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Integrated geophysical-geological model for seismic local site response: the Caldes alpine slope case (Southern Alps, NE Italy)

  • Jacopo Boaga
  • Michela Carrer
  • Fabio Fedrizzi
  • Silvana Martin
  • Alfio Viganò
Original Article
  • 169 Downloads

Abstract

We present the seismic local response analysis of an alpine slope based on an integrated geophysical and geological model. The studied site is located in Caldes, in the lower Val di Sole valley in the Trentino region, Southern Italian Alps. Caldes represents the typical alpine valley formed by glacial and fluvio-glacial processes characterized by complex geomorphological, lithological and tectonic settings. A detailed reconstruction of the valley slope geology (subsoil geometry and stratigraphy) was obtained using electrical tomography resistivity soundings, controlled source multi-channel analysis of surface waves, microtremor single station measurements, borehole investigations, and geotechnical analyses on undisturbed samples. The geological model was shaken with real accelerometric series to obtain 1D (linear equivalent approach) and 2D (finite element approach) local seismic responses. The results, considering the uncertainties of the geophysical measurements, show different seismic responses between 1D and 2D approaches due to relevant geometrical amplifications, with clearer variations in the 2D approach. The comparison of the results with the building code design spectra shows the limits of the simplified approaches, suggesting that detailed characterizations are necessary, especially for such populous alpine environments.

Keywords

Slope seismic response Geophysical prospecting Shear-wave velocity measurements Seismic hazard 

Notes

Acknowledgments

The authors thank the Geological Survey of the Autonomous Province of Trento, particularly Claudia Tomazzolli and Bruno Ercolani (Geotechnical Laboratory) and Paolo Trainotti. Authors also thank Dr. Nancy Jenkins for the language revision.

Supplementary material

12665_2015_5082_MOESM1_ESM.pdf (269 kb)
Supplementary material 1 (PDF 268 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Jacopo Boaga
    • 1
  • Michela Carrer
    • 2
  • Fabio Fedrizzi
    • 3
  • Silvana Martin
    • 1
  • Alfio Viganò
    • 4
  1. 1.Dipartimento di GeoscienzeUniversità di PadovaPaduaItaly
  2. 2.SNAMSan Donato MilaneseItaly
  3. 3.Servizio GeologicoProvincia Autonoma di TrentoTrentoItaly
  4. 4.Istituto Nazionale di Oceanografia e di Geofisica SperimentaleSezione CRSUdineItaly

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