Small Baseline Subset (SBAS) Time-Series Analysis of InSAR Measurements Following the 22 February 2011 Christchurch Earthquake
Abstract
The M7.1 Darfield (Canterbury) earthquake of 4 September 2010 marked the start of a protracted sequence of earthquakes in the vicinity of Christchurch, NewZealand, including the damaging M6.2 event of 22 February 2011. The short-term postseismic deformation that occurred between these two events has been studied previously using GPS and InSAR methods (Beavan et al., 2013; Motagh et al. 2013). Using the Small Baseline Subset (SBAS) method, we generate an InSAR time-series to investigate subsequent postseismic ground deformation in the Christchurch region. We estimate the deformation signals on slowly decorrelating filtered phase (SDFP) pixels over the Christchurch region (Hooper et al., 2007). We have processed TerraSAR-X images spanning the time interval between March 2011 and June 2013. Two major aftershocks, in June and December 2011, and some smaller events, affect our ability to accurately detect and quantify the postseismic deformation signal resulting from the Christchurch earthquake. To overcome this, for each event we estimate and subtract the coseismic signal from interferograms spanning the corresponding aftershock using a simple least squares inversion.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2013
- Bibcode:
- 2013AGUFM.G31A0941F
- Keywords:
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- 1240 GEODESY AND GRAVITY Satellite geodesy: results