采用Wu等（2004）提出的地震强度测定方法，应用近场速度波形记录，测定地震参数Mew，实现了川滇地区中强地震（MW≥5.7）强度近实时快速测定。Mew是一个与矩震级MW对接的地震参数，与传统的应用振幅测定震级的方法相比，不会存在震级饱和问题，与全球矩心矩张量（GCMT）的矩震级MW具有较好的一致性。该方法解决了应用近场波形资料和矩张量反演方法求取大地震矩震级比较困难的问题，可为区域中强地震速报提供近实时矩震级提供参考，从而提高地震速报的时效性和准确性，同时为强震加速度数据的应用奠定基础。
Using near-field velocity records from regional networks and applying the calculation method of equivalent moment magnitude Mew proposed by Wu et al (2004), the near-real-time rapid determination of the magnitude of moderate-strong earthquakes (MW ≥ 5.7) in Sichuan-Yunnan region has been implemented. Mew is an earthquake parameter that is empirically equivalent to the moment magnitude (MW). Compared with other types of earthquake magnitudes that are calculated by measuring maximum amplitudes of seismic waveforms, Mew has no problem of magnitude saturation and its value is consistent with results from GCMT. This method solves the problem that it is difficult to calculate moment magnitudes of large earthquakes using near-field waveform data and moment tensor inversion methods and provides near real-time equivalent moment magnitude reference for quick reporting regional strong earthquakes, thus not only improving the timeliness and accuracy of earthquake quick report but also laying a good foundation for the application of strong-ground-motion acceleration data.
2020,41(3): 31-36 收稿日期：2020-01-03
DOI：10.3969/j.issn.1003-3246.2020.03.004
基金项目：中国地震局监测、预报、科研三结合课题（项目编号：3JH-20201116）
作者简介：梁姗姗(1989-),女,工程师,主要从事地震定位与震源机制反演研究工作。E-mail:liangshanshan@seis.ac.cn
*通讯作者:梁建宏,男,高级工程师,主要从事地震监测工作。E-mail:liangjh@seis.ac.cn
参考文献：
陈晓佳,薛兵. 近场P波频谱分布及震级确定方法[J]. 地震,2018,38(3):123-133.
郭铁龙,张雪梅,邹立晔. STA/LTA-AIC算法对地震P波震相拾取稳定性影响[J]. 地震地磁观测与研究,2017,38(3):13-17.
刘瑞丰,陈运泰,周公威,等. 地震矩张量反演在地震快速反应中的应用[J]. 地震学报,1999,(2):115-122.
刘瑞丰,陈运泰,王丽艳. 新的震级国家标准的技术要点与主要特点[J]. 地震地磁观测与研究,2018,39(1):1-11.
孙丽,梁建宏. MWP震级测定方法在全球中强地震自动测定中的应用[J]. 地球物理学进展,2016,31(5):2 139-2 144.
吴忠良,陈运泰,倪江川,等. 近震源宽频带记录的地震矩张量反演[J]. 地震学报,1994,16(2):141-152.
邹立晔,黄志斌,周静,等. 2019年6月17日四川长宁M 6.0地震的快速测定与数据产品产出[J]. 中国地震,2019,35(3):573-583.
Allen R M, Kanamori H. The potential for earthquake early warning in Southern California[J]. Science, 2003, 300(5620):786-789.
Trnkoczy A. Understanding and parameter setting of STA/LTA trigger algorithm[C]//IASPEI New Manual of Seismological Observatory Practice. Potsdam:Deutsches GeoForschungsZentrum, 2002, 2:119.
Tsuboi S, Abe K, Takano K, et al. Rapid determination of MW from broadband P waveforms[J]. Bulletin of the Seismological Society of America, 1995, 85(2):606-613.
Wu Y M and Teng T L. Near real-time magnitude determination for large crustal earthquake[J]. Tectonophysics, 2004, 390(1/4):205-216.
