Тhe task of searching for kimberlite pipes in covered areas the Yakutia province is very difficult due to significant heterogeneity rocks overlying pipes. The strata terrigenous sediments contain trap complex (dolerite sills, tuff bodies). We consider results controlled source radiomagnetotelluric (CSRMT) soundings Yakutia/Siberia. Due great thickness (near 100 m) and relatively small horizontal sizes (80–200 m), they cannot confidently be detected directly. An additional difficulty...

The classical radio-magnetotelluric (RMT) method is nowadays routinely applied to various environmental, engineering, and exploration problems. technique uses radio transmitters broadcasting in the frequency range of 10 kHz 1 MHz, measurements are carried out far field. well-known disadvantages RMT a lack robust remote areas; absence below kHz, which limits penetration depth; possible low signal-to-noise ratio. To overcome these difficulties, controlled sources can be used (controlled-source...

When studying horizontally-inhomogeneous media, it is necessary to apply tensor modifications of electromagnetic soundings. Use measurements particular relevance in near-surface electrical prospecting because the upper part geological section usually more heterogeneous than deep strata. In Enviro-MT system designed for controlled-source radiomagnetotelluric (CSRMT) sounding method, two mutually perpendicular horizontal magnetic dipoles (two vertical loops) are used measurements. We propose a...

In this paper, we discuss several approaches for a joint inversion of controlled source radiomagnetotelluric (CSRMT) and electrical resistivity tomography (ERT) data observed over anisotropic media. We compare results 2D isotropic with newly developed 1D algorithm. The algorithm involves the full high frequency forward formulations without plane wave assumption. demonstrate that measurements on an subsurface cannot fit both datasets properly due to anisotropy shallow horizons quaternary...

This paper presents a novel numerical method for simulation controlled-source audio-magnetotellurics (CSAMT) and radio-magnetotellurics (CSRMT) data. These methods are widely used in mineral exploration. Interpretation of the CSAMT CSRMT data collected over an area with complex geology requires application effective modeling capable to represent geoelectrical model deposit well. In this paper, we considered approach 3D electromagnetic (EM) based on new types preconditioned iterative solvers...

The wave zone for a horizontal electric dipole (HED) as source in the controlled radiomagnetotelluric (CSRMT) method at use of high frequencies (hundreds kilohertz) is allocated. following features compare to quasi-static one are noted: slower EM field attenuation with distance, changes position favorable area CSRMT survey, directional diagram maximum radiation axial area, appearance polarization ellipticity components and delaying ellipses big semi-axes relatively linear case. Existing HED...

Prospects of application the radiomagnetotelluric (RMT) sounding method at solution environmental tasks are considered. Features foot, mobile and controlled source modifications RMT described. Results surveys using for investigations landfills industrial domestic wastes subsurface structure a gas station analyzed.

Features of a modification the controlled source audio-frequency magnetotellurics (CSAMT) sounding method with powerful and long-range action thousands kilometres are considered. Characteristics electromagnetic field cable as in this CSAMT analyzed waveguide zone at great distance from is allocated. Differences structure comparison usually allocated near-field, intermediate far-field zones. Technique data correction an experimental example its using described.

Horizontal welling is a common method for the laying of pipelines. This technology requires detailed exploration first 20-30 m subsurface searching optimal path tools and minimization damaging risks. Situations when pipeline trace crosses river are very common. In such case, it becomes necessary to explore geological cross-section just under in surrounding area. Usually this task being solved using following methods: seismic, vertical electrical soundings, resistivity tomography ground...

Abstract Summary Testing of the controlled source radio-magnetotellurics at study a granite-gneiss massif in India.

Summary Results of the individual isotropic 2D inversion CSRMT and ERT data their joint anisotropic 1D in study media are considered. According to data, thicknesses layers significantly larger than from borehole data. Resistivity section according is limited depth. The using a newly developed algorithm software ensures information about horizontal vertical resistivities coefficient anisotropy layers. Positions contacts different upper deep parts resistivity were successfully compared with...

Summary Prospects of application the controlled source radiomagnetotelluric (CSRMT) method with a horizontal electric dipole for contouring hydrogenic taliks in cryolithozone are considered. Mathematical modeling has been carried out model talik located under pond permafrost area measurement conditions far-field zone source. The accuracy was estimated using algorithm transition 1D and 2D inversions TE TM modes, bimodal inversion synthetic curves have performed. Based on results possibility...

Abstract Radiomagnetotellurics (RMT) is an electromagnetic method that uses signals from radio transmitters broadcasting in the 10 kHz to 1 MHz frequency range. Due its limited range, RMT commonly used as a shallow‐depth investigation tool. However, remote areas, there lack of and only very low (VLF) antennas (10–30 range) can be measured. This give rise signal‐to‐noise ratio. To overcome this disadvantage RMT, controlled‐source (CSRMT) applied measure low‐frequency (LF) mid‐frequency ranges...

In the controlled source radiomagnetotelluric (CSRMT) sounding method, a horizontal magnetic dipole, HMD (vertical loop) or electric and HED (grounded line) are used as sources. When working with HMD, is usually tuned to resonance increase current in loop. However, disadvantage of this approach narrow frequency range realized CSRMT method (1–12 kHz) short operating distance from (600–800 m). The need tune at each selected reduces efficiency survey. case using for sounding, measurements...