基于概率完备震级评估首都圈地震台网检测能力  

Assessment of detectability of the Capital-circle Seismic Network by using the probability-based magnitude of completeness(PMC) method

作　　者：李智超[1] 黄清华[1] 

机构地区：[1]北京大学地球与空间科学学院地球物理学系,北京100871

出　　处：《地球物理学报》2014年第8期2584-2593,共10页Chinese Journal of Geophysics

基　　金：国家杰出青年基金项目(41025014);高等学校博士学科点专项科研基金(20120001110073)资助

摘　　要：完备震级是评估区域地震台网检测能力的一个定量指标,本文采用能反映区域地震台网检测能力的时空分布细节特征的概率完备震级分析方法,对首都圈地震台网的检测能力进行了研究,通过对首都圈2002 2009共8年的地震目录和台站资料的分析处理,得到了首都圈地震台网的完备震级时空分布,据此对台网的检测能力进行了评估,并结合模拟结果探讨了提升台网检测能力的可能性.结果表明:首都圈地震台网的整体检测能力较强,北京地区的检测能力尤其突出,但部分区域检测能力仍有一定的提升空间;模拟结果表明,在东北、西北、西南等位置增加台站可能有助于进一步提高台网的检测能力.相关研究结果可能对未来首都圈地震台网的优化具有参考意义.The magnitude of completeness is a key quantitative index to assess the detectability of regional seismic network. This paper deals with the detectability of the Capital-circle Seismic Network by adopting the probability-based magnitude of completeness （PMC） method which can reveal the detailed spatio-temporal characteristics of regional seismic network detectability. The earthquake data （2002-2009） and station information of China Earthquake Administration （CEA） are chosen for this study. This paper aims to estimate network detectability and discuss the possibility of improving the network detectability according to the spatio-temporal distribution of completeness magnitudes and the simulation results. The results show that the detectability of the Capital-circle Seismic Network is high in most regions, although the detectability in a few regions needs to be enhanced. Simulation results suggest that increasing stations may further enhance the detectability of the seismic network. The related results in this paper may be helpful for the optimization of the Capital-circle Seismic Network in the future.

关 键 词：PMC方法 首都圈地震台网 完备震级 虚拟台站 

分 类 号：P315[天文地球—地震学]