lyons and sandwell, jgr, 2003 landers eq hector mine eq
TRANSCRIPT
Lyons and Sandwell, JGR, 2003
Landers
EQ
Hector Mine
EQ
http://topex.ucsd.edu/gmtsar
forming interferogram
phase due to curved earth
phase due to topography
Perpendicular baseline
MATTERS!
total phase
Phase from curved Earth
total phase
Critical Baseline
Phase from topography
phase minus spherical earth
How high is Toro Peak?
deformation and topography
Triggered slip on Southern San AndreasFault
Need for Precise Orbits1. proper focus
2. transform from geographic radar coordinates
3. image alignment
4. flattening interferogram
Brute force algorithm given precise orbit subroutine pick target point
fly satellite along orbit and identify point of
closest approach(This is inefficient but computers are fast so don’t waste time
coding.)
GMTSAR
2-pass processingno ground controlseamless abutment of frames along track
stacking for time seriesone master and many slavesprimary, secondary, tertiary, image alignment
ScanSAR Interferometrypossible but not easycode needs refinement