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《Editoral Board of Geomatics and Information Science of Wuhan University》 2001-03
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Present-day Crustal Movement Speed Field of China Continent Block Using Local Repeated GPS Network

LIU Jingnan 1 SHI Chuang 2 XU Caijun 2 JIANG Weiping 2 (1 Presidential Secretariat,Wuhan University,Luojia Hill,Wuhan,China,430072) (2 GPS Research Center,Wuhan University,129 Luoyu Road,Wuhan,China,430079) [FK(W25。40ZQ]  
Since 1992,China has established many large_scale high precision GPS crustal deformation monitoring network,including state high precision GPS Order_A network,China crustal deformation monitoring network,crustal deformation monitoring network in Qinghai_Tibet plateau,north China network,southeast coastal GPS network and Sinkiang network.GPS measurements of above GPS crustal monitoring networks are collected and they are reprocessed in ITRF97 frame.A complete GPS crustal movement image and speed field with uniform frame,the largest coverage and the most stations are obtained.Finally ,a primary geo_scientific explanation of the speed field is given in the paper. China continent is located in the southeast of Eurasian plate.Its special tectonic location and lithographic structure after long_period complex evolvement makes the continental rock layer divided into several plates.And the main tectonic deformation happens at the faulted zone,folded belt and fault depression belt at the border of these plates,while the relative deformation inside the plates is small.There are mostly seismic active belts along the border of plates,thus the research of movement law and relative deformation is the hotspot that catches the attention of the geodetic world.According to the convergence velocity of plates,the uplifting extent of Pliocene epoch leveling and the gliding velocity of the fault,the compression velocity of each fault mountain system in the west of China continent can be estimated,and the movement velocity of each plate relative to Siberian land mass can be deduced.Moreover,the Euler poles and angular velocities of China continent blocks are figured by active fault gliding velocity according to plate geometry,and then average movement velocity vectors of each block are calculated,but they are all average value on the scale of geology.Movement images and relative movement images of each plate or block relative to one ITRF frame are obtained.However,China continent lacks a complete integer movement image of each main plate based on GPS monitoring.And surveying and data analyzing and processing of these GPS networks are accomplished by different units,thus the crustal movement images established by each GPS network are not the same due to different data processing method and datum [FK(W39。40ZQ]in analyzing,which influences the proper utilization of GPS observation data and correct geoscientific explanation. This paper,collecting 6 items of materials of various high precision GPS crustal monitoring networks of China since 1992,uses uniform data processing method to reprocess data,carries out adjustment and deduces to the same coordinate frame datum,thus the complete GPS crustal movement image and speed field with uniform frame,the largest coverage and the most stations are obtained.This paper introduces the thought,method and final result of this work,and gives a primary geo_scientific explanation. The bearing and grade of the continent plates by GPS are in accordance with those by geological model,with difference in one or two,mainly the difference of nearly 900 in direction in Erdos plate.In the speed fields given by GPS,China continent land mass movement shows the difference in the west and the east,besides different movement velocity vector characteristics in each area.In the west the trend is moving towards the north and northeast,while in the east the trend is creep towards the south and southeast,with a huge north by north dextral shear zone. From GPS speed field,we can say the collision of Eurasian plate and Indian plate restrict the movement and deformation of China continent,especially in the middle west area.At the same time,the Pacific plate is diving towards the west,and the impact to China continent,especially northeast China land mass through Japanese Gulf can not be ignored.China continent is located in the intersection of Indian plate,Eurasian plate and Pacific plate,and the internal tectonic movement and deformation are the result of relative action.In the southwest side of China continent,Indian plate
【Fund】: 国家自然科学基金!资助项目 (499740 0 1) ;; 国家攀登计划资助!项目 (970 2 310 0 3)
【CateGory Index】: P228.4
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