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Co-seismic line-of-sight displacements of the 2011 Mw9.0 Japan earthquake derived from InSAR data of Envisat ASAR,ALOS PALSAR and TerraSAR-X show a maximum value of about - 245cm to -221cm near the epicenter.This result is in good agreement with the result of GPS measurement.The observed displacement pattern suggests an earthquake-rupture zone over 500kn long,with a ground-motion pattern in the vicinity of the northern segment more complex than that of the southern segment,possibly due to immediate aftershocks that occurred between satellite passes.