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Subject: Interferometric map of the Hector Mine earthquake
From: Larry Cochrane cochrane@..............
Date: Thu, 25 Nov 1999 18:44:41 -0800


Interesting site at:

http://www.jpl.nasa.gov/hectormine/

Text from the page:

The image is an interferometric map of the Hector Mine earthquake area
showing the ground displacement along the radar line of sight. One full
color cycle represents 10 cm of range displacement. Gray areas are zones of
low phase coherence that have been masked before unwrapping. Dotted lines
depict California faults, after Jennings (1975), and thick, solid lines the
Landers , 1992 surface rupture, after Sieh et al. (1993). Thin, solid lines
within zone of dense fringes are surface breaks inferred from azimuth and
range disparities (offsets) between before and after images, and phase
discontinuities. 
 
   The topographic phase has been removed using a combination of the USGS
30 m and 90 m digital elevation maps. The rapid orbits from the ESA D-PAF
were used to determine the interferometric baseline and to flatten the map.
A small phase ramp was removed manually to minimize the far field
displacement. Processing from RAW data to interferogram and geocoded map
was done using the JPL/Caltech ROI_PAC software package.  
   The radar data were acquired by the European Space Agency ERS-2
satellite on September 15 and October 20, 1999. The data used here cover
frames 2907 and 2925 of descending track 127. The post-earthquake data were
purchased from Eurimage and transfered from the Centre Canadien de
Teledetection to JPL via FTP.  
  
-Larry


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Larry Cochrane <cochrane@..............>