长距离动态GPS数据处理方法与汶川地震引起的动态地壳形变特征分析
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摘要
利用长距离GPS动态数据处理方法,根据四川GPS网地震前后的观测数据,计算出了四川GPS网各站点地震前后的位移量。以相对稳定的雅安站为参考站,计算出了绵阳站和郫县站的动态变形序列。汶川地震动态地壳变形分析结果表明,地震期间,绵阳站和郫县站的主运动朝向西北方向,同时伴随有小幅摆动。在高程方向,绵阳站出现先上升后下降的运动特征,郫县站出现上下波动特征。
Based on the analysis of the key problems about long distance kinematic GPS data processing,we caculated the displacements of the stations in Sichuan GPS network using the data before and after 5.12 Wenchuan Earthquake.The accuracy of long distance kinematic GPS data processing was analyzed.Kinematic deformation series of Mianyan and Pixian were obtained using Yaan as a reference station.Decomposing the deformation series into mountain Longmen fault direction and its orthogonal direction,the kinematic deformation features of several stations were obtained.Results about kinematic crustal deformation of Wenchuan Earthquake show that Mianyan and Pixian move towards northwest with small amplitude of swing during the earthquake.The maximum kinematic displacements of Mianyang and Pixian were 49.2 cm and 114.1 cm respectively.In the vertical direction,the height of Mianyan decreased after uplifting 10 cm.The height of Pixian fluctuated periodically and the fluctuation range was ±13 cm.
Based on the analysis of the key problems about long distance kinematic GPS data processing,we caculated the displacements of the stations in Sichuan GPS network using the data before and after 5.12 Wenchuan Earthquake.The accuracy of long distance kinematic GPS data processing was analyzed.Kinematic deformation series of Mianyan and Pixian were obtained using Yaan as a reference station.Decomposing the deformation series into mountain Longmen fault direction and its orthogonal direction,the kinematic deformation features of several stations were obtained.Results about kinematic crustal deformation of Wenchuan Earthquake show that Mianyan and Pixian move towards northwest with small amplitude of swing during the earthquake.The maximum kinematic displacements of Mianyang and Pixian were 49.2 cm and 114.1 cm respectively.In the vertical direction,the height of Mianyan decreased after uplifting 10 cm.The height of Pixian fluctuated periodically and the fluctuation range was ±13 cm.
引文
[1]唐文清.基于GPS监测的青藏高原东部及邻区地壳运动形变特征研究[D].成都:西南交通大学,2006
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[2]乔学军,陈顒,王琪,等.首都圈地区现今地壳运动的GPS观测与构造活动模拟[J].武汉大学学报.信息科学版,2008,33(7):692-697
[3]黄丁发,熊永良,袁林果.全球定位系统(GPS):理论与实践[M].成都:西南交通大学出版社,2006
[4]熊永良,黄丁发.一种可靠的含变形区间约束条件的GPS变形监测单历元求解算法[J].武汉大学学报.信息科学版,2001,26(1):51-56
[5]范国胜,焦青.汶川地震前川滇地区断裂活动特征分析[J].大地测量与地球动力学,2008,28(6):27-31
[6]张四新,张希,王双绪,等.汶川8.0级地震前后地壳垂直形变分析[J].大地测量与地球动力学,2008,28(6):43-46
[7]李忠权,应丹琳,郭晓玉,等.龙门山汶川地震特征及构造运动学初析[J].成都理工大学学报(自然科学版),2008,35(4):426-430
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