The Wenchuan earthquake destroyed the resort on Longmen mountain fracture zone.

Characteristics and recurrence intervals of large earthquakes along the middle-northern segment of the Longmenshan fault zone

The Longmenshan Fault zone is an important thrust belt on the eastern margin of the Qinghai-Tibet Plateau,consisting of the back-range,the central and the front-range faults,which differ from each other in size and activity.

The Longmenshan fault zone is a huge multiple thrust fault at the middle on the eastern margin of the Qinghai-Tibet Plateau.

In this paper by utilizing the mobile short-line leveling data across the Longmenshan fault the variation characteristics at each observation site before and after the Wenchuan earthquake are analyzed.

The fitting results shows that:the wholly velocities of Xianshuihe and Longmenshan fault is 8.

The results show that before the earthquake the regional deformation were staged,in detail,its differential elevation and subsidence weakened and the movement of Longmenshan fault turned from active to locked,after the earthquake,the earthquake effect spreaded north-east ward along the Longmenshan fault mainly and the co-seismic deformation nearby the after s.

As a preliminary result,we measured the fast polarization azimuth and time delay of the Ps converted wave in the receiver functions at 4 stations on both sides of Longmen Shan Faults.