Journal
JOURNAL OF APPLIED GEOPHYSICS
Volume 135, Issue -, Pages 261-269Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jappgeo.2016.10.014
Keywords
Time-domain electromagnetic method; Magnetotellurics; Controlled source; Inversion; Mygdonian basin
Funding
- Academy of Finland [272912]
- EU FP6 Marie Curie Actions [MC-TOK/DEV-29627]
- Advanced Materials Doctoral Programme from University of Oulu Graduate School
- Academy of Finland (AKA) [272912, 272912] Funding Source: Academy of Finland (AKA)
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We present a novel approach where time-domain electromagnetic (TEM) data are transformed and subsequently used in two-dimensional (2-D) magnetotelluric inversion of the determinant of the impedance tensor. The main idea is to integrate TEM with magnetotelluric (MT) data to produce subsurface electrical resistivity models. Specifically, we show that 2-D MT data inversion of the determinant of the impedance tensor supported by inclusion of TEM-MT-transformed data has superior resolution at the near surface and at the same time static shift afflicting the MT data can be addressed. Thus, the approach allows for practical express integration of TEM data with MT measurements as opposed to a full combined 3-D inversion, which requires significant resources. The approach is successfully applied in the Mygdonian sedimentary basin located in Northern Greece. In addition to TEM and MT data, also controlled source - and radiomagnetotelluric data are available from the Mygdonian basin, which have been subjected to 2-D analysis previously. We have extended the analysis to a full 3-D inversion using ModEM code. All obtained models are analysed and are in a good agreement. (C) 2016 Elsevier B.V. All rights reserved.
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