【摘要】 选取山西数字地震台网自2001年3月至2007年12月所记录到的100次ML≥3.0以上的地震事件,计算单台震级与平均震级的偏差。分析发现,单台震级与台网平均震级的偏差除镇川、岢岚、山自皂3个台较大外,其余台站均较小;目前所用量规函数在震中距小于40km和大于240km时偏差较大,认为,在大震速报中直接采用震中距在40km~240km的台站参与计算震级是一种更简便可行的办法。更多还原

【Abstract】 For selected 100 ML≥3.0 earthquake events recorded from March 2001(the time that Shanxi Digital Seismic Network began formally running) to December 2007,the deviations between single station magnitudes and average ones are calculated.It shows that the magnitude deviations of Zhenchuan,Kelan and Shanzizao stations are relatively larger,compared with average one of the Network,so if enough other stations are available for magnitude determination in a rapid earthquake reporting,these three stations should be excluded.The deviation of calibration function is larger when epicenter is shorter than 40 km or farther than 240 km,so that in large earthquake rapid reporting,it is thought to use the data of stations of epicenter distances within 40 km-240 km to calculate magnitude directly is a simple,convenient and feasible way.更多还原