Ambient Noise Measurements to Constrain the Geological Structure of the Güevéjar Landslide (S Spain)

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Delgado, José and Galiana Merino, Juan José and García-Tortosa, Francisco J. and Garrido, Jesús and Lenti, Luca and Martino, Salvatore and Peláez, José A. and Rodríguez Peces, Martín Jesús and Sanz De Galdeano-Equiza, Carlos and Soler Llorens, Juan L. (2021) Ambient Noise Measurements to Constrain the Geological Structure of the Güevéjar Landslide (S Spain). Applied Sciences, 11 (1454). ISSN 2076-3417

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Official URL: https://doi.org/10.3390/app11041454




Abstract

The reactivation of very large landslides may cause severe damage to society. Its prevention and management requires detailed information on the geometry and structure of these landslides, but the use of standard techniques (boreholes) may be prohibitive from an economic point of view. To overcome these difficulties, geophysical techniques are of special interest because they allow for studying very large areas at a reasonable cost. In this paper, we present a case study wherein the analysis of ambient noise allowed us to produce a model of a large landslide near Granada (southern Spain). The geometry and location of the failure zone, as well as the assessment of the state of involved materials, were estimated by combining two available boreholes and different geophysical techniques (downhole tests and the spectral analysis of ambient noise, horizontal to vertical spectral ratios (HVSR) and the frequency-wavenumber (f-k) methods). The results have allowed us to differentiate between values within the landslide mass with respect to those of stable materials, and to perform for the first time a comprehensive geological model of this unstable mass. Differences were also observed within the landslide mass (earth flow vs. slide zones), which are attributed to differences in the degree of alteration and the disturbance of the internal structure of materials constituting the landslide mass. These results show that techniques based on the measurement of ambient noise are of special interest for studying very large, highly remolded landslide masses.


Item Type:Article
Uncontrolled Keywords:landslide, geophysical prospecting, ambient noise, f-k technique, HVSR
Subjects:Sciences > Physics > Geophysics
Sciences > Geology > Geodynamics
ID Code:64212
Deposited On:01 Mar 2021 16:39
Last Modified:02 Mar 2021 07:49

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