A new broadband radiomagnetotelluric instrument: applications to near surface investigations

Tezkan, B.; Saraev, A.

doi:10.3997/1873-0604.2008019

Cited by 36 publications

(9 citation statements)

References 12 publications

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“…We used three different radio‐magnetotelluric (RMT) systems, one from Uppsala University (EnviroMT; Bastani ; Bastani et al ) and two from the University of Cologne (RMT‐F and RMT‐CHYN; Tezkan and Saraev ). Additionally, a controlled‐source magnetotelluric (CSMT) system (Bastani et al ) was used to provide low‐frequency signals in order to increase the depth of penetration.…”

Section: Geophysical Surveysmentioning

confidence: 99%

“…To complement the EnviroMT data and to provide estimates of the lateral and vertical electrical conductivity distribution, we used two different instruments (RMT‐CHYN: Müller ,; Turberg et al ; Stiefelhagen ; and RMT‐F: Tezkan and Saraev ) to measure RMT impedances and tipper transfer functions. During the field survey, we collected RMT‐F data in a frequency range 10–325 kHz along lines 2–6 using a station spacing of 10 m. Here, we show the results (Fig.…”

Section: Geophysical Surveysmentioning

confidence: 99%

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Geophysical assessment and geotechnical investigation of quick‐clay landslides – a Swedish case study

Malehmir

Bastani

Krawczyk

et al. 2013

Near Surface Geophysics

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We present a preliminary assessment of the potential utility of various geophysical measurements carried out over a quick-clay landslide site in south-west Sweden. The multidisciplinary approach includes active P-and S-wave seismic investigations, including 2D and 3D reflection and refraction surveys, passive single and 3C seismic surveys, electrical resistivity tomography and electromagnetic surveys including controlled-source and radio-magnetotellurics, ground-penetrating radar and potential field studies. The P-wave and particularly S-wave reflection seismic data show a highresolution image of bedrock topography and the stratigraphy of a 100 m thick sequence of sediments that lies on top, which include lightly consolidated quick-clays. Of particular interest is the identification of a layer of relatively coarse-grained material between 10-20 m below the ground surface. Geotechnical investigations indicate that most but not all quick-clays at the site are located above this layer. Further studies are required to determine the importance of their relationship and whether the coarse-grained layer may have had a role in triggering quick-clay landslides in the region. Geoelectrical and electromagnetic methods provide high-resolution images of the unconsolidated subsurface and particularly the normal and leached clays. Radio-magnetotelluric methods proved valuable near the river where traditional geoelectrical methods failed to provide sufficient depth coverage. The study shows that geophysical data are able to image major subsurface structures associated with quick-clay landslides.

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Section: Geophysical Surveysmentioning

confidence: 99%

Section: Geophysical Surveysmentioning

confidence: 99%

Geophysical assessment and geotechnical investigation of quick‐clay landslides – a Swedish case study

Malehmir

Bastani

Krawczyk

et al. 2013

Near Surface Geophysics

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“…Радиоволновые (электромагнитные) методы геофизики широко применяются при решении геологических и геодинамических задач, таких как картирование и выделение зон тектонических нарушений (разломов), определение геоэлектрического разреза (ГЭР) толщи кристаллических и осадочных горных пород, а также ряда других [Zherebtsov, 2012;Melchinov et al, 2006;Efremov, 2013;Tezkan, Saraev, 2008]. Однако в пределах БРЗ целенаправленных исследований зон тектонических нарушений и их ГЭР радиоволновыми методами почти не проводились [Bashkuev, 1996;Melchinov et al, 2006].…”

Section: краткий обзор проблемыunclassified

Integration of the GPR and radio-impedance techniques in studies of the Baikal rift zone

Башкуев

Хаптанов

Дембелов

2019

Geodin. tektonofiz.

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Radio wave propagation techniques have been very rarely applied to investigate tectonic fault zones and geoelectric profiles of the Baikal rift zone. In our study, we used a combination of ground-penetrating radar (GPR) and radio impedance techniques in order to identify and investigate tectonic crustal fault zones in the study area. Using soundings in the super-long, long and ultra short radio wave ranges (from tens of KHz to few GHz), we detected the tectonic fault zones in the seismically active Baikal rift zone, specifically in the Tunka depression and the areas of Southern Baikal and Kotokel lakes. Faults and fault zones were identified from impedance variations and changes in the geoelectric profiles by analyzing the radio impedance profiles and soundings in the super-long and long radio wave ranges. The georadiolocation of fault structures in the ultra-short wave range made it possible to differentiate the patterns of tectonic disturbances up to individual seismic dislocations in sedimentary and crystalline rocks and to determine the kinematics of movements in the fault zones. The techniques used in this study complement each other and ensure obtaining adequate quantitative descriptions of the study objects. By integrating various techniques of radio wave diagnostics, it is possible to obtain more detailed information on the structures of the tectonic fault zones. The results obtained in this study and the radio impedance and GPR sounding and profiling techniques developed to investigate a heterogeneous underlying medium can be used in seismological and geological engineering surveys of the eastern and northern regions of Russia.

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“…Parameter of the survey design is listed in Table 1. It is a four channel instrument (Ex, Ey, Hx, Hy) with the capability of estimating the full impedance tensor [4]. The RMT profiles 4,5 and 6 are along 1100 m until 1700 m with direction N 0 o S, whereas the profiles 7 and 8 are located N90 o E, which are parallel to the direction of available radio transmitters.…”

Section: Rmt Measurements and Interpretationmentioning

confidence: 99%

RMT and TEM Measurements on an Active Fault in Northern Greece

Widodo¹,

Gurk²,

Tezkan³

2010

AIP Conference Proceedings

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To improve the seismic wave propagation model it is vital to know about site effects, e.g. the geotectonic properties of the area such as the top-of-basement, vertical tectonic boundaries (faults and basement fracturation) and the geothermal regime. Therefore, we carried out near surface EM (Electromagnetic) studies to understand the distribution of the active faulting and the top of basement structure of this particular area. The RMT (Radiomagnetotelluric) and TEM (Transient electromagnetic) measurements were carried out on eight profiles, 440 RMT and 104 TEM soundings were realized. The inverted RMT and TEM data show generally a four layer model. The layers are indicated as metamorphic and sediment rocks, which are in detail: marly silty sand with gravel (>> 100 Ωm), marly silty sand with clay (50 -100 Ωm), sandy clay (30 -50 Ωm) and silty sand (10 -30 Ωm) with varying thickness. Due to the high resistivity of the top layer, the skin depths of the RMT soundings are around 35 m. The TEM data gives detail information of the lower structure down to a depth of 200 m. According to our analysis, a normal fault next to the Euroseistest could be located having a strike direction of N 60 E. The joint interpretation of RMT and TEM data proves to be an effective tool to investigate complex geology structures.

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A new broadband radiomagnetotelluric instrument: applications to near surface investigations

Cited by 36 publications

References 12 publications

Geophysical assessment and geotechnical investigation of quick‐clay landslides – a Swedish case study

Geophysical assessment and geotechnical investigation of quick‐clay landslides – a Swedish case study

Integration of the GPR and radio-impedance techniques in studies of the Baikal rift zone

RMT and TEM Measurements on an Active Fault in Northern Greece

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