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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.
In order to achieve a scientific and accurate assessment of the monitoring capability of the regional seismograph network in Shandong Province, the spatial and temporal distribution characteristics of the seismic monitoring capability in Shandong and its neighboring areas are analyzed to provide a scientific basis for the further optimization of the seismological research and seismograph networks in this area. By using the probability-based integrity magnitude (PMC) method, the detection probabilities of peripheral seismic events at 117 stations in Shandong Seismic Network, the composite detection probabilities of the seismograph network and the minimum completeness magnitude are calculated. To assess the monitoring ability of the seismograph network.The single detection probability results show that the PMC method can objectively reflect the monitoring ability of 117 stations on the earthquake events and the probability of detection varies with the magnitude and the epicenter distance And the stations in the middle and southern sections of the Yishu fault zone have higher monitoring ability for earthquakes with low earthquake magnitude.The results of the synthetic detection probabilities show that the areas with high detection probability are mainly concentrated in the Jiaodong Peninsula and Yishu belt central-southern section, and close to the Shandong province of Luxi and Lubei area is less capable of monitoring the minimum completeness of the magnitude of the results also reflect a similar law at the same time, PMC method can The effect of detecting different depth on the spatial distribution of detection probability.