Integrating Seismic Methods for Characterizing and Monitoring Landslides: A Case Study of the Heinzenberg Deep-Seated Gravitational Slope Deformation (Switzerland)

• Published in: Geosciences (Basel) Vol. 14; no. 2; p. 28
• Main Authors: Glueer, Franziska, Mreyen, Anne-Sophie, Cauchie, Léna, Havenith, Hans-Balder, Bergamo, Paolo, Halló, Miroslav, Fäh, Donat
• Format: Journal Article Web Resource
• Language: English
• Published: Basel MDPI AG 01.01.2024
• Subjects: 14th century; ambient vibrations; Analysis; Bayesian analysis; Deformation; Deformations (Mechanics); Earth sciences & physical geography; Environmental aspects; General Earth and Planetary Sciences; Geodetic measurements; Geomechanics; Geomorphology; Gravity; Lakes; landslide; Landslides; Landslides & mudslides; Morphology; Physical, chemical, mathematical & earth Sciences; Physique, chimie, mathématiques & sciences de la terre; Polarization; Probability theory; Refilling; Resonant frequencies; Rock; Rock masses; Rocks; S waves; Sciences de la terre & géographie physique; Seismic activity; seismic array analysis; Seismic exploration; Seismic velocities; Shear wave velocities; shear-wave velocity profiles; site amplification; Slopes; Slopes (Physical geography); Structures; Surface water waves; surface wave analysis; Surface waves; Switzerland; Topography; Vegetation; Wave analysis; Wave propagation; Wave velocity; Switzerland
• ISSN: 2076-3263; 2076-3263
• DOI: 10.3390/geosciences14020028

While geodetic measurements have long been used to assess landslides, seismic methods are increasingly recognized as valuable tools for providing additional insights into subsurface structures and mechanisms. This work aims to characterize the subsurface structures of the deep-seated gravitational slope deformation (DSGSD) at Heinzenberg through the integration of active and passive seismic measurements. Seismic techniques can hereby deliver additional information on the subsurface structure and mechanisms involved, e.g., the degree of rock mass degradation, the resonant frequencies of the potentially unstable compartments, and the local fracture network orientations that are influenced by wavefield polarization. By employing advanced methods such as H/V analysis, site-to-reference spectral ratios, polarization analysis, surface wave analysis, and the joint multizonal transdimensional Bayesian inversion of velocity structures, we establish a comprehensive baseline model of the landslide at five selected sites. This baseline model shall help identify potential changes after the refilling of Lake Lüsch, which started in 2021. Our results reveal the rupture surface of the DSGSD at various depths ranging from 30 m at the top to over 90 m in the middle of the slope. Additionally, we estimate key parameters including the shear wave velocities of the different rock masses. The 2D geophysical profiles and rock mass properties contribute to the understanding of the subsurface geometry, geomechanical properties, and potential water pathways. This study demonstrates the significance of integrating seismic methods with traditional geodetic measurements and geomorphologic analysis techniques for a comprehensive assessment of landslides, enhancing our ability to monitor and mitigate hazardous events.