Landslides in Beichuan county seat extracted from ALOS PALSAR intensity images, as shown in the inner region of the red circle: (a) pre-earthquake backscattering
intensity image of PALSAR acquired on February 17, 2008; (b) post-earthquake backscattering intensity image of PALSAR acquired on May 19, 2008; (c) differential
backscattering intensity image of PALSAR between pre- and post-earthquake; and (d) false color composition image of pre- and post-earthquake backscattering intensity
image of PALSAR, R, B = pre-earthquake backscattering intensity image of PALSAR acquired on February 17, 2008, G = post-earthquake backscattering intensity image of
PALSAR acquired on May 19, 2008.