Key results on deep electrical conductivity anomalies in the Pannonian Basin (PB), and their geodynamic aspects

A. Ádám, L. Szarka, A. Novák, V. Wesztergom

Research output: Article

3 Citations (Scopus)

Abstract

In the first part of the paper a brief introduction is given (a) to the magnetotelluric (MT) and magnetovariation (MV) soundings, (b) to electrical resistivity of minerals and rocks, and their dependence on temperature and fluid content. The basic geoelectric model in the Pannonian Basin is a (linear) tectonic zone (“dike”) and a series of dikes. In the second part the main crustal and mantle conductivity anomalies observed in the Pannonian Basin (PB) are summarized: (a) deep conductive crustal fractures and their relation to the occurrence of the earthquakes, boundary of the megablock(s) etc., (b) middle crustal conductors as indicators of decrease in stress and seismic activity depending on thermal regime, (c) the conductive asthenosphere and its lateral change in the PB in connection with the heat flow and tectonics. The general relation between the depth of the conductive asthenosphere and the regional heat flow is also presented, (d) MT anisotropy of the resistivity distribution in the PB and its tectonic explanation based on Haas’s tectonic map (2001, Fig. 1). All these observations and conclusions are considered as results for further investigations.

Original languageEnglish
Pages (from-to)205-228
Number of pages24
JournalActa Geodaetica et Geophysica
Volume52
Issue number2
DOIs
Publication statusPublished - jún. 1 2017

Fingerprint

Geodynamics
geodynamics
Tectonics
electrical conductivity
tectonics
Magnetotellurics
anomalies
anomaly
Levees
electrical resistivity
asthenosphere
rock intrusions
basin
heat transmission
heat flow
crustal fractures
dike
Heat transfer
thermal regime
sounding

ASJC Scopus subject areas

  • Building and Construction
  • Geophysics
  • Geology

Cite this

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abstract = "In the first part of the paper a brief introduction is given (a) to the magnetotelluric (MT) and magnetovariation (MV) soundings, (b) to electrical resistivity of minerals and rocks, and their dependence on temperature and fluid content. The basic geoelectric model in the Pannonian Basin is a (linear) tectonic zone (“dike”) and a series of dikes. In the second part the main crustal and mantle conductivity anomalies observed in the Pannonian Basin (PB) are summarized: (a) deep conductive crustal fractures and their relation to the occurrence of the earthquakes, boundary of the megablock(s) etc., (b) middle crustal conductors as indicators of decrease in stress and seismic activity depending on thermal regime, (c) the conductive asthenosphere and its lateral change in the PB in connection with the heat flow and tectonics. The general relation between the depth of the conductive asthenosphere and the regional heat flow is also presented, (d) MT anisotropy of the resistivity distribution in the PB and its tectonic explanation based on Haas’s tectonic map (2001, Fig. 1). All these observations and conclusions are considered as results for further investigations.",
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AU - Szarka, L.

AU - Novák, A.

AU - Wesztergom, V.

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