Characteristic Of Datong Basin Present Crustal Deformation

Datong basin is a typical region where occur geological disasters frequently and tectonic activate strongly in Fenwei basin. Especially the ground fissure in city of Datong is the most typical and serious geological hazards in recent years, and harm to the construction. So in order to further understand the relationship between movements of crustal deformation characteristics and geological disasters in Datong basin, this paper studied and researched following point by the obtained velocity field based on GPS data measuring in Datong basin:Fit the observation data to establish horizontal and vertical velocity field by using multisurface function, and according to the established model of horizontal velocity field motion, solve the strain parameters of Datong basin by the way of compute partial derivative of the model, and obtain the regional strain field. From the strain face inflation diagram and the shear stress strain diagram, we can find that Datong basin significant strain area is located in Datong city and ground fissures have passed the high value area of the strain in Datong city. Therefore, under the action of these tensions, meanwhile combine with other factors which lead to ground subsidence such as overdraft ground water, eventually lead to the development of the ground fissure disasters.Get a Preliminary result of Kouquan fault locking rate by using Def Node Negative Dislocation Model trough measured and fitted velocity field data. Inversion results shows that the locking degree in middle sector of the Kouquan fault is generally about 0.4, and more creep slip than stick slip. Therefore, as an active fault, it should be considered the slow destructive effect caused by diastrophism and take precautions to protect them.