期刊
REMOTE SENSING
卷 8, 期 5, 页码 -出版社
MDPI
DOI: 10.3390/rs8050376
关键词
Illapel Earthquake; Sentinel-1A; spectral diversity; InSAR; 2D deformation
类别
资金
- National Natural Science Foundation of China [41574005, 41474007, 41404013]
- Fundamental Research Funds of Central South University [2014zzts049]
In this study, we mapped the co-seismic deformation of the 2015 Mw 8.3 Illapel, Chile earthquake with multiple Sentinel-1A TOPS data frames from both ascending and descending geometries. To meet the requirement of very high co-registration precision, an improved spectral diversity method was proposed to correct the co-registration slope error in the azimuth direction induced by multiple Sentinel-1A TOPS data frames. All phase jumps that appear in the conventional processing method have been corrected after applying the proposed method. The 2D deformation fields in the east-west and vertical directions are also resolved by combing D-InSAR and Offset Tracking measurements. The results reveal that the east-west component dominated the 2D displacement, where up to 2 m displacement towards the west was measured in the coastal area. Vertical deformations ranging between -0.25 and 0.25 m were found. The 2D displacements imply the collision of the Nazca plate squeezed the coast, which shows good accordance with the geological background of the region.
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