Integration of very-high-resolution seismic and CPTU data from a coastal area affected by shallow landsliding - The finneidfjord natural laboratory

M. Vanneste, C. F. Forsberg, S. Knudsen, T. J. Kvalstad, J. S. L’Heureux, T. Lunne, M. E. Vardy, S. Chand, O. Longva, E. Morgan, A. Kopf, T. Mörz, A. Steiner, J. Brendryen, H. Haflidason

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations

Abstract

In 1996, a retrogressive landslide claimed four lives near the village of Finneidfjord, northern Norway. Since then, the area has been developed into a prime natural field laboratory for investigating submarine slope instabilities. Research activities adopt an integrated approach inwhichwe aim to characterize the slip planes involved in the landsliding and understanding the sedimentary processes contributing to failure, including human activity (e.g., road works), the presence of quick clay deposits in the near-shore area as well as shallow gas accumulations in the fjord. In this paper, we focus on the spatial variability of soil conditions in general and the slip plane in particular as evidenced from different vintages of seismic data (very-high-resolution 3D chirp data and multi-channel sparker and boomer data) tied with soil samples and 1D in situ geotechnical logs (CPTU) across the landslide complex and shallow gas accumulation zone. The slip planes correspond to composite, thin event beds characterized by subtle variations in lithology. These event beds demonstrate a laterally variable character across the landslide complex, both in the seismic data and particularly in the CPTU response. Through impedance inversion and modelling and using the geological and geotechnical data as calibration, we have developed methods to derive geotechnical properties (e.g., partial gas saturation, lithology, density) from the seismic data. The integrated approach can be used to investigate similar landslides in coastal areas.

Original languageEnglish (US)
Title of host publicationFrontiers in Offshore Geotechnics III - 3rd International Symposium on Frontiers in Offshore Geotechnics, ISFOG 2015
EditorsVaughan Meyer
PublisherCRC Press/Balkema
Pages1017-1022
Number of pages6
ISBN (Electronic)9781138028487
DOIs
StatePublished - 2015
EventProceedings of the 3rd International Symposium on Frontiers in Offshore Geotechnics, ISFOG 2015 - Oslo, Norway
Duration: Jun 10 2015Jun 12 2015

Publication series

NameFrontiers in Offshore Geotechnics III - 3rd International Symposium on Frontiers in Offshore Geotechnics, ISFOG 2015

Other

OtherProceedings of the 3rd International Symposium on Frontiers in Offshore Geotechnics, ISFOG 2015
CountryNorway
CityOslo
Period6/10/156/12/15

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology

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    Vanneste, M., Forsberg, C. F., Knudsen, S., Kvalstad, T. J., L’Heureux, J. S., Lunne, T., Vardy, M. E., Chand, S., Longva, O., Morgan, E., Kopf, A., Mörz, T., Steiner, A., Brendryen, J., & Haflidason, H. (2015). Integration of very-high-resolution seismic and CPTU data from a coastal area affected by shallow landsliding - The finneidfjord natural laboratory. In V. Meyer (Ed.), Frontiers in Offshore Geotechnics III - 3rd International Symposium on Frontiers in Offshore Geotechnics, ISFOG 2015 (pp. 1017-1022). (Frontiers in Offshore Geotechnics III - 3rd International Symposium on Frontiers in Offshore Geotechnics, ISFOG 2015). CRC Press/Balkema. https://doi.org/10.1201/b18442-149