2009
DOI: 10.1029/2008gl036907
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Locations and types of ruptures involved in the 2008 Sichuan earthquake inferred from SAR image matching

Abstract: We have detected detailed ground displacements in the proximity of the Longmen Shan fault zone (LMSFZ) by applying a SAR offset-tracking method in the analysis of the 2008 Sichuan earthquake. An elevation-dependent correction is indispensable for achieving sub-meter accuracy. A sharp displacement discontinuity with a relative motion of ~1-2 m appears over a length of 200 km along the LMSFZ, which demonstrates that the main rupture has proceeded on the Beichuan fault (BF) among several active faults composing t… Show more

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Cited by 43 publications
(70 citation statements)
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References 14 publications
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“…Because the InSAR data were missing near the faults due to the problem in phase unwrapping, we applied offset tracking technique to ALOS-2/PALSAR-2 data so that we could detect robust signals even if the displacement gradient was high (Tobita et al 2001;Kobayashi et al 2009;Takada et al 2009). We set the window size of 32 × 64 pixels for range and azimuth with the sampling interval of 12 × 24 pixels for range and azimuth, respectively.…”
Section: Methods and Resultsmentioning
confidence: 99%
“…Because the InSAR data were missing near the faults due to the problem in phase unwrapping, we applied offset tracking technique to ALOS-2/PALSAR-2 data so that we could detect robust signals even if the displacement gradient was high (Tobita et al 2001;Kobayashi et al 2009;Takada et al 2009). We set the window size of 32 × 64 pixels for range and azimuth with the sampling interval of 12 × 24 pixels for range and azimuth, respectively.…”
Section: Methods and Resultsmentioning
confidence: 99%
“…Our model was able to reproduce well the observations (Figures 4 and 5). The root mean square of the residuals in range offset was estimated to be 19.1 cm, which is comparable to or less than the typical measurement accuracy of pixel-offset analysis [13]. Thus, our uniform slip model sufficiently accounts for the nature of the source.…”
Section: Fault Modelingmentioning
confidence: 74%
“…We employed a nearly square search patch of 256 × 256 pixels (range × azimuth:~680 m ×~640 m). We then reduced the artifact by applying an elevation-dependent correction incorporating NASA Shuttle Radar Topography Mission (SRTM) digital elevation model (DEM) data with a 3-arcsec resolution [16] in the same manner as used by Kobayashi et al [13]. The measured offset consisted of two components: (1) displacement along the line of sight (range offset) and (2) horizontal movement along the ground parallel to the satellite track (azimuth offset).…”
Section: Methodsmentioning
confidence: 99%
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“…In this context, to derive further information on crustal deformation, I applied multiple-aperture interferometry, generally known as MAI (Scheiber and Moreira 2000;Bechor and Zebker 2006), where the basic method of Barbot et al (2008) was followed. Although the azimuth component can be measured also by a pixel offset method (Michel et al 1999;Kobayashi et al 2009), the measurement accuracy, in general, is worse than that of MAI. This is why I here applied the MAI method.…”
Section: Sar Data and Analysis Methodsmentioning
confidence: 99%