【摘要】 通过对2015年4月15日内蒙古阿拉善左旗5.8级地震序列和地震构造作了初步分析,该地震序列为主余型,发震构造为蹬口—本井断裂。主震前在鄂尔多斯西缘中小地震活动明显增强,但在震中附近地震活动不突出,存在银川地震窗、地震空区、空间参数扫描A值等测震学年度异常;震前出现突出的短临前兆异常有阿拉善左旗倾斜NS向、银川石英摆倾斜EW向、石嘴山视电阻率EW向等。其异常分析可为今后宁夏及邻区中强以上地震的震例总结和预测提供参考依据。更多还原

【Abstract】 This paper makes a preliminary analysis on the Alashan Zuoqi Banner of Inner Mongolia 5.8 earthquake sequence and seismic structure on April 15, 2015, it’ s considered to be the main aftershock type earthquake sequence and the seismogenic structure is Dengkou-wells fracture. The small-moderate earthquake activity increased significantly in the western margin of Ordos before the main shock, however, the seismic activity in the vicinity of the epicenter was not prominent, and there were seismometry annual anomalies, such as Yinchuan seismic windows, seismic gaps and spatial parameter scanning A value; Before the earthquake, it appeared short-impending precursor anomalies that Alashan Zuoqi Banner inclined to NS, the quartz pendulum tiltmeter of Yinchuan inclined to EW, the apparent resistivity of Shizuishan EW and so on. The abnormal analysis can provide reference for the earthquake case summarization and prediction in Ningxia and its neighboring areas.更多还原