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为考察内蒙古及邻区地震监测能力的时空分布特征,并为该地区的地球科学研究和测震台网的进一步优化布局提供科学参考,根据内蒙古测震台网发展的各历史阶段,分析了地震定位台站数据和台站张角的时空分布,并采用完整性震级范围(EMR)方法,研究了最小完整性震级Mc的时空分布特征.结果表明,台站张角和台站数的时空演化能够定性、客观地反映内蒙古测震台网台站数量由少到多,地震监测能力由弱到强逐步完善的发展过程.而EMR方法给出的Mc时空分布,可定量描述内蒙古测震台网各历史时期Mc时空的监测能力变化.结果显示,1990—2001年的模拟记录期间,呼和浩特地区Mc值约为ML2.0,与蒙古交界地区可达ML3.0以上.2002—2007年的模拟和数字化并行期间,内蒙古中西部以及与外省交界地区监测能力有所提升.2008—2012年的“十五”数字台网运行期间,测震台网的建设有效克服了行政区划狭长、台站布局不合理的现状,绝大多数地区ML2.2以上地震基本完整.相关研究将为内蒙古地区地震观测系统的进一步优化布局、地震观测产品用于地震预测预报研究和地震危险性分析提供重要的参考依据.
In order to investigate the spatial and temporal distribution characteristics of the seismic monitoring capability in Inner Mongolia and its neighboring areas and to provide scientific references for the further optimization of geosciences and seismograph networks in this area, according to the historical stages of the development of the seismograph network in Inner Mongolia, Spatial and temporal distribution of station data and station opening angle, and using the method of completeness magnitude range (EMR) to study the temporal and spatial distribution of minimum completeness magnitude Mc.The results show that the space-time evolution of station opening angle and station number Can qualitatively and objectively reflect the development process of the seismograph network in Inner Mongolia from less to more and the seismic monitoring capability from weak to strong and gradually improve.While the EMR method gives the Mc spatial and temporal distribution that can quantitatively describe Inner Mongolia Seismic Network The results show that during the period from 1990 to 2001, the Mc value in Huhhot is about ML2.0 and that in the border area with Mongolia is up to ML3.0. The simulation of 2002-2007 During the parallelization of digitization, the monitoring capability in the central and western part of Inner Mongolia and at the border with other provinces has been raised. During the period of “15” digital network operation in 2008-2012, the construction of seismograph network is effective With the narrow administrative divisions and unreasonable station layout, the ML2.2 earthquakes are basically complete in the vast majority of regions, and the related research will further optimize the seismic observation system in Inner Mongolia. The seismic observation products are used in earthquake prediction and prediction and earthquakes Risk analysis provides an important reference.