An integrated geophysical survey at a landslide-prone area

Koya Suto; Milovan Urosevic; Sinisa Arsenovic; Jun Sugawara

doi:10.1071/ASEG2016ab296

25th International Conference and Exhibition – Interpreting the Past, Discovering the Future

ISSN: 2202-0586
E-ISSN:

oa An integrated geophysical survey at a landslide-prone area
Authors Koya Suto^a, Milovan Urosevic^b, Sinisa Arsenovic^c and Jun Sugawara^d
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^a Terra Australis Geophysica Pty Ltd, Brisbane, [email protected] ^b Curtin University, Perth, [email protected] ^c CTU-IPKIN d.o.o, Bosnia and Herzegovina, [email protected] ^d WorleyParsons Brisbane, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2016, Issue 25th International Conference and Exhibition – Interpreting the Past, Discovering the Future, Dec 2016, p. 1 - 5
DOI: https://doi.org/10.1071/ASEG2016ab296
- Published online: 01 Dec 2016

Abstract

A heavy rainfall of May 2014, caused an extensive disaster to the catchment of River Sava in Serbia and Bosnia and Herzegovina (BiH). The number of landslides exceeded 2000 in Serbia and BiH. This prompted an urgent investigation of the areas which have potential of further landslide.

Association of Geoscientists and Environmentalists of Serbia (AGES) initiated a project of geophysical investigation of these areas supported by Geoscientists without Borders (GwB) of Society of Exploration Geophysicists (SEG). Over twenty students participated from three countries and more than ten technical professionals from six countries joined in the project.

Reflection seismic, MASW and resistivity surveys were carried out in the Vrazici area in BiH in June 2015. Two survey lines were surveyed totaling about 120 meters along a slope of grassland and orchard.

A clear increase of S-wave velocity from 250 to 350m/s at about 3 to 5m below the ground surface is observed by the MASW analysis, which is consistent with the reflection profile at the same area. This depth roughly corresponds to the resistivity boundary at 80 ohm-m. It is interpreted the interface between soft soils and relatively competent rock. The depth profiles of these boundaries show that the soft soils are thicker toward the lower part of the slope. This landslide can be classified as Varnes’s classification “earth slide or earth flow”.

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References

Park, C B, Miller R D and Xia, J 1999, Multichannel analysis of surface waves, Geophysics Vol. 64, pp 800-808.
SBS, 2015. Balkan’s floods: Damage estimated to cost $4.5 billion, http://www.sbs.com.au/news/storystream/balkans-floods-damage-estimated-cost-45-billion, accessed on 14 December 2015.
Society of Exploration Geophysicists, Geoscientists without Borders, http://www.seg.org/geoscientists-without-borders#&panel1-3, accessed 14 December 2015.
Shan, C, Bastani, M, Malehmir, A, Persson, L, and Engdahl, M, 2013, Integrated 2D modeling and interpretation of geophysical and geotechnical data to delineate quick clays at a landslide site in southwest Sweden, Geophysics, vol 19.No.4, pp EN61-75.
Suto K, Arsenovic S, Sugawara J and Aizawa T, 2016, An investigation of a landslide-prone area by MASW and resistivity surveys, Proceedings of 29th Annual Symposium on the Application of Geophysics to Engineering and Environmental Problems (SAGEEP), Denver, US.
Suto K and Kristinoff R, 2014, Use of an MASW Survey to assess flood damaged road - A case history, Proceedings of 27th Annual Symposium on the Application of Geophysics to Engineering and Environmental Problems (SAGEEP), Boston, US, pp 406-411.
Varnes, D.J., 1978, Slope movement types and processes, in Schuster, R.L. and Krizek eds., Special Report 176: Landslides: Analysis and Control,Transportation and Road Research Board, National Academy of Science, pp11-33.

/content/journals/10.1071/ASEG2016ab296

Article Type: Research Article

Keyword(s): landslide; MASW; near-surface geophysics; resistivity; seismic reflection

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