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https://doi.org/10.5194/esurf-2017-65
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
23 Nov 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Earth Surface Dynamics (ESurf).
Characterizing the complexity of seismic signals at slow-moving clay-rich debris slides: The Super-Sauze (Southeastern France) and Pechgraben (Upper Austria) case studies
Naomi Vouillamoz, Sabrina Rothmund, and Manfred Joswig Insitute for Geophysics, University of Stuttgart, 70174 Stuttgart, Germany
Abstract. Soil and debris slides are prone to rapid and dramatic reactivation. Deformation within the instability is accommodated by sliding, whereby weak seismic energies are released through material deformation. Thus, passive microseismic monitoring provides information that relate to the slope dynamics. In this study, passive seismic data acquired at Super-Sauze (Southeastern France) and Pechgraben (Upper Austria) slow-moving clay-rich debris slides (“clayey landslides”) are investigated. Observations are benchmarked to previous similar case studies to provide a comprehensive and homogenized typology of seismic signals at clayey landslides. A well knowledge of the various seismic signals potentially triggered by the slope deformation is crucial for the future development of automatic detection systems to be implemented in early-warning systems. Detected seismic events range from short duration (< 2 s) quake-like signals to a wide variety of longer duration tremor-like radiations. Complex seismic velocity structures, low-quality signal onsets and non-optimal seismic network geometry severely impedes the source location procedure, thus rendering source processes characterization challenging. Therefore, we constrain sources location using the prominent waveform attenuation pattern characteristic of near (< ~ 50 m) seismic events. A local magnitude scale (ML) for clayey landslides is empirically calibrated using calibration shots and hammer blows data. The derived ML scale returns landslide seismicity rates that correlate in general with higher displacement rates. However, high temporal and spatial resolution analyses of the landslide dynamics and hydrology are required to better decipher the potential relations linking landslide-induced seismic signals to landslide deformation.

Citation: Vouillamoz, N., Rothmund, S., and Joswig, M.: Characterizing the complexity of seismic signals at slow-moving clay-rich debris slides: The Super-Sauze (Southeastern France) and Pechgraben (Upper Austria) case studies, Earth Surf. Dynam. Discuss., https://doi.org/10.5194/esurf-2017-65, in review, 2017.
Naomi Vouillamoz et al.
Naomi Vouillamoz et al.
Naomi Vouillamoz et al.

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Short summary
Evaluating landslide-induced seismicity and characterizing its occurrence in space and time enable to monitor and map dynamics of the landslide in near real-time. We present a classification of seismic signals observed at clay-rich debris slides. We further discuss the limitations held in the characterization of seismic source processes due to complex velocity structures in the landslide body and extreme scattering and attenuation effects of the seismic signal waveforms.
Evaluating landslide-induced seismicity and characterizing its occurrence in space and time...
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