Abstract:We select multiple seismic events from seismic-prone regions in the world. Taking Jinghe earthquake as an example, we study the selection method of fitting region for atmospheric error correction based on DEM. Then, to analyze the accuracy and applicability of the correction, we carry out the atmospheric phase delay correction of the co-seismic deformation field based on DEM and GACOS data. The results show that when the phase-elevation correlation coefficient after deducting the main co-seismic deformation region is greater than 0.4, the atmospheric error correction must be made to the obtained deformation field, and the noise can be reduced by 1-4 cm after correction. When the correlation coefficient is 0.4-0.8, the correction accuracy can be verified by the two methods. When the correlation coefficient is greater than 0.8, only DEM fitting atmospheric error distribution function can be used for correction. The atmospheric error correction based on GACOS is universal and can achieve better results in plain areas where atmospheric noise is more serious and is not correlated with terrain.
BAI Xixuan,ZHANG Bingqiang,XU Hao et al. Atmospheric Error Correction of InSAR Co-Seismic Deformation Based on DEM and GACOS[J]. jgg, 2023, 43(2): 191-197.