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Overview of available data

Overview of available data. Swiss Sites. FLACH. X. FLACH. 4 Hz. WILA. X. WILA. 5 Hz. WILA. Relatively strong attenuation. BALST. X. BALST. 2.5 Hz. AIGLE. X. AIGLE. DAVOX. X. DAVOX. 1.5 Hz. Issues. INTR - N. “polluted” noise.

jennifer-bolton
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Overview of available data

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  1. Overview of available data

  2. Swiss Sites

  3. FLACH X

  4. FLACH 4 Hz

  5. WILA X

  6. WILA 5 Hz

  7. WILA Relatively strong attenuation

  8. BALST X

  9. BALST 2.5 Hz

  10. AIGLE X

  11. AIGLE

  12. DAVOX X

  13. DAVOX 1.5 Hz

  14. Issues INTR - N “polluted” noise

  15. Topographic amplification studies based on earthquake resposne spectra (C. Cauzzi, SED) Combined used of numerical simulations (Sulmona, Irpinia) and recorded data; Relating topographic amplification with the local altitude, slope, and estimated natural frequencies of the relief; Focus on main topographic categories of the Eurocode 8 for station selection (data from CH, IT and JP); Measure kappa from response spectra to understand the role of attenuation on the observed amplification;

  16. Next steps • WCEE abstract submitted (though the deadline for the paper submission is approaching …) • Common processing tools for polarization analysis: • What should we compare? (frequencies, angles + uncertainties) • What should we do with earthquake data? • kappa (Carlo) • polarization – comparison with noise results • ??? • Shallow geophysics - Active Noise correlation with D arrays (Cecile?) • Work on DEM models (comparison with INGV Milan – V. Pessina)

  17. Modelling examples

  18. Modelling of unstable rockslopes (extreme case - Randa) 3Hz (Burjanek et al., GJI, 2010 Moore et al., BSSA, 2011)

  19. Modelling of unstable rockslopes (extreme case - Randa) • FE element modelling of eigen-modes • Effective elastic properties (Vs=900m/s) necessary to fit eigen-frequency of 3Hz (Burjanek et al., ESG, 2011)

  20. Modelling of unstable rockslopes (extreme case) • simulations of model wit cracks perfromed with UDEC (Moore et al., BSSA, 2011)

  21. Modelling of unstable rockslopes (extreme case - Randa) Modelled site-to-reference s. ratio Modelled crack displacement Observed crack displacement Observed site-to-reference s. ratio (Moore et al., BSSA, 2011)

  22. Modelling of unstable rockslopes (extreme case - Rawilhorn) • 1946 M6 Earthquake doublet (separated by 4 months) • Second event triggered the rockfall

  23. Modelling of unstable rockslopes (extreme case - Rawilhorn) After M6.1 earthquake (Moore et al., ISL, 2012)

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