Abstract:A spatiotemporal evolution characteristic image of the gravity field in the north Tianshan area is obtained using the multi-stage mobile gravity data from 2014 to 2019 combined with the classical adjustment calculation of absolute gravity points. The material migration pattern of main structural parts in north Tianshan area is obtained using the visualization method of gravity interval difference. Finally, the density of crust at different depths in the middle part of north Tianshan mountain is simulated by using compact gravity inversion method.The results shows that the best depth of crustal material density change is 30 to 40 km.The positive crustal density change area is basically located in the north slope of north Tianshan mountain and the southern edge of Junggar basin, which indicates that the material migration in this area is relatively concentrated, or that the crust presents the tendency of subsidence. However, near the mountain body, the change of material density presents a negative value; the crust is in the process of uplifting due to the tectonic stress of the mountain.
LIU Daiqin,XUAN Songbai,WANG Xiaoqiang et al. Study on the Characteristics of Recent Gravity Field and Crustal Density in North Tianshan Area[J]. jgg, 2021, 41(5): 459-465.