| 講演要旨(和文) | | 地下浅部の比抵抗異常を検出することを目的として,AMラジオ放送波の水平と鉛直成分を受信し,両者の位相差を検出,表示する装置を製作した.この装置を用いて,佐賀県牛津川の堤防上で探査を実施した.その結果,大きな位相差が2測点で検出された.この位相値は,小規模電気探査結果に基づいた比抵抗構造で説明可能である.深度0.5mの低比抵抗層がこの位相差の直接の原因であるが,46°という大きな値は,堤防下部(深度約5m)の低比抵抗層を考慮しないと説明できない. |
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| | 講演要旨(英文) | | The survey system using the phase difference between the horizontal and vertical magnetic components of AM radio waves is applied for detecting the conductivity anomaly area on banks. The survey was conducted on the bank of Ushizu River on Saga Prefecture at 18 sites along a line of 750m long. The large phase difference observed at the site of 5 is well explained by the 2D conductivity model based on the result of the DC survey, in which a high conductivity layer possibly of ground water is underlain by the shallow conductive layer at the depth of 0.5 m. |
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