Study on current movement characteristics and numerical simulation of the main faults around Eastern Himalayan Syntaxis

Based on the survey of main faults around Eastern Himalayan Syntaxis the (EHS) and its surrounding areas, GPS observation data, the geological and geophysical data, through a comprehensive analysis, we construct a three-dimensional finite element model and study the current movement characteristics of the main faults around EHS by using the method of numerical simulation, at last obtain some preliminary understandings as follows. 1) The northern and eastern blocks of the EHS make clockwise rotation around EHS. The southern boundary of dextral strike-slip is not the Jiali fault, but the Brahmaputra fault and Apalong fault. 2) Field survey data, GPS observation, and numerical simulations show that the Jiali fault is not entirely a dextral strike-slip fault, its northwest section and the section near the top of EHS is dextral strike slip, and the southeast section changes from dextral slip to sinistral strike-slip. 3) Numerical simulation results show that the Jiali fault and Sagaing fault may not be linked, at least not simply connected; Apalong fault and Sagaing fault may be connected. 4) EHS still plays a role at present, and affects the current regional tectonic deformation together with Assam horn. Some faulting conversion and important tectonic events occurred between them or very close to the region.