高频GPS动态监测地表形变的试验与研究
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摘要
设计了位移形变模拟试验场并进行位移形变模拟试验,利用Bernese 5.0软件的单历元单点定位功能,处理并分析了位移模拟形变试验获取的1 Hz GPS数据。并以2008年5月12日汶川地震为例,获取了震中附近3个GPS站(成都、简阳和郫县)震前的短临位移过程及震后短时间的动态时变序列,结果显示各站的形变结果在时间上具有很好的一致性。利用动态时序的地震波到时和震中距离估计地震波地壳平均速度为3.17 km/s。
The experimental base for surface deformation simulation is designed and simulation test is carried out,and 1 Hz GPS data obtained from the simulation test is processed and analyzed with the single epoch single point positioning of the Bernese 5.0 software.Taking the Wenchuan earthquake on May 12,2008 as an example,we obtain the time series of the short-impending displacement before the earthquake and shortly after the earthquake at 3 GPS stations:CHDU,JYAN,PIXI.The results after data processing show good consistency among the deformation results at all stations in time.On the basis of arrival time of seismic wave recorded in kinematic time series and the distance between 1 Hz GPS stations and the epicenter,the estimated average velocity of seismic wave in the crust is 3.17 km/s.
The experimental base for surface deformation simulation is designed and simulation test is carried out,and 1 Hz GPS data obtained from the simulation test is processed and analyzed with the single epoch single point positioning of the Bernese 5.0 software.Taking the Wenchuan earthquake on May 12,2008 as an example,we obtain the time series of the short-impending displacement before the earthquake and shortly after the earthquake at 3 GPS stations:CHDU,JYAN,PIXI.The results after data processing show good consistency among the deformation results at all stations in time.On the basis of arrival time of seismic wave recorded in kinematic time series and the distance between 1 Hz GPS stations and the epicenter,the estimated average velocity of seismic wave in the crust is 3.17 km/s.
引文
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5刘刚,等.用超长基线结算分析汶川地震动态形变特征[J].大地测量学与地球动力学,2011,(5):14-19.
6顾国华,等.汶川大地震前后GPS观测的精密单历元解得到的震区地壳运动[J].地震学报,2011,33(3):319-326.
7 Dach R,et al.User Manual of Bernese GPS sSoftware ver-sion 5.0[M].AIUB Astonomical Institute,University ofBern,2007.
8方荣新,高采样率GPS数据非差精密处理方法及其在地震学中的应用研究[D].武汉大学,2010.
2 Kristine M,et al.Using 1-Hz GPS data to measure deforma-tion caused by the Denali fault earthquake[J].Science,2003,300:1 421-1 424.
3 Yusuke Yokota,et al.Ability of 1-HZ GPS to infer thesource process of a medium-sized earthquake:the 2008Iwate-Miyagi Nairiku,Japan,earthquake[J].Geophys ResLett.,2009,36(L12301).
4 Chen Ji,et al.Slip history of the 2003 Simeon earthquakeconstrained by combining 1-Hz GPS,strong motion,andteleseismic data[J].Geophys Res Lett.,2004,31(L17608).Doi:10.1029/2004GL020448.
5刘刚,等.用超长基线结算分析汶川地震动态形变特征[J].大地测量学与地球动力学,2011,(5):14-19.
6顾国华,等.汶川大地震前后GPS观测的精密单历元解得到的震区地壳运动[J].地震学报,2011,33(3):319-326.
7 Dach R,et al.User Manual of Bernese GPS sSoftware ver-sion 5.0[M].AIUB Astonomical Institute,University ofBern,2007.
8方荣新,高采样率GPS数据非差精密处理方法及其在地震学中的应用研究[D].武汉大学,2010.
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