Correction of Ionospheric Artifacts in SAR Data: Application to Fault Slip Inversion of 2009 Southern Sumatra Earthquake

Interferometric synthetic aperture radar (InSAR) is one of the most popular geodetic techniques for studying earthquake-related crustal displacements. Satellite SAR signals interact with the ionosphere when they travel through it during the synthetic aperture time. The condition of the ionosphere an...

Full description

Saved in:
Bibliographic Details
Published inIEEE geoscience and remote sensing letters Vol. 15; no. 9; pp. 1327 - 1331
Main Authors Zhang, Bochen, Wang, Chisheng, Ding, Xiaoli, Zhu, Wu, Wu, Songbo
Format Journal Article
LanguageEnglish
Published Piscataway IEEE 01.09.2018
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Azimuth
Data processing
Distribution
Earthquake inversion
Earthquakes
Interferometric synthetic aperture radar
interferometric synthetic aperture radar (InSAR)
Inversion
Ionosphere
ionospheric artifacts
L-band
Radar
SAR (radar)
Satellite observation
Satellites
Seismic activity
Seismic measurements
Slip
Strain
Sumatra fault
Synthetic aperture radar
Synthetic aperture radar interferometry
Wavelength
Sumatra
Indonesia
Online AccessGet full text

Cover

More Information
Summary:Interferometric synthetic aperture radar (InSAR) is one of the most popular geodetic techniques for studying earthquake-related crustal displacements. Satellite SAR signals interact with the ionosphere when they travel through it during the synthetic aperture time. The condition of the ionosphere and its variation can significantly affect spaceborne InSAR measurements. In this letter, we use the Advanced Land Observation Satellite Phase Array-Type L-band SAR data from the 2009 southern Sumatra earthquake to evaluate the effects of the ionospheric artifacts on the slip distribution inversion of earthquake. The split-spectrum method is used to estimate and correct the ionospheric artifacts in the InSAR results. This letter shows that the long-wavelength ionospheric artifacts in the coseismic interferograms can be effectively mitigated. The slip distribution of the earthquake derived from the interferograms corrected for the ionospheric artifacts is presented. The slip distribution pattern and the magnitude of the slip are significantly refined after correcting the ionospheric artifacts.
ISSN:1545-598X
1558-0571
DOI:10.1109/LGRS.2018.2844686