Movement Pattern Of Faults After Wenchuan Earthquake

Beijing,China,May 12,2008 14:28:48,Wenchuan County,Sichuan Province,China 8.0 earthquake occurred,the epicenter is located in Sichuan Province,Wenchuan County,Yingxiu town and the mouth of the junction of the town,31.01 degrees north latitude,103.42 degrees east longitude.Indian Ocean plate northward,and thus with the Asia-Europe plate squeeze each other,resulting in the Qinghai-Tibet Plateau uplift.The eastern part of the Qinghai-Tibet Plateau is affected by gravity,and the energy accumulates in the Sichuan Basin for a long time and eventually releases in the vicinity of Longmenshan.The crustal movement is closely related to the earthquake,and the earthquake is the process of stress and deformation of the crustal movement and deformation of the city,which leads to the local crustal rupture and the release of elastic strain energy.With the accumulation of high-precision GPS observations,the dynamic changes of the crust can be quantitatively monitored and the relative motion information of the crustal space-time scale can be obtained.In this paper,the construction of GPS network and the data collection of crustal movement in the Longmenshan fault zone are taken as the main research objects.The problems of engineering construction,data collection and processing,analysis and application are analyzed,and the law of fault movement after Wenchuan earthquake is obtained.Which provides an effective reference value for the application of GPS technology in crustal displacement.Taking the Longmenshan fault zone as an example,this paper uses GPS as the technology to carry out crustal movement and tectonic activity monitoring,and aims to infer the movement trend and fault activity of fault in Longmenshan fault zone.According to the existing design,24 GPS observation points are arranged in the Longmenshan fault zone,and five GPS observation networks(including the Hongkou GPS observation network,the GPS observation network,the Mianzhu GPS observation network,Jiangyou GPS observation network and Ningqiang GPS observation network)are arranged in Yingxiu-Beichuan fault zone,Anxian-Guanxian fault zone,Pingwu-Qingchuan fault zone and other areas.From 2009 to2014,each observation network was observed more than eight times.Data processing was used to select a GPS monitoring station in the observation network as the base station.Then,the GPS difference method was applied and the previous observation displacement was calculated by Pinnacle data processing software.Get the law ofmotion of the fault:(1)The GPS observation point of the Yingxiu-Beichuan fault zone has a tendency to move in the direction of the fault zone.The displacement of the northern section is relatively large,which may be due to the stress release in the middle of the fault zone after the Wenchuan earthquake.Accumulation period.(2)The GPS observation point of the Anxian-Guanxian fault zone has the tendency to move towards the fault zone,which may be due to the stress release in the fault zone after the Wenchuan earthquake.(3)The GPS observation point of Pingwu-Qingchuan-Mianxian fault zone has the tendency to move towards the fault zone,which may be due to the stress release in the fault zone after the Wenchuan earthquake.