Details of the Abstract
| Title of paper | Development history of novel MT equipment using MI sensor |
| List of authors | H. Mizunaga, T. Tanaka, K. Hashimoto, K. Hirase |
| Affiliation(s) | Kyushu University, Kyushu University, Kyushu University, JOGMEC |
| Summary | The magnetotelluric (MT) method is an electromagnetic exploration method that uses natural electromagnetic field variations to estimate the resistivity structure of the subsurface based on the ratio of the electric and magnetic fields. The MT method is used for geothermal exploration, mineral resource exploration, and petroleum exploration. Furthermore, the MT method's ability to probe deep subsurface has been utilized in geophysical studies of the crust and mantle. The Exploration Geophysics Laboratory of Kyushu University has been developing an electromagnetic measurement system for more than a decade for subsurface resource exploration and monitoring subsurface fluids. The results of this research have been recognized by the Japan Organization for Metals and Energy Security (JOGMEC), which has contracted us to conduct a two-and-a-half-year research project entitled "High-efficiency High-density Exploration Technology - Advanced MT Exploration Technique Using Small and Lightweight Equipment" under the contract with JOGMEC since FY2021. The main objective of this project is to "develop a compact and lightweight MT measurement system," as the research title indicates, but the project also includes many related studies. A feature of the new MT system, which differs significantly from conventional MT equipment, is that it uses magneto-impedance (MI) sensors instead of induction coils. MI sensor is a new compact sensor based on the magneto-impedance effect, which has excellent magnetic sensitivity, especially at low frequencies. Another major feature is using the SoC-type IC in the control circuit to reduce power consumption. Low power consumption enables continuous observation for 1-2 weeks, which was impossible with previous instruments. This paper provides an overview and history of the novel MT project. |
| Session Keyword | 1.0 Instrumentation, data acquisition and processing |
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