区中小震重新定位与速度结构的联合反演研究[J].地震,2008,28(2) :29-38．
吴新元.对牛顿迭代法的一个重要修改[J].应用数学和力学,1999,20(8) :863-866．
张少泉.近震分析[M].北京:地震出版社,1977．
朱艾斓,徐锡伟,周永胜,等.川西地区小震重新定位及其活动构造意义[J].地球物理学报,2005,48(3) :629-636．
朱元清.提高地震定位精度新方法的研究[J].地震地磁观测与研究,1997,18(5) :59-67．
高立新,刘芳,赵蒙生,等.用sPn震相计算震源深度的初步分析与应用[J].西北地震学报2007,29(3) :213-217．
高原,周蕙兰,郑斯华,等.测定震源深度的意义的初步讨论[J].中国地震,1997,13(4) :321 329．
韩京,周仕勇,黄建英,等.新疆地震目录中的中源地震定位问题研究[J].内陆地震,2004,18(2) :113-121．
洪星,杨贵,林仙坎,等.sPn震相的多台同时测定法[J].地震地磁观测与研究,2006,27(3) :77-80．
李志伟,胥颐,郝天珧,等.利用DE算法反演地壳速度模型和地震定位[J].地球物理学进展,2006,21(2) :370-378．
马宏生,张国民,周龙泉,等.川滇地区中小震重新定位与速度结构的联合反演研究[J].地震,2008,28(2) :29-38．
吴新元.对牛顿迭代法的一个重要修改[J].应用数学和力学,1999,20(8) :863-866．
张少泉.近震分析[M].北京:地震出版社,1977．
朱艾斓,徐锡伟,周永胜,等.川西地区小震重新定位及其活动构造意义[J].地球物理学报,2005,48(3) :629-636．
朱元清.提高地震定位精度新方法的研究[J].地震地磁观测与研究,1997,18(5) :59-67．
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心