CAJ | 학술논문

利用ENVISAT/ASAR和ALOS/PALSAR数据,结合两路差分干涉测量技术获得了汶川地震的同震形变信息和震前、震后地面在卫星视线(light of sight,简称LOS)方向上的形变特征.结果表明,汶川地震引起的地面形变范围广,程度大,地震形变沿断层向北北东向扩展,所形成的差分干涉条纹明显.地面的形变特征对于推断断层的性质,研究地震形变和地震发育特征具有重要的参考价值.另外,将同震雷达差分干涉测量的结果与利用USGS发布的汶川地震有限元断层模型(finite fault model)反演的LOS方向的形变进行了对比验证,发现二者在断裂带的上盘具有较好的一致性,但在下盘却有较大的误差.通过不同传感器干涉结果的对比发现,L波段的雷达干涉结果更能够反映汶川大地震在龙门山断裂带附近的地面形变信息.
이용ENVISAT/ASAR화ALOS/PALSAR수거,결합량로차분간섭측량기술획득료문천지진적동진형변신식화진전、진후지면재위성시선(light of sight,간칭LOS)방향상적형변특정.결과표명,문천지진인기적지면형변범위엄,정도대,지진형변연단층향북북동향확전,소형성적차분간섭조문명현.지면적형변특정대우추단단층적성질,연구지진형변화지진발육특정구유중요적삼고개치.령외,장동진뢰체차분간섭측량적결과여이용USGS발포적문천지진유한원단층모형(finite fault model)반연적LOS방향적형변진행료대비험증,발현이자재단렬대적상반구유교호적일치성,단재하반각유교대적오차.통과불동전감기간섭결과적대비발현,L파단적뢰체간섭결과경능구반영문천대지진재룡문산단렬대부근적지면형변신식.
Satellite differential SAR interferometry has been widely accepted as a powerful tool to map co-, post-and inter-seismic deformation. In this study, ENVISAT/ASAR and ALOS/PALSAR datasets are used for monitoring the ground displacement of the Wenchuan M_s 8.0 earthquake in China with two-pass differential interferometry, respectively. The displacement on light of sight has been archived. Results from interferograms show that the displacement caused by the shock spans along the fault zone in a large area. The characteristics of this displacement provide helpful information for the earthquake inversion. The LOS displacement on the upper plate is similar to the inversed displacement from the finite fault model of USGS while the down plate has a large error. The comparison of the differential SAR interferograms in-dictes that the L band SAR interferometry is more useful than C band for monitoring the ground displacement around the Longmenshan fault zones.