Measuring two-dimensional deformation using a single InSAR pair

作者：Bo Hu^*; Han-Sheng Wang; Li-Ming Jiang; Shen Qiang

来源：Advances in Information Sciences and Service Sciences, 2012, 4(12): 243-249.

DOI：10.4156/AISS.vol4.issue12.28

• Azimuth direction
• ChiChi earthquake
• Fault position
• Great earthquake
• Ground deformations
• InSAR
• Interferometric synthetic aperture radars
• Line of Sight
• One dimension
• RMS
• RMS errors

Interferometric Synthetic Aperture Radar (InSAR), a very effective technique for measuring ground deformation, provides measurements in only one dimension, along the radar line of sight, but not insensitive to along-track displacement. The best existing method to obtain the along-track displacement involves pixel tracking, the precision can reach dm level. In some situation, pixel tracking measurement is a good complement to the traditional InSAR measurement, it can clearly identify the fault position and provide azimuth and range deformation even in an incoherent area. In this study, we illustrate the use of pixel tracking with an example taken from the Mw 7.6 21 Sep 1999 Chi-Chi great earthquake in Taiwan. The results show that the earthquake mainly ruptured along the Chelungpu fault, which is a main north-to-south trending fault with length of 80 km and show clear thrust behavior with small angle dipping to the east. Comparisons with displacements inferred from 10 GPS stations, we evaluated the accuracy of pixel tracking and found that the RMS errors for range direction is 5.1 cm and for azimuth direction is 6.2 cm.

• 出版日期2012