Airborne geophysical mapping as an innovative methodology for landslide investigation: evaluation of results from the Gschliefgraben landslide, Austria
In September 2009, a complex airborne geophysical survey was performed in the large landslide affected area of the Gschliefgraben valley, Upper Austria, in order to evaluate the applicability of this method for landslide detection and mapping. An evaluation of the results, including different remote...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2013-12-01
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| Series: | Natural Hazards and Earth System Sciences |
| Online Access: | http://www.nat-hazards-earth-syst-sci.net/13/3313/2013/nhess-13-3313-2013.pdf |
| Summary: | In September 2009, a complex airborne geophysical survey was performed in
the large landslide affected area of the Gschliefgraben valley, Upper
Austria, in order to evaluate the applicability of this method for landslide
detection and mapping. An evaluation of the results, including different
remote-sensing and ground-based methods, proved that airborne geophysics,
especially the airborne electromagnetic method, has a high potential for
landslide investigation. This is due to its sensitivity to fluid and clay
content and porosity, which are parameters showing characteristic values in
landslide prone structures. Resistivity distributions in different depth
levels as well as depth slices along selected profiles are presented and
compared with ground geoelectrical profiles for the test area of
Gschliefgraben.
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Further interesting results can be derived from the radiometric survey,
whereas the naturally occurring radioisotopes <sup>40</sup>K and <sup>232</sup>Th, as
well as the man-made nuclide <sup>137</sup>Cs have been considered. While the
content of potassium and thorium in the shallow subsurface layer is
expressively related to the lithological composition, the distribution of
caesium is mainly determined by mass wasting processes. |
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| ISSN: | 1561-8633 1684-9981 |