Banks or levees are very important flood control structures and a failure may be catastrophic to surrounding communities. To avoid such disasters, so-called superlevees have recently been constructed in Japan and other countries. The width of a superlevee is about 30 times its height. Buildings and parks are often on the tops of superlevees because they are wide and strong enough to support such constructions (Figure 1).

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Monitoring the integrity of these structures by geophysical methods provides a noninvasive approach to identifying internal fractures and other weaknesses.

This article describes a 3D seismic survey of a superlevee along...

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