Fig. 3

a Magnitude image before the disaster (21 February). b Magnitude image after the disaster (2 May). c Difference between a and b. d Google earth image. Smaller image shows position in epicenter and the target area. e Area with ∆γ _HH ≥ 0.2 is represented in red. f Area with ∆γ _{(HH, HV)} ≥ 0.2 and coherence filter is represented in red. Color legend for a–c: red and blue HH polarization, green HV polarization