The Longmen thrust belt is located between the Sichuan Basin and eastern margin of the Qinghai-Tibetan plateau, whose characterized topography and active structures in this area must be very important for understanding the tectonic evolution of the eastern margin of the plateau and the western Sichuan Basin from Late Cenozoic. So far, most of study on the area was based on the "plateau" point. We tried to analyze the features of the topography and active structures in the area by both of the earthquakes occurring in recent twenty years and Digital Elevation Model (DEM) by the help of 3d-visualization software. Our results were as follows. 1) By the characteristics of topography and the distribution of earthquakes, the Longmen Mts. could be divided into two segments, with a boundary near Anxian county. 2) the active margin of the eastern of the plateau extended northeastwards along the southern sector of the Longmen Mountains, then turned to the north along the Minshan Mts. near Anxian. 3)The earthquakes diffused into the western Sichuan Basin and appeared as a crustal wedge-shaped form toward the interior of the basin. In short words, all of the seismicity, topography and the seismic profile suggested the possibility of tectonic shortening in the Longmen Mts. and in the western Sichuan Basin from Late Cenozoic.
Jia Qiupeng,Jia Dong,Zhu Ailan et al. ACTIVE TECTONICS IN THE LONGMEN THRUST BELT TO THE EASTERN QINGHAI-TIBETAN PLATEAU AND SICHUAN BASIN:EVIDENCE FROM TOPOGRAPHY AND SEISMICITY[J]. Chinese Journal of Geology, 2007, (1): 31-44.