Haiti Earthquake (12-Jan-2010) co-seismic motion using ALOS PALSAR

Transcription

1 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 Data used: Path Frame Products Date desc FBS desc FBS asc FBD asc FBS asc FBS Baselines and time intervals relative to one common reference scene Nr Pair Bperp dtime m 322days m 736days m 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

2 Figure 1 Haiti Earthquake 12-Jan-2010 co-seismic PALSAR differential interferogram One color cycle corresponds to 11.8cm line-of-sight displacement. 2

3 Figure 2 Height dependent atmospheric phase subtracted from Haiti Earthquake 12-Jan-2010 coseismic PALSAR differential interferogram shown in Figure 1. One color cycle corresponds to one phase cycle. 3

4 60cm 0cm -60cm LOS displ. Figure 3 Haiti Earthquake 12-Jan-2010 co-seismic displacement (LOS component) derived from PALSAR differential interferogram Positive line-of-sight values correspond to movement towards the satellite (uplift and/or movement to the East). 4

5 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 shown in Figure 1. One color cycle corresponds to one phase cycle. 5

6 Figure 5 Haiti Earthquake 12-Jan-2010 co-seismic PALSAR differential interferogram One color cycle corresponds to 11.8cm line-of-sight displacement. 6

7 Figure 6 Height dependent atmospheric phase subtracted from Haiti Earthquake 12-Jan-2010 coseismic PALSAR differential interferogram shown in Figure 5. One color cycle corresponds to one phase cycle. 7

8 60cm 0cm -60cm LOS displ. Figure 7 Haiti Earthquake 12-Jan-2010 co-seismic displacement (LOS component) derived from PALSAR differential interferogram Positive line-of-sight values correspond to movement towards the satellite (uplift and/or movement to the East). 8

9 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 shown in Figure 5. One color cycle corresponds to one phase cycle. 9

10 Figure 9 Haiti Earthquake 12-Jan-2010 co-seismic PALSAR differential interferogram One color cycle corresponds to 11.8cm line-of-sight displacement. 10

11 Figure 10 Height dependent atmospheric phase subtracted from Haiti Earthquake 12-Jan-2010 coseismic PALSAR differential interferogram shown in Figure 5. One color cycle corresponds to one phase cycle. 11

12 Estimation of co-seismic vertical and East-West components from ascending and descending PALSAR interferograms: Based on the descending orbit PALSAR pair and the ascending orbit pair 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

13 60cm 0cm -60cm vertical displacement Figure 11 Haiti Earthquake 12-Jan-2010 co-seismic displacement (vertical component) derived from PALSAR differential interferograms and values correspond to uplift. 13

14 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 and Positive values correspond to a displacement to the West. 14