A degree estimation model of earthquake damage using temporal coherence ratio

A degree of earthquake damage can be estimated using temporal decorrelation by employing a coherence ratio which is defined by dividing a post-event coherence image by a pre-event image. In the case of applying both C and L bands SAR data for evaluating the damage of the 1995 Hyogoken-Nanbu Earthquake in Japan, the probability of the degree of damage could be approximated by a linear function of the coherence ratio. In this paper, we examine whether the post-earthquake damage estimation model is applicable for the 1999 Kocaeli earthquake in Turkey as another case. As a result, significant correlation between the probability of the degree of damage and the grade of damage surveyed by disaster researchers is also clarified by employing the coherence ratio computed from three ERS- 1/2 SAR data set including the event.