新国家标准震级标度与传统震级标度对比研究

Comparison of the new national standard magnitude scales with the traditional magnitude scales

使用四川省地震台网2013年4月以来的宽频带数字地震资料,对新国家标准震级标度与传统震级标度中的4类震级进行了对比分析。结果表明:新ML与传统ML、MS(BB)与MS7之间的差别最小,相关性最高;所有事件的新mb均大于或等于传统mb;大部分事件的新ML大于传统ML;m B(BB)大于m B的事件多于m B(BB)小于m B的事件;MS(BB)小于MS7的事件数量与MS(BB)大于MS7的事件接近;新ML较传统ML更符合区域地质实际状况,新mb较传统mb更便于测量,MS(BB)较MS7、m B(BB)较m B更适应当前的宽频带数字地震资料,其测定结果更稳定。新国家标准震级标度充分考虑了我国震级测定的历史连续性,很好地继承和衔接了传统震级标度,在可操作性和资料适用性方面有极大提高。

The new national standard magnitude scales and traditional magnitude scales are analyzed by using broadband seismic data from Sichuan seismic network science April of 2013. The results suggest that the differences between the new and the traditional ML,and the MS（BB） and MS7 are small,hence,they are the high correlated. The new mb is greater than or equal to the traditional mb for all events, while the new ML is greater than the traditional ML for most events. In addition,the MS（BB） is less than the MS7 for half of the events. Moreover,the new ML is more suitable in the actual regional geological condition compared with the traditional one,the new mb is easier to measure,the MS（BB） and m B（BB） are more stable and adapt to the current broadband digital seismic data. Therefore,the new national standard magnitude scale not only has a good continuity of magnitude determination,but also has been greatly improved in terms of operability and applicability.