三峡地区震级偏差初步对比分析

PRIMARY COMPARATIVE ANALYSIS OF MAGNITUDE DEVIATION IN THREE GORGES AREA

选用三峡遥测地震台网和湖北省数字测震台网共同记录到的发生在三峡地区的231次地震事件(2007年6月—2009年12月,MSL≥2.0),对两个台网所确定的地震震级进行对比研究,结果表明用三峡遥测地震台网资料得到的地震震级偏大:2.0≤MSL<2.5的地震,MSL比MLH大0.16级;2.5≤MSL<3.2地震,MSL比MLH大0.11级;MSL≥3.2地震,MSL与MHL基本相等。

A comparative analysis of the 231 earthquakes （ ML^S ≥ 2.0） in the Three Gorges area recorded by both the telemetry seismic network in Three Gorges and the digital seismological network of Hubei province from June 2007 to December 2009 was carried out. The results show that the average magnitude from the telemetry seismic network in the Three Gorges is larger than that from the digital seismological network of Hubei province, as 2.0 ≤ ML^S 〈 2.5, Ms is larger than ML^H by 0.16 magnitude ; as 2.5 ≤Ms 〈 3.2, Ms is larger than ML^H by 0.11 magnitude ; as Ms ≥3.2, Ms almost equals to ML^H.