江苏数字地震台网台站震级偏差的分析  

Analysis on the magnitudes determined by the substations of Jiangsu digital seismic network

作　　者：詹小艳[1] 王俊[1] 缪发军[1] 孙业君[1] 郑江蓉[1] 徐戈[1] 

机构地区：[1]江苏省地震局,中国南京210014

出　　处：《地震地磁观测与研究》2010年第2期44-49,共6页Seismological and Geomagnetic Observation and Research

基　　金：中国地震局"三结合"课题资助

摘　　要：利用江苏数字地震台网1999年1月1日-2008年12月31日3个以上子台记录到的约1 500条地震,以台网的平均震级为标准震级,详细分析了江苏数字台网子台的震级偏差原因,结果显示:①在震中距较小时(<100 km),子台测定的震级偏小,在100 km<△<250 km范围内,震级偏差基本为零;②子台测定的震级偏差存在地域分布特征,随方位角显示趋势性变化,地区邻近的子台之间变化特征相近或相似;③江苏数字台网子台台基类型中松散沉积对震级影响最大,偏差均为正值,最大偏差约0.3级,灰岩类型的台基对震级测定影响最小,几乎为零。In this paper, about 1 500 earthquake events recorded by Jiangsu digital seismic network from Jan 1,1999 to Dec 31,2008 were selected; taking the average magnitude as standard magnitude, for analyzing the reason of magnitude deviation of the substations in Jiangsu dig- ital seismic network. The result shows： （1）The magnitude measured by the substations is smaller when the epicentral distance is smaller （〈100 km）, when 100 km〈△〈250 km, magnitude deviation is basically equal to zero; （2）The magnitude deviation measured by the substations has a regional distribution, and has a trend variation with seismic azimuth. The changing characteristics of adjacent substations are similar;（3）Soft sediments have great impact on magnitude, with positive deviation; The impact of limestone is smallest.

关 键 词：江苏数字台网 数字地震台 震级偏差 

分 类 号：P315.32[天文地球—地震学]