Abstract
The Pacific coast of the Tohoku earthquake that occurred on March 11, 2011 and its aftershocks caused liquefaction in the large area in the mouth of the Tone river. This study attempts to make clear the spatial relationship between buried-pipeline damage and sand-boiling for the liquefaction-induced damage concentration areas in the Kashima region. After specifying sand-boiling area from the aerial photographs, the database of water and sewer pipelines covered with liquefaction sand-boiling are developed in the Geographical Information System. As the result, the pipeline damage ratio in the sand-boiling area became 10 times as high as that in liquefaction-induced damage concentration area. The water-pipeline damage much occurs as the pipe length in the sand-boiling area increases. The location of pipeline damage moves from the center to boundary of sand-boiling according to the pipe length in the sand-boiling area.
