Abstract：The paper firstly analyzes the relationship between the area of Bouguer gravity anomaly and faults. It mainly utilizes measured gravity section (Suhaitu-Pingluo-Etuokeqi), and gets a more exquisite section of the Bouguer gravity anomaly, and a figure of normalized full gradient of the section of the Bouguer gravity anomaly (GH). The results of the section show that: 1) The main active faults are corresponding with GH contour strip or cut local region, which generally show strong deformation characteristics. For example, the Bayanwulashanshanqian fault (F1) or the southeast boundary of Alxa block is in accord with the western change belt of GH| the belt is about 10 km wide and extends to about 30 km. 2) The seismogenic structure of the Alashanzuoqi Ms5.8 earthquake is not Dengkou-Benjing fault (F3), but is controlled by F3. 3) The Yinchuan-Pingluo fault (F6) is the seismogenic structure of Pingluo Ms8.0 earthquake, and its focal depth is about 15 km.
WU Guiju,SHEN Chongyang,TAN Hongbo et al. Tectonic Implication of Images of Bouguer Gravity Anomaly and Its
Normalized Total Gradient in 2015 Alashanzuoqi Ms5.8 Area[J]. jgg, 2015, 35(6): 936-940.
