Development of procedures to analyse satellite images for early detection of widely-spread liquefaction occurence

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Analysis was made on a set of high resolution satellite images (GeoEye1) taken before and after the 2011 off the Pacific Coast of Tohoku earthquake. By using information on the sites where liquefaction-induced sand boiling has been observed as training data, location of the sites with similar conditions were identified from the satellite image taken after the earthquake. The results were verified through on-site investigation. In addition, by simulating sand boiling under drying process that is exposed to air, a laboratory test was conducted to reveal the possible change of its image conditions with time. Further analysis was also made on a set of satellite images (RapidEye) that were taken more frequently than the above, it was demonstrated that regions with possible sand boiling over several prefectures could be extracted in rather a short period.