甘肃积石山M_(S)6.2地震的多普勒效应  

Doppler Effect of Jishishan M_(S)6.2 Earthquake,Gansu

作　　者：况春利 韩光洁 刘奕君 戴丹青 KUANG Chunli;HAN Guangjie;LIU Yijun;DAI Danqing(Institute of Seismology,CEA,40 Hongshance Road,Wuhan 430071,China;Hubei Earthquake Agency,48 Hongshance Road,Wuhan 430071,China;China Earthquake Networks Center,5 Nanheng Street,Sanlihe,Beijing 100045,China)

机构地区：[1]中国地震局地震研究所,武汉市430071 [2]湖北省地震局,武汉市430071 [3]中国地震台网中心,北京市100045

出　　处：《大地测量与地球动力学》2024年第12期1271-1274,共4页Journal of Geodesy and Geodynamics

基　　金：中国地震局地震科技星火计划(XH23050YB);湖北省地震局基础科研基金(306337-37)。

摘　　要：收集甘肃积石山M_(S)6.2地震震中距2°~15°范围内测震数据和211组近场强震记录,分别测定面波震级和不同周期的水平向地震动反应谱值。结果表明,91个台站测得的宽频带平均面波震级M_(S(BB))为6.2,震级空间分布具有南东小、北西大的特征;水平向地震动反应谱值主要呈椭圆状展布,最大反应谱值主要位于震中北西方向两侧。地震震级分布和加速度反应谱的空间分布特征具有明显的断层地震多普勒效应,结合地震构造背景、震源机制解、余震序列精定位和破裂过程反演等推断,发震构造可能位于拉脊山断裂北缘。In this paper,we use seismic stations within 2°to 15°epicentral distance to measure the surface-wave magnitude of Jishishan M_(S)6.2 earthquake,Gansu.Using 211 near-field strong motion acceleration records,we calculate the acceleration response spectra at different periods.The results show that the surface-wave magnitude M_(S(BB))averaged 6.2 in the 91 stations,and the spatial distribution of the magnitudes is smaller in the southeast and larger in the northwest.The research results show that the spatial distribution of horizontal ground motion intensity is mainly elliptical spread,and the maximum response spectrum value is mainly located on the northwest sides of the epicenter.The magnitude distribution and the near-field acceleration response spectra of this earthquake are spatial distribution characteristics,with an obvious fault seismic Doppler effect.Meanwhile,combined with the seismic fault data,focal mechanism,aftershock relocation,rupture process and so on,the earthquake may belong to the northern edge of Lajishan fault.

关 键 词：积石山M_(S)6.2地震 多普勒效应 面波震级 近场地震动 

分 类 号：P315[天文地球—地震学]