选取陕西地震台网及邻省共享台站记录到的2008年5月至2021年5月104次地震资料，应用新的震级国家标准GB 17740—2017《地震震级的规定》得到新国标震级。研究表明：①新的地方性震级ML比原规范的ML震级系统偏大0.3左右，这主要是二者的量规函数不同造成的；②宽频带面波震级MS （BB）和矩震级MW震级基本一致，无系统偏差，大多数地震震级偏差为-0.1—0.1；③宽频带面波震级MS （BB）比面波震级MS （CENC）整体偏小0.2，二者之间存在系统偏差；④绝大多数地震的面波震级MS （CENC）比MW偏大0.2—0.3，二者之间存在系统偏差。
In order to apply the new Chinese national standard General ruler for earthquake magnitude (GB17740-2017) to the Shaanxi Seismic Network, 104 ML ≥ 4.5 earthquakes from May 2008 to May 2021 recorded by the Shaanxi Seismic Network and shared stations of neighboring provinces were selected to calculate the magnitude. The results show four conclusions as follows. (1) The newly calculated local magnitude ML is about 0.3 larger than that of the original standard ML system, which is mainly caused by the difference in the calibration functions. (2) Broadband surface wave magnitude MS(BB) and moment magnitude MW are basically the same. There is no systematic deviation and the difference between MS(BB) and MW for most earthquakes is between-0.1 and 0.1. (3) Broadband surface wave magnitude MS(BB) is smaller than surface wave magnitude MS(CENC) by 0.2 overall, and there is a systematic deviation between the two results. (4) Surface wave magnitude MS(CENC) is 0.2 to 0.3 larger than MW for most earthquakes, and there is a systematic deviation between the two results.
2021,42(5): 12-20 收稿日期：2021-07-01
DOI：10.3969/j.issn.1003-3246.2021.05.002
基金项目：陕西省地震局启航与创新基金（项目编号：QC201924）
作者简介：徐一斐(1988-),男,工程师,主要从事测震台网运维、数字地震资料分析等研究。E-mail:604182855@qq.com
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