Haiti Earthquake (12-Jan-2010) co-seismic motion using ALOS PALSAR Urs Wegmüller, Charles Werner, Maurizio Santoro Gamma Remote Sensing, CH-3073 Gümligen, Switzerland SAR data: JAXA, METI; PALSAR AO Project 094 and ESA CAT-1 Project C1F.6549 Data Processing Gamma Remote Sensing AG Copyright Gamma Remote Sensing AG This work was supported by the EC FP7 Project SAFER Contact: Gamma Remote Sensing AG Urs Wegmuller Worbstrasse 225 CH-3073 Gümligen, Switzerland wegmuller@gamma-rs.ch Data used: Path Frame Products Date desc 447 3240-3250 FBS 20090309 desc 447 3240-3250 FBS 20100125 asc 137 350-360 FBD 20070924 asc 137 350-360 FBS 20080209 asc 137 350-360 FBS 20100214 Baselines and time intervals relative to one common reference scene Nr Pair Bperp dtime 1 20090309 20100125 789m 322days 2 20080209 20100214 446m 736days 3 20070924 20100214-420m 874days The two tracks significantly overlap. For each pairs differential interferometric processing was done to derive (1) a differential interferogram, (2) unwrapped deformation phases and (3) line of sight displacements. The following processing steps were used: - raw data processing with range extension using GAMMA MSP - co-registration of SLCs to common geometry - differential interferometry using - oversampled SRTM as initial height reference - slope adaptive common band filtering - baseline refinement - estimation and subtraction of a topography related atmospheric phase term - phase unwrapping The results were geocoded to geographic coordinates. 1
Figure 1 Haiti Earthquake 12-Jan-2010 co-seismic PALSAR differential interferogram 20090309 20100125. One color cycle corresponds to 11.8cm line-of-sight displacement. 2
Figure 2 Height dependent atmospheric phase subtracted from Haiti Earthquake 12-Jan-2010 coseismic PALSAR differential interferogram 20090309 20100125 shown in Figure 1. One color cycle corresponds to one phase cycle. 3
60cm 0cm -60cm LOS displ. Figure 3 Haiti Earthquake 12-Jan-2010 co-seismic displacement (LOS component) derived from PALSAR differential interferogram 20090309 20100125. Positive line-of-sight values correspond to movement towards the satellite (uplift and/or movement to the East). 4
Figure 4 Residual phase obtained by subtraction of the filtered unwrapped displacement phase from the Haiti Earthquake 12-Jan-2010 co-seismic PALSAR differential interferogram 20090309 20100125 shown in Figure 1. One color cycle corresponds to one phase cycle. 5
Figure 5 Haiti Earthquake 12-Jan-2010 co-seismic PALSAR differential interferogram 20080209 20100214. One color cycle corresponds to 11.8cm line-of-sight displacement. 6
Figure 6 Height dependent atmospheric phase subtracted from Haiti Earthquake 12-Jan-2010 coseismic PALSAR differential interferogram 20080209 20100214 shown in Figure 5. One color cycle corresponds to one phase cycle. 7
60cm 0cm -60cm LOS displ. Figure 7 Haiti Earthquake 12-Jan-2010 co-seismic displacement (LOS component) derived from PALSAR differential interferogram 20080209 20100214. Positive line-of-sight values correspond to movement towards the satellite (uplift and/or movement to the East). 8
Figure 8 Residual phase obtained by subtraction of the filtered unwrapped displacement phase from the Haiti Earthquake 12-Jan-2010 co-seismic PALSAR differential interferogram 20080209 20100214 shown in Figure 5. One color cycle corresponds to one phase cycle. 9
Figure 9 Haiti Earthquake 12-Jan-2010 co-seismic PALSAR differential interferogram 20070924 20100214. One color cycle corresponds to 11.8cm line-of-sight displacement. 10
Figure 10 Height dependent atmospheric phase subtracted from Haiti Earthquake 12-Jan-2010 coseismic PALSAR differential interferogram 20070924 20100214 shown in Figure 5. One color cycle corresponds to one phase cycle. 11
Estimation of co-seismic vertical and East-West components from ascending and descending PALSAR interferograms: Based on the descending orbit PALSAR pair 1 20090309-20100125 and the ascending orbit pair 20080209 20100214 the co-seismic vertical and East-West components were estimated. Considering the relatively high phase noise and the high phase gradients the result has to be considered with caution. The residual phases shown in Figures 4 and 8 show that some displacement phase may have been lost in the unwrapping. 12
60cm 0cm -60cm vertical displacement Figure 11 Haiti Earthquake 12-Jan-2010 co-seismic displacement (vertical component) derived from PALSAR differential interferograms 20090309 20100125 and 20080209 20100214. values correspond to uplift. 13
60cm 0cm -60cm East to West displacement Figure 12 Haiti Earthquake 12-Jan-2010 co-seismic displacement (East to - West component) derived from PALSAR differential interferograms 20090309 20100125 and 20080209 20100214. Positive values correspond to a displacement to the West. 14