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Interpretation of 1D Vector Controlled-Source Audio-Magnetotelluric (CSAMT) Data Using Full Solution Modeling
Imran Hilman Mohammad1,2, Wahyu Srigutomo1, Doddy Sutarno1 & Prihadi Sumintadiredja3
1Earth Physics and Complex System Research Group, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung,
Jalan Ganesa No. 10, Bandung 40132, Indonesia
2Geophysics, Physics Department, Universitas Padjadjaran, Jalan Raya Bandung Sumedang KM 21, Jatinangor, Sumedang 45363 Indonesia
3Applied Geology Research Group, Faculty of Earth Sciences And Technology, Institut Teknologi Bandung, Jalan Ganesa No. 10, Bandung 40132, Indonesia
E-mail: imran.hilman@phys.unpad.ac.id
Abstract. In conventional controlled-source audio-magnetotelluric (CSAMT) prospecting, scalar CSAMT measurement is usually performed because of its simplicity and low operational cost. Since the structure of earth’s conductivity is complex, the scalar CSAMT method can lead to a less accurate interpretation. The complex conditions need more sophisticated measurements, such as vector or tensor CSAMT, to interpret the data. This paper presents 1D vector CSAMT interpretation. A full solution 1D CSAMT forward modeling has been developed and used to interpret both vector and scalar CSAMT data. Occam’s smoothness constrained inversion was used to test the vector and scalar CSAMT interpretations. The results indicate the importance of vector CSAMT to interpret CSAMT data in complex geological system.
Keywords: 1D Occam inversion; controlled-source audio-magnetotellurics; full solution 1D CSAMT forward modeling; scalar CSAMT; vector CSAMT interpretation.
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