Calibration of an insar-derived coseimic deformation map associated with the 2011 mw-9.0 tohoku-oki earthquake

Guangcai Feng, Xiaoli Ding, Zhiwei Li, Jiang Mi, Lei Zhang, Makoto Omura

Research output: Journal article publicationJournal articleAcademic researchpeer-review

40 Citations (Scopus)

Abstract

We map the coseismic deformation of the 2011 Tohoku-Oki earthquake with data from three descending Envisat/ASAR tracks and six ascending ALOS/PALSAR tracks that cover most of northeastern Japan. Due to the inaccurate estimation of the satellite status, orbital ramps commonly exist in the coseismic interferograms, which resulted in inconsistency among the deformation maps released by several research groups. In this letter, calibration has been performed to accurately remove these ramps by a 2-D quadratic-phase model derived based on GPS measurements from the ARIA team at the Jet Propulsion Laboratory and Caltech. The average RMS of the interferometric synthetic aperture radar (InSAR) measurements, as compared with GPS measurements at the validation stations, has decreased from 17.8 to 7.7 cm after the orbital ramp correction is made, indicating that much more accurate InSAR measurements are achieved. The corrected coseismic deformation from the InSAR measurements is consistent with not only the GPS observations at the individual GPS stations but also with the coseismic deformation interferogram from interpolated GPS observation in the SAR viewing directions. The corrected coseismic deformation measurement results show a maximum line-of-sight displacement of up to 3.7 m from the ascending PALSAR tracks and 2.4 m from the descending ASAR tracks, respectively.
Original languageEnglish
Article number6058580
Pages (from-to)302-306
Number of pages5
JournalIEEE Geoscience and Remote Sensing Letters
Volume9
Issue number2
DOIs
Publication statusPublished - 1 Jan 2012

Keywords

  • Coseismic deformation
  • Crbital ramps correction
  • Interferometric synthetic aperture radar (InSAR)
  • Tohoku-Oki earthquake

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Electrical and Electronic Engineering

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