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A Study of Impact Fracturing and Electric Resistivity Related to the Lockne Impact Structure, Sweden

  • Ann Bäckström
Part of the Impact Studies book series (IMPACTSTUD)

Abstract.

The fracture frequency and the electric resistivity of outcrops of crystalline basement rocks at the Lockne meteorite impact site have been studied in order to investigate the extent and radial changes of impact induced fracturing. By measuring the electric resistivity and the fracture frequency at the same outcrops, the effect of fracturing on the electric properties of the rock is estimated and correlated with the fracture frequency. A negative linear correlation between the Log of fracture frequency and the Log of electric resistivity was found.

It was also found that the fracture frequency decreases in a transition zone over a distance of about 1100 m across the southern margin of the impact structure. A similar set of measurements was made across the suggested northern limit of the structure, but no change was detected. This implies that the outer limit of the Tandsbyn Breccia is further to the north. The studied area is, therefore, not likely to be the margin of the structure.

Keywords

Electric Resistivity Rarefaction Wave Apparent Resistivity Crystalline Rock Impact Crater 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2005

Authors and Affiliations

  • Ann Bäckström
    • 1
  1. 1.Department of Land and Water Resources EngineeringRoyal Institute of TechnologyStockholmSweden

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