Thiswork focuses on the characterization of seismic sources observed in clay–shale landslides. Two landslides are considered: Super-Sauze (France) and Valoria (Italy). The two landslides are developed in reworked clay–shales but differ in terms of dimensions and displacement rates. Thousands of seismic signals have been identified by a small seismic array in spite of the high-seismic attenuation of the material. Several detection methods are tested. A semiautomatic detection method is validated by the comparison with a manual detection. Seismic signals are classified in three groups based on the frequency content, the apparent velocity and the differentiation of P and S waves. It is supposed that the first group of seismic signals is associated to shearing or fracture events within the landslide bodies, while the second group may correspond to rockfalls or debris flows. A last group corresponds to external earthquakes. Seismic sources are located with an automatic beam-forming location method. Sources are clustered in several parts of the landslide in agreement with geomorphological observations. We found that the rate of rockfall and fracture events increases after periods of heavy rainfall or snowmelt. The rate of microseismicity and rockfall activity is also positively correlated with landslide displacement rates. External earthquakes did not influence the microseismic activity or the landslide movement, probably because the earthquake ground motion was too weak to trigger landslide events during the observation periods.

Seismic monitoring of soft-rock landslides: Super-Sauze and Valoria landslides case studies / Tonnellier, A.; Helmstetter, A.; Malet, J. P.; Schmittbuhl, J.; Corsini, Alessandro; Joswig, M.. - In: GEOPHYSICAL JOURNAL INTERNATIONAL. - ISSN 1365-246X. - STAMPA. - 193:(2013), pp. 1515-1536. [10.1093/gji/ggt039]

Seismic monitoring of soft-rock landslides: Super-Sauze and Valoria landslides case studies

CORSINI, Alessandro;
2013

Abstract

Thiswork focuses on the characterization of seismic sources observed in clay–shale landslides. Two landslides are considered: Super-Sauze (France) and Valoria (Italy). The two landslides are developed in reworked clay–shales but differ in terms of dimensions and displacement rates. Thousands of seismic signals have been identified by a small seismic array in spite of the high-seismic attenuation of the material. Several detection methods are tested. A semiautomatic detection method is validated by the comparison with a manual detection. Seismic signals are classified in three groups based on the frequency content, the apparent velocity and the differentiation of P and S waves. It is supposed that the first group of seismic signals is associated to shearing or fracture events within the landslide bodies, while the second group may correspond to rockfalls or debris flows. A last group corresponds to external earthquakes. Seismic sources are located with an automatic beam-forming location method. Sources are clustered in several parts of the landslide in agreement with geomorphological observations. We found that the rate of rockfall and fracture events increases after periods of heavy rainfall or snowmelt. The rate of microseismicity and rockfall activity is also positively correlated with landslide displacement rates. External earthquakes did not influence the microseismic activity or the landslide movement, probably because the earthquake ground motion was too weak to trigger landslide events during the observation periods.
2013
193
1515
1536
Seismic monitoring of soft-rock landslides: Super-Sauze and Valoria landslides case studies / Tonnellier, A.; Helmstetter, A.; Malet, J. P.; Schmittbuhl, J.; Corsini, Alessandro; Joswig, M.. - In: GEOPHYSICAL JOURNAL INTERNATIONAL. - ISSN 1365-246X. - STAMPA. - 193:(2013), pp. 1515-1536. [10.1093/gji/ggt039]
Tonnellier, A.; Helmstetter, A.; Malet, J. P.; Schmittbuhl, J.; Corsini, Alessandro; Joswig, M.
File in questo prodotto:
File Dimensione Formato  
2013 - Tonnelier et al - Geophys. J. Int. ggt039.pdf

Accesso riservato

Tipologia: Versione pubblicata dall'editore
Dimensione 7.29 MB
Formato Adobe PDF
7.29 MB Adobe PDF   Visualizza/Apri   Richiedi una copia
Pubblicazioni consigliate

Licenza Creative Commons
I metadati presenti in IRIS UNIMORE sono rilasciati con licenza Creative Commons CC0 1.0 Universal, mentre i file delle pubblicazioni sono rilasciati con licenza Attribuzione 4.0 Internazionale (CC BY 4.0), salvo diversa indicazione.
In caso di violazione di copyright, contattare Supporto Iris

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/784692
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 34
  • ???jsp.display-item.citation.isi??? 32
social impact