基于PMC方法的山东省测震台网监测能力评估

发布时间：2018-03-31 23:23

本文选题：最小完整性震级　切入点：监测能力　出处：《地球物理学进展》2016年06期

【摘要】：为了实现对山东区域测震台网监测能力的科学准确的评估,分析山东及邻区地震监测能力的时空分布特征,为该区的地震研究和测震台网的进一步优化布局提供科学依据.本文利用"基于概率的完整性震级"(PMC)方法,通过计算山东测震台网的117个台站对周边地震事件的检测概率、测震台网的合成检测概率以及最小完整性震级,来评估测震台网的监测能力.单台检测概率结果显示,PMC方法可客观反映117个台站对地震事件的监测能力,在距离台站较近的区域,检测概率随着震级和震中距的增大而增大,处于沂沭断裂带中南段的台站对低震级档的地震有较高的监测能力.合成检测概率结果显示,检测概率高值区域主要集中在台站密集的胶东半岛和沂沭带中南段,而靠近山东省界的鲁西和鲁北区域则监测能力较差.最小完整性震级的结果也反映了类似的规律.同时,PMC方法还可以检测不同深度对检测概率空间分布特征的影响.
[Abstract]:In order to realize the scientific and accurate evaluation of the monitoring ability of the Shandong regional seismograph network, the spatial and temporal distribution characteristics of the seismic monitoring ability in Shandong and its adjacent areas are analyzed. In this paper, the probabilistic integrality magnitude (PMC) method is used to calculate the detection probability of the peripheral seismic events at 117 stations in Shandong Seismic Network. The synthetic detection probability and minimum integrity magnitude of seismic network are used to evaluate the monitoring ability of seismic network. The results of single station detection probability show that the PMC method can objectively reflect the monitoring ability of 117 stations to earthquake events. In the region close to the station, the detection probability increases with the increase of magnitude and epicenter distance. The station in the middle and south segment of Yishu fault zone has a higher monitoring ability to the earthquake with low magnitude. The high value region of the detection probability is mainly concentrated in the central and southern sections of the Jiaodong Peninsula and Yishu belt where stations are concentrated. The results of minimum integrality magnitude also reflect a similar rule. At the same time, the PMC method can also detect the influence of different depth on the spatial distribution of detection probability.
【作者单位】：山东省地震局;
【基金】：地震科技星火计划(XH15026) 中国地震局震情跟踪青年课题项目(2015010106) 山东省地震局重点基金项目共同资助
【分类号】：P315.78

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