江苏数字地震台网台站震级偏差的分析
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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 digital seismic network.The result shows: ①The magnitude measured by the substations is smaller when the epicentral distance is smaller (<100 km), when 100 km<Δ<250 km, magnitude deviation is basically equal to zero;②The 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;③Soft sediments have great impact on magnitude, with positive deviation;The impact of limestone is smallest.
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 digital seismic network.The result shows: ①The magnitude measured by the substations is smaller when the epicentral distance is smaller (<100 km), when 100 km<Δ<250 km, magnitude deviation is basically equal to zero;②The 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;③Soft sediments have great impact on magnitude, with positive deviation;The impact of limestone is smallest.
引文
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张文佑,李阴槐,等.中国及邻区海陆大地构造[M].北京:科学出版社,1986:267-278．
中国地震局.地震及前兆数字观测技术规范[M].北京:地震出版社,2001．
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Howell B F.Precision of different varieties of magnitude[J].BSSA,1972,62(3) :789-792．
Richter C F.An instrumental earthquake magnitude scale[J].BSSA,1935,25(1) :1-32．
陈运泰,吴忠良,王培德,等.数字地震学[M].北京:地震出版社,2000:1-30．
陈运泰,吴忠良.地震的震级[J].地震地磁观测与研究,2004,25(6) :1-12．
傅淑芳,刘宝诚.地震学教程[M].北京:地震出版社,1980:202-236．
傅再扬,李祖宁,丁学仁,等.福建和台湾地震台网测定地震震级差异研究[J].地震研究,2008,81(1) :32-36．
冈本舜三.地震工程学导论[M].北京:学术期刊出版社,1989,16:81．
黄耘,李清河,孙业君,等.江苏及邻区地震重新定位和构造特征分析[J].地球物理学报,2008,51(1) :175-185．
江苏省地震局.江苏省数字地震台网工程技术报告[R].2007．
刘瑞丰,陈运泰,Bormann P,等.中国地震台网与美国地震台网测定震级的对比(Ⅰ)--体波震级[J].地震学报,2005,27(6) :583-587．
孟晓春.地震观测与分析技术[M].北京:地震出版社,1998．
孟智民,李少蓉,张春芳.陕西数字地震台网子台测定震级的研究[J].地震研究,2005,28(2) :150-156．
王俊,徐戈,孙业君.江苏省区域地表背景噪声特性分析[J].地震研究,2009,32(2) :155-161．
徐家炜.郯庐断裂带的平移运动及其地质意义[A]//国际交流地质学术论文集,第1册构造地质,地质力学[C].北京:地质出版社,1980．
薛峰,赵永.DK1地震仪的面波起算函数研究[J].地震学报,1997,19(3) :235-240．
张文佑,李阴槐,等.中国及邻区海陆大地构造[M].北京:科学出版社,1986:267-278．
中国地震局.地震及前兆数字观测技术规范[M].北京:地震出版社,2001．
Bormann P.New Manual of Seismological Obersvatory Practice[M].GeoForschungsZen-trum Porsdam,2002:2-57．
Howell B F.Precision of different varieties of magnitude[J].BSSA,1972,62(3) :789-792．
Richter C F.An instrumental earthquake magnitude scale[J].BSSA,1935,25(1) :1-32．
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