【摘要】 选取中国大陆西部地区1970年以来的6 5级以上强震,对其震前周边地区中等地震活动的分析研究表明,88%的6 5级以上强震前震源区及附近区域ML4 0～5 0级中等地震呈现出大面积平静现象。研究认为平静-发震为该区强震的主要发震模式。平静时段以6～15个月为主,平均为10个月左右。强震发生部位在平静区内部者居多,其余位于平静区边缘地带。该异常特征可以作为未来强震时间、地点预测的主要依据之一。更多还原

【Abstract】 The seismicity of middle earthquakes around the areas of the earthquakes with Ms≥6.5 since 1970 in western China mainland is analyzed.The result shows that the large quiet gaps of earthquakes with ML≥4.0 appear in epicenters of strong earthquakes with Ms≥6.5 and their neighboring areas (almost 88%).The occurrence model is quiet-earthquake.The quiet time is 6～15 months,meanly 10 months.Strong earthquakes occur in quiet gaps or the marginal gaps.These characteristics may predict the time and place of strong earthquakes.更多还原