ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
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Articles | Volume IV-3
ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci., IV-3, 205–209, 2018
https://doi.org/10.5194/isprs-annals-IV-3-205-2018
ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci., IV-3, 205–209, 2018
https://doi.org/10.5194/isprs-annals-IV-3-205-2018

  23 Apr 2018

23 Apr 2018

COSEISMIC DISPLACEMENT ANALYSIS OF THE 12 NOVEMBER 2017 MW 7.3 SARPOL-E ZAHAB (IRAN) EARTHQUAKE FROM SAR INTERFEROMETRY, BURST OVERLAP INTERFEROMETRY AND OFFSET TRACKING

Sanaz Vajedian1 and Mahdi Motagh2 Sanaz Vajedian and Mahdi Motagh
  • 1Institute of Photogrammetry and GeoInformation (IPI), Leibniz Universität Hannover, Germany
  • 2GFZ German Research Center for Geosciences, Department of Geodesy, Section of Remote Sensing, 14473 Potsdam, Germany

Keywords: SAR interferometry, Offset tracking, Multi Aperture Interferometry (MAI), Spectral diversity (SD), Burst Overlap Interferometry, Earthquake, seismic modelling, Landslide

Abstract. Interferometric wide-swath mode of Sentinel-1, which is implemented by Terrain Observation by Progressive Scan (TOPS) technique, is the main mode of SAR data acquisition in this mission. It aims at global monitoring of large areas with enhanced revisit frequency of 6 days at the expense of reduced azimuth resolution, compared to classical ScanSAR mode. TOPS technique is equipped by steering the beam from backward to forward along the heading direction for each burst, in addition to the steering along the range direction, which is the only sweeping direction in standard ScanSAR mode. This leads to difficulty in measuring along-track displacement by applying the conventional method of multi-aperture interferometry (MAI), which exploits a double difference interferometry to estimate azimuth offset. There is a possibility to solve this issue by a technique called “Burst Overlap Interferometry” which focuses on the region of burst overlap. Taking advantage of large squint angle diversity of ~1° in burst overlapped area leads to improve the accuracy of ground motion measurement especially in along-track direction. We investigate the advantage of SAR Interferometry (InSAR), burst overlap interferometry and offset tracking to investigate coseismic deformation and coseismic-induced landslide related to 12 November 2017 Mw 7.3 Sarpol-e Zahab earthquake in Iran.