Combined three-dimensional electric and seismic tomography study on the Åknes rockslide in western Norway

Heincke, Björn; Günther, Thomas; Dalsegg, Einar; Rønning, Jan Steinar; Ganerød, Guri V.; Elvebakk, Harald

doi:10.1016/j.jappgeo.2009.12.004

Cited by 60 publications

(32 citation statements)

References 20 publications

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“…Earlier ground resistivity measurements in the area, strengthen this hypothesis. Note that these geological conditions are in strong contrast to other Norwegian rock slides, like Åknes which is situated in gneiss with resistivities of several 1,000 to 10,000 Ωm even in the water saturated zones (Heincke et al 2010).…”

Section: Abstract: Aem Ert Geohazards 3dmentioning

confidence: 66%

Correlating ERT with AEM in a rock slide mapping project, same shape but different quantities

Pfaffhuber¹,

Bazin²,

Lato

et al. 2013

ASEG Extended Abstracts

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Section: Abstract: Aem Ert Geohazards 3dmentioning

confidence: 66%

Correlating ERT with AEM in a rock slide mapping project, same shape but different quantities

Pfaffhuber¹,

Bazin²,

Lato

et al. 2013

ASEG Extended Abstracts

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“…The geological setting of the area, especially as regards gneisses lithologies, is characterized by intense foliation, which strongly contributes to determine slope instability; the main cracks are indeed developed along foliation plans [48].…”

Section: Geological and Geomorphological Settingmentioning

confidence: 99%

Space-Borne and Ground-Based InSAR Data Integration: The Åknes Test Site

et al. 2016

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This work concerns a proposal of the integration of InSAR (Interferometric Synthetic Aperture Radar) data acquired by ground-based (GB) and satellite platforms. The selected test site is the Åknes rockslide, which affects the western Norwegian coast. The availability of GB-InSAR and satellite InSAR data and the accessibility of a wide literature make the landslide suitable for testing the proposed procedure. The first step consists of the organization of a geodatabase, performed in the GIS environment, containing all of the available data. The second step concerns the analysis of satellite and GB-InSAR data, separately. Two datasets, acquired by RADARSAT-2 (related to a period between October 2008 and August 2013) and by a combination of TerraSAR-X and TanDEM-X (acquired between July 2010 and October 2012), both of them in ascending orbit, processed applying SBAS (Small BAseline Subset) method, are available. GB-InSAR data related to five different campaigns of measurements, referred to the summer seasons of 2006, 2008, 2009, 2010 and 2012, are available, as well. The third step relies on data integration, performed firstly from a qualitative point of view and later from a semi-quantitative point of view. The results of the proposed procedure have been validated by comparing them to GPS (Global Positioning System) data. The proposed procedure allowed us to better define landslide sectors in terms of different ranges of displacements. From a qualitative point of view, stable and unstable areas have been distinguished. In the sector concerning movement, two different sectors have been defined thanks to the results of the semi-quantitative integration step: the first sector, concerning displacement values higher than 10 mm, and the 2nd sector, where the displacements did not exceed a 10-mm value of displacement in the analyzed period.

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“…Another multidisciplinary geophysical approach for mapping a fault zone is given by Malehmir et al (2016). Heincke et al (2010) used seismic and electric tomography to assess the rock quality on a hard rock slope in Norway.…”

Section: Introductionmentioning

confidence: 99%

Electric resistivity and seismic refraction tomography: a challenging joint underwater survey at Äspö Hard Rock Laboratory

et al. 2017

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Abstract. Tunnelling below water passages is a challenging task in terms of planning, pre-investigation and construction. Fracture zones in the underlying bedrock lead to low rock quality and thus reduced stability. For natural reasons, they tend to be more frequent at water passages. Ground investigations that provide information on the subsurface are necessary prior to the construction phase, but these can be logistically difficult. Geophysics can help close the gaps between local point information by producing subsurface images. An approach that combines seismic refraction tomography and electrical resistivity tomography has been tested at the Äspö Hard Rock Laboratory (HRL). The aim was to detect fracture zones in a well-known but logistically challenging area from a measuring perspective.The presented surveys cover a water passage along part of a tunnel that connects surface facilities with an underground test laboratory. The tunnel is approximately 100 m below and 20 m east of the survey line and gives evidence for one major and several minor fracture zones. The geological and general test site conditions, e.g. with strong power line noise from the nearby nuclear power plant, are challenging for geophysical measurements. Co-located positions for seismic and ERT sensors and source positions are used on the 450 m underwater section of the 700 m profile. Because of a large transition zone that appeared in the ERT result and the missing coverage of the seismic data, fracture zones at the southern and northern parts of the underwater passage cannot be detected by separated inversion. Synthetic studies show that significant three-dimensional (3-D) artefacts occur in the ERT model that even exceed the positioning errors of underwater electrodes. The model coverage is closely connected to the resolution and can be used to display the model uncertainty by introducing thresholds to fade-out regions of medium and low resolution. A structural coupling cooperative inversion approach is able to image the northern fracture zone successfully. In addition, previously unknown sedimentary deposits with a significantly large thickness are detected in the otherwise unusually well-documented geological environment. The results significantly improve the imaging of some geologic features, which would have been undetected or misinterpreted otherwise, and combines the images by means of cluster analysis into a conceptual subsurface model.

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Combined three-dimensional electric and seismic tomography study on the Åknes rockslide in western Norway

Cited by 60 publications

References 20 publications

Correlating ERT with AEM in a rock slide mapping project, same shape but different quantities

Correlating ERT with AEM in a rock slide mapping project, same shape but different quantities

Space-Borne and Ground-Based InSAR Data Integration: The Åknes Test Site

Electric resistivity and seismic refraction tomography: a challenging joint underwater survey at Äspö Hard Rock Laboratory

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