Basement depths of 3D basins, estimated from 1D magnetotelluric inversion

A. Ádám, A. Novák, L. Szarka

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Detailed magnetotelluric soundings along the Hungarian section of the CEL-7 seismic profile (SW Hungary, where a series of very deep 3D sedimentary basins is known from various geophysical-geological investigations) enabled us to produce magnetotellurics-based estimations for the topography of the high-resistivity basement. Both TM and TE modes were used for 1D inversion, and the resulting depth values were compared to the depths, taken from the "Pre-Tertiary Basement Contour Map of the Carpathian Basin" by Kilényi and Šefara (1989), called as K-S depths. The first conclusion is that the observed depth differences do not depend significantly on the sediment resistivity. At the same time, there is a significant difference between the magnetotelluric- and the K-S depths over the Balaton line (the most important tectonic (fracture) line crossing the MT profile). The TE mode-based inverted depth values are smaller, the TM mode-based depth values are larger than the K-S depth values. As the adjustment distance in case of the TE mode is, of course, larger than in case of the TM mode, the distortion in TE mode appears in a larger area. Apart from this distortion, the magnetotelluric depth values, especially the TM mode-based ones, are surprisingly very well approximate the K-S depth values. In case of the TM mode 76 percents of the differences are less than 600 m. (The average depth is nearly 4000 m). In case of the TE mode such a small deviation is obtained only in 52 percents of the total sounding sites, due to the significant TE effect of the Balaton line (a deep high-conductivity tectonic line).

Original languageEnglish
Pages (from-to)59-67
Number of pages9
JournalActa Geodaetica et Geophysica Hungarica
Volume42
Issue number1
DOIs
Publication statusPublished - Mar 2007

Fingerprint

Magnetotellurics
basements
inversions
Tectonics
basin
Topography
Sediments
sounding
electrical resistivity
tectonics
inversion
Hungary
contour map
profiles
sedimentary basin
topography
sediments

Keywords

  • 3D basins
  • Basement depth
  • Deep seismic profile
  • Tectonics

ASJC Scopus subject areas

  • Building and Construction
  • Geology

Cite this

Basement depths of 3D basins, estimated from 1D magnetotelluric inversion. / Ádám, A.; Novák, A.; Szarka, L.

In: Acta Geodaetica et Geophysica Hungarica, Vol. 42, No. 1, 03.2007, p. 59-67.

Research output: Contribution to journalArticle

@article{5e12649c50f444cabadf790052910043,
title = "Basement depths of 3D basins, estimated from 1D magnetotelluric inversion",
abstract = "Detailed magnetotelluric soundings along the Hungarian section of the CEL-7 seismic profile (SW Hungary, where a series of very deep 3D sedimentary basins is known from various geophysical-geological investigations) enabled us to produce magnetotellurics-based estimations for the topography of the high-resistivity basement. Both TM and TE modes were used for 1D inversion, and the resulting depth values were compared to the depths, taken from the {"}Pre-Tertiary Basement Contour Map of the Carpathian Basin{"} by Kil{\'e}nyi and Šefara (1989), called as K-S depths. The first conclusion is that the observed depth differences do not depend significantly on the sediment resistivity. At the same time, there is a significant difference between the magnetotelluric- and the K-S depths over the Balaton line (the most important tectonic (fracture) line crossing the MT profile). The TE mode-based inverted depth values are smaller, the TM mode-based depth values are larger than the K-S depth values. As the adjustment distance in case of the TE mode is, of course, larger than in case of the TM mode, the distortion in TE mode appears in a larger area. Apart from this distortion, the magnetotelluric depth values, especially the TM mode-based ones, are surprisingly very well approximate the K-S depth values. In case of the TM mode 76 percents of the differences are less than 600 m. (The average depth is nearly 4000 m). In case of the TE mode such a small deviation is obtained only in 52 percents of the total sounding sites, due to the significant TE effect of the Balaton line (a deep high-conductivity tectonic line).",
keywords = "3D basins, Basement depth, Deep seismic profile, Tectonics",
author = "A. {\'A}d{\'a}m and A. Nov{\'a}k and L. Szarka",
year = "2007",
month = "3",
doi = "10.1556/AGeod.42.2007.1.3",
language = "English",
volume = "42",
pages = "59--67",
journal = "Acta Geodaetica et Geophysica",
issn = "2213-5812",
publisher = "Springer Science + Business Media",
number = "1",

}

TY - JOUR

T1 - Basement depths of 3D basins, estimated from 1D magnetotelluric inversion

AU - Ádám, A.

AU - Novák, A.

AU - Szarka, L.

PY - 2007/3

Y1 - 2007/3

N2 - Detailed magnetotelluric soundings along the Hungarian section of the CEL-7 seismic profile (SW Hungary, where a series of very deep 3D sedimentary basins is known from various geophysical-geological investigations) enabled us to produce magnetotellurics-based estimations for the topography of the high-resistivity basement. Both TM and TE modes were used for 1D inversion, and the resulting depth values were compared to the depths, taken from the "Pre-Tertiary Basement Contour Map of the Carpathian Basin" by Kilényi and Šefara (1989), called as K-S depths. The first conclusion is that the observed depth differences do not depend significantly on the sediment resistivity. At the same time, there is a significant difference between the magnetotelluric- and the K-S depths over the Balaton line (the most important tectonic (fracture) line crossing the MT profile). The TE mode-based inverted depth values are smaller, the TM mode-based depth values are larger than the K-S depth values. As the adjustment distance in case of the TE mode is, of course, larger than in case of the TM mode, the distortion in TE mode appears in a larger area. Apart from this distortion, the magnetotelluric depth values, especially the TM mode-based ones, are surprisingly very well approximate the K-S depth values. In case of the TM mode 76 percents of the differences are less than 600 m. (The average depth is nearly 4000 m). In case of the TE mode such a small deviation is obtained only in 52 percents of the total sounding sites, due to the significant TE effect of the Balaton line (a deep high-conductivity tectonic line).

AB - Detailed magnetotelluric soundings along the Hungarian section of the CEL-7 seismic profile (SW Hungary, where a series of very deep 3D sedimentary basins is known from various geophysical-geological investigations) enabled us to produce magnetotellurics-based estimations for the topography of the high-resistivity basement. Both TM and TE modes were used for 1D inversion, and the resulting depth values were compared to the depths, taken from the "Pre-Tertiary Basement Contour Map of the Carpathian Basin" by Kilényi and Šefara (1989), called as K-S depths. The first conclusion is that the observed depth differences do not depend significantly on the sediment resistivity. At the same time, there is a significant difference between the magnetotelluric- and the K-S depths over the Balaton line (the most important tectonic (fracture) line crossing the MT profile). The TE mode-based inverted depth values are smaller, the TM mode-based depth values are larger than the K-S depth values. As the adjustment distance in case of the TE mode is, of course, larger than in case of the TM mode, the distortion in TE mode appears in a larger area. Apart from this distortion, the magnetotelluric depth values, especially the TM mode-based ones, are surprisingly very well approximate the K-S depth values. In case of the TM mode 76 percents of the differences are less than 600 m. (The average depth is nearly 4000 m). In case of the TE mode such a small deviation is obtained only in 52 percents of the total sounding sites, due to the significant TE effect of the Balaton line (a deep high-conductivity tectonic line).

KW - 3D basins

KW - Basement depth

KW - Deep seismic profile

KW - Tectonics

UR - http://www.scopus.com/inward/record.url?scp=33847172823&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33847172823&partnerID=8YFLogxK

U2 - 10.1556/AGeod.42.2007.1.3

DO - 10.1556/AGeod.42.2007.1.3

M3 - Article

AN - SCOPUS:33847172823

VL - 42

SP - 59

EP - 67

JO - Acta Geodaetica et Geophysica

JF - Acta Geodaetica et Geophysica

SN - 2213-5812

IS - 1

ER -