干渉SARデータを用いた地震被害度推定モデル

抄録

This paper presents a damage estimation model of an earthquake using interferometric SAR data pairs. Coherence is defined as a correlation function of two single look complex (SLC) SAR data. The coherence derived from multi-temporal SLCs before and after the earthquake includes a temporal decorrelation in disturbed regions. To estimate the damage degree using the temporal decorrelation, the proposed model employs a coherence ratio which is the ratio of the coherence derived from SLCs before and after the event to the coherence derived from a pair of SLCs before the event. The temporal coherence ratio is computed by compensating the coherence ratio with the spacial decorrelation. Damage degrees are defined by logarithmic probability range of damaged area ratio. We indicate the significant relationship between the temporal coherence ratio and the probability of the damage degree. In the case of the Hyogoken-Nanbu Earthquake, its relationship can be represented by a linear function. Applying the least squares, we determine the parameters of regression lines and have succeeded in estimating the cumulative probability of the damage degree from the temporal coherence ratio.