HR: 10:50h
AN: G42A-03    [Abstracts]
TI: Some Geologists' requirements for the developpment of insar and optical correlation and corresponding technical issues.
AU: * michel, r
EM: remi.michel@cea.fr
AF: remi michel, cea, Bruyeres, 91680 France
AB: Measuring earthquakes from optical images yields information about cartography of ruptured faults, horizontal co-seismic displacement near the faults and damages. Noise prevents analysis of low scale deformations (below the kilometric scale). SAR interferometry provides information about low spatial frequency of seismic deformations. Measurements close to the fault zone are generally unavailable due to temporal decorrelation and saturation. It does currently suffer from limitations due to atmospheric signal (from 1 fringe per km to 1 fringe per 10 km, derived from modeling), ionospheric artefacts (few fringes per 100 km at mid-latitude, derived from GPS) and temporal decorrelation. Those caracteristics yields current limitations for understanding mechanics of the seismic cycles as illustrated from few events ( Kunlun, Landers, Hector Mine, Aqaba, Chi-chi, Bam, Hector Mine and Izmit). development of atmospheric phase screen filters (from non-hydrostatic models or radiometers) are crucial at most places for the analysis of interseismic deformation. thigher Tighter constrains on the geometrical quality of images (resolution, relative location) would be of help in numerous context (high temporal decorrelation rate, analysis of relationship between dynamics and coseismic displacement, analysis of displacement at depth).Developping Sar polarimetry may apparently not bring decive information. Eventually, a groundbreaking imagery of seismic rupture and transient waves would requires near global radar imagery with a kilometric pixel size and a 10hz revisiting frequency.
DE: 1241 Satellite geodesy: technical issues (6994, 7969)
SC: Geodesy [G]
MN: Fall Meeting 2005