Analysis on GPS Section Deformation and Strain Accumulation of Longmenshan Fault in Recent Years

Using the four periods of GPS velocity field data from 1999 to 2012,we discuss the GPS section deformation and strain accumulation of segments from Tianquan to Yingxiu and from Anxian to Guangyuan of Longmenshan Fault.In the respect of GPS section strain accumulation on the cause and degree of earthquake triggering,we compare the Lushan MS7.0 earthquake and Wenchuan MS8.0 earthquake.The results show that:( 1) The pressure rate before Lushan MS7.0 earthquake is much higher than that of 1999 ~ 2007 in this region,which is the stress adjustment process after Wenchuan MS8.0 earthquake.( 2) The interval of Wenchuan MS8.0 and Lushan MS7.0 earthquakes is so short,the Lushan MS7.0 earthquake might be affected by the adjustment process of high pressure stress along the southwest section of Longmenshan Fault after Wenchuan MS8.0 earthquake.