【摘要】 本文根据历史强震资料、有感历史地震资料以及仪器地震记录,研究了鄂尔多斯地块内部地震活动的时间和空间分布特征,探讨了鄂尔多斯地块周缘地震带地震活动与地块区内地震活动的关系。研究表明,鄂尔多斯地块区内曾有多次MS≥5.0破坏性地震发生,为典型的中强地震活动区;地块区地震活动具有时空不均匀性,时间分布呈现出明显的分期特征,空间分布东南强西北弱;地块内部MS≥5.0中强地震活动与其周缘地震强震活动关系密切且主要受其东缘和南缘汾渭地震带MS≥6.0地震活动的控制。更多还原

【Abstract】 The temporal-spatial distribution characteristics of earthquakes in the Ordos block are studied by using the historical earthquake data,the instrument data of the regional seismic network around the Ordos block and the historical felt earthquake data,and then discussing the relationship between seismicity in the Ordos block and seismicity around Ordos block.The result shows that the Ordos block is a moderately strong earthquake active region and there are many M_S≥5.0 destructive earthquakes in the Ordos block.The temporal-spatial distribution of earthquakes in Ordos block is sometimes asymmetric.The temporal distribution of earthquakes has characteristics of active in stages,and the activity of earthquakes in southeast Ordos block is stronger than in northwest Ordos block.The moderate earthquakes with M_S≥5.0 in the Ordos block are controlled by the M_S≥6.0 earthquake around Ordos block.更多还原