南北地震带地震台网监测能力评估的不同方法比较研究

发布时间：2018-08-28 15:03

【摘要】：为探讨不同地震台网监测能力评估方法的结果差异性及其原因,本文选用目前国际上比较前沿的"基于概率的完整性震级"(PMC)方法和"完整性震级范围"(EMR)方法,以及中国地震台网常规采用的"震级-最大距离"方法,对2008年10月1日—2015年9月17日南北地震带地区表征地震监测能力的最小完整性震级进行了比较研究.研究中考虑了以往关注不够的地震观测质量一致性问题,统一采用至少3个台站记录的地震资料.结果显示,3种方法的结果差异显著,最小完整性震级的差值在南北地震带个别地区甚至可达ML2.0,其中,PMC方法获得的最小完整性震级Mp值在32°N以北地区显著低于其它两种方法,震级-最大距离方法获得的最小完整性震级Mr低值结果仅与高台站密度地区有关,与包括EMR方法获得的最小完整性震级McEMR相比较在统计均值上则呈McEMRMpMr.进一步对各地震台站的地震检测能力进行评分,结果显示,台站运维水平和对记录地震分析的完整程度,是造成Mp值显著不同于其它方法结果的主要原因,而是否选用相同的记录台站数量等数据质量约束标准,会造成EMR方法与其它方法结果的显著差异.因此,考虑到地震台网运行的实际情况和不同评估方法的计算原理,推荐PMC方法用于地震监测能力的评估.
[Abstract]:In order to discuss the difference of the results and the causes of the different methods for evaluating the monitoring ability of seismic networks, this paper selects the "probability-based integrality magnitude" (PMC) method and the "integrality magnitude range" (EMR) method, which are relatively advanced in the world at present. As well as the "magnitude-maximum distance" method commonly used by the China Seismic Network, a comparative study on the minimum integrity magnitude of the seismic monitoring capability in the north-south seismic belt from October 1, 2008 to September 17, 2015 is carried out. In this study, the consistency of seismic observation quality is considered, and the seismic data recorded by at least three stations are uniformly used. The results show that there are significant differences among the three methods, and the difference of minimum integrity magnitude can even reach ML2.0, in some areas of the north and south seismic belt. The Mp value of minimum integrity magnitude obtained by PMC method is significantly lower than that of the other two methods in the area north of 32 掳N. The Mr low value of minimum integrity magnitude obtained by the method of magnitude and maximum distance is only related to the density area of the high station, and compared with the minimum integrity magnitude McEMR obtained by the EMR method, it is McEMRMpMr. on the statistical average. Furthermore, the seismic detection ability of each seismic station is evaluated. The results show that the operation and maintenance level of the station and the integrity of the recorded seismic analysis are the main reasons for the significant difference between the Mp values and the results of other methods. Whether or not the same data quality constraints such as the number of stations recorded will result in significant differences between the EMR method and other methods. Therefore, considering the actual operation of seismic network and the calculation principle of different evaluation methods, the PMC method is recommended for the evaluation of seismic monitoring ability.
【作者单位】：中国地震局地球物理研究所;
【基金】：中国科学院国际合作局对外合作重点项目(131551KYSB20160002)资助
【分类号】：P315.78

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