广东数字遥测地震台网台站震级偏差的研究

A Study on Magnitude Deviation at Digital Telemetric Seismic Network of Guangdong Province

选取广东数字遥测地震台网自2000年1月正式运行至2007年6月记录的广东省境内及邻区368次较大的地震事件,利用msdp-dm分析软件对其进行分析处理,计算了各单台震级与台网平均震级的偏差、平均偏差和标准离差,分析了仪器、量规函数、台基诸因素产生震级偏差的主要原因。结果显示,不同类型地震仪器对震级偏差影响很小,量规函数偏差明显,在震中距0～60km内,量规函数偏差为负值;在60～380km范围内偏差不大,认为在日常大震速报中,可直接用此震中距的台站量取震级;而大于380km以后台网量规函数偏差为正。给出了台基校正值。通过对样本数归类统计、计算、分析,给出了量规函数校正值和台基校正值。

Using MSDP-dm analysis software,368 earthquake events occurred in Guangdong province and its neighbor areas between January,2000 and June,2007 are analyzed.The deviation,mean deviation and standard deviation between each single station's magnitude and the network's mean magnitude are calculated.The factors to cause the magnitude deviation such as instrument,gauge function and station base are also analyzed.The result shows that the influence caused by different types of instruments is not obvious to magnitude deviation and remarkable to gauge function deviation.The gauge function deviation is negative when the epicentral distance is from 0 to 60 km,very small from 60～380 km and positive more than 380 km.