Marine ert modeling for the detection of fracture zones

Georgios Tassis, Panagiotis Tsourlos, Jan Steinar Ronning, Torleif Dahlin

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceedingpeer-review

1 Citation (SciVal)

Abstract

Resistivity measurements in marine environments have already been tested in Norwegian landscapes in in the detection of subsea fracture zones (Lile et al. 1994; Dalsegg, 2012). Yet, most of the produced data have been processed without taking into account the special conditions created by the presence of seawater. Similar studies outside of Norway (Tsourlos et al., 2001; Satriani et al., 2011; Rucker & Noonan, 2013; Dahlin et al., 2014) have also utilized ERT in marine conditions however, most of these studies had deal with brackish water which is less conductive than pure seawater and therefore more favorable to the method (figure 1). This study summarizes our efforts to establish basic rules when considering whether or not pure sea water ERT can satisfactorily detect weak zones inside resistive bedrock. It is also in close connection to related ERT measuring (Rønning et al., 2009; Ganerod et al., 2006; Dalsegg, 2012) and modeling work (Reiser et al., 2007) carried out at the Geological Survey of Norway (NGU) and funded by the Norwegian Public Roads Administration. All results presented here are part of published NGU reports which were made to supplement the construction of an underwater tunnel in western Norway. Based on the modeling results, we were able to improve interpretations of ERT measurements made across seawater straits at Kvitsoy island but also conduct new marine ERT measurements in a more sophisticated manner. Nevertheless, we were also able to detect further limitations to the method.

Original languageEnglish
Title of host publication28th Symposium on the Application of Geophysics to Engineering and Environmental Problems 2015, SAGEEP 2015
PublisherEnvironmental and Engineering Geophysical Society (EEGS)
Pages345-349
Number of pages5
ISBN (Electronic)9781510802483
Publication statusPublished - 2015 Jan 1
Event28th Symposium on the Application of Geophysics to Engineering and Environmental Problems 2015, SAGEEP 2015 - Austin, United States
Duration: 2015 Mar 222015 Mar 26

Conference

Conference28th Symposium on the Application of Geophysics to Engineering and Environmental Problems 2015, SAGEEP 2015
Country/TerritoryUnited States
CityAustin
Period2015/03/222015/03/26

Subject classification (UKÄ)

  • Geotechnical Engineering

Keywords

  • Seawater
  • Tunnels
  • Fracture
  • Geophysics
  • Public administration
  • Resistivity measurement
  • Underwater tunnel
  • Brackish water
  • Fracture zone
  • Marine conditions
  • Marine environment
  • Model results
  • Public roads
  • Aluminum

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