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| | Abstract | | The Authors have developed Hybrid Surface-Wave Survey Method which is combination of MASW (Multi-channel Analysis of Surface-waves) and LAMS (Linear Array Microtremor Survey) since 2014. This survey method has been applied to visualize shear-wave velocity sections both of levee bodys and of their foundations. However, the Authors have recognized that studying sub-strata at water-covered areas is also required to assess vulnerability of earth structures in/around rivers, lakes and the sea. Thus, the Authors conducted a preliminary study of Hybrid Surface-Wave Method in a river using both Ocean Bottom Cables (OBC) and Ocean Bottom Recorders (OBR) to collect practical data and to evaluate performance of the survey method. As a result of the study, it was verified that MASW can be performed at the under-water. It was also revealed that LAMS conducted with both OBC and OBR can be applicable at water-covered areas as well. Consequently, Hybrid Surface Wave Method can be performed at water-covered areas. We call this survey technique the Under-Water Hybrid Surface-Wave Survey Method (UWHSW). |
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