ELECTROMAGNETIC SURVEYING METHOD

PROBLEM TO BE SOLVED: To provide an electromagnetic surveying method capable of measuring a magnetic field in a pit where a pit wall is covered by a metal pipe.SOLUTION: An electromagnetic surveying method for using a transmission source 10 which generates a primary magnetic field and a magnetic field detecting device 20 which detects a secondary magnetic field based on the primary magnetic field generated by the transmission source 10 includes the steps of: arranging the magnetic field detecting device 20 inside a pit 2000 where a pit wall is covered by a metal pipe 2001, the magnetic field detecting device 20 including a superconducting quantum interference device; and detecting the secondary magnetic field by the magnetic field detecting device 20. 【課題】金属管によって坑壁が覆われた坑井内で測定を行える電磁探査方法を提供すること。【解決手段】電磁探査方法は、１次磁場を発生させる送信源１０と、送信源１０が発生させた１次磁場に基づく２次磁場を検出する磁場検出装置２０と、を用いる電磁探査方法であって、磁場検出装置２０は、超電導量子干渉素子を含み、金属管２００１によって坑壁が覆われた坑井２０００の内部に磁場検出装置２０を配置する配置工程と、２次磁場を磁場検出装置２０で検出する検出工程と、を含む。【選択図】図１