Geological structure of beachrock using electrical resistivity and surface wave surveys<br/>—Application to the coastal area of Yagaji Island in Nago-shi, Okinawa, Japan—

Suzuki Koichi, Kawasaki Satoru, Kubo Ryosuke, Yamaguchi Shinji, Hata Toshiro

doi:10.3124/segj.66.277

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電気探査・表面波探査によるビーチロックの地下構造<br/>─沖縄県名護市屋我地島沿岸地点での適用例─
電気探査・表面波探査によるビーチロックの地下構造 : 沖縄県名護市屋我地島沿岸地点での適用例
デンキタンサ・ヒョウメンハタンサニヨルビーチロックノチカコウゾウ : オキナワケンナゴシヤガチトウエンガンチテンデノテキヨウレイ
Geological structure of beachrock using electrical resistivity and surface wave surveys<br/>—Application to the coastal area of Yagaji Island in Nago-shi, Okinawa, Japan—

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Abstract

Previous studies of artificial bedrock with self-repair ability in coastal area have indicated the important of building coastal levees at low cost with minimal environment load. The goal is to form the extreme artificial bedrock using natural materials (e.g., microbes, sand, shell, pieces of coral, and seaweed etc.) in a short time that can tolerate climate conditions. Most studies have focused on beachrocks in tropical and subtropical coral reef coastal areas, but little research has been done on the subsurface structure. Therefore, we performed both a DC electrical survey and a surface wave survey along the same lines to elucidate the subsurface structure of beachrocks in the coastal area of Okinawa Prefecture, Japan. In addition, we measured the physical properties of the beachrock sample collected from the survey lines by laboratory tests. As the results, both the resistivity and the shear wave velocity of the beachrock were higher than those of the underlying unconsolidated sand layer. Furthermore, the beachrock is up to approximately 1 m thick, increasing toward the coastline.<br>

Journal

BUTSURI-TANSA(Geophysical Exploration)

BUTSURI-TANSA(Geophysical Exploration) 66 (4), 277-285, 2013

The Society of Exploration Geophysicists of Japan

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