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The project includes the work of two PhD candidates, addressing practical problems related to source characterization (Falko Bethmann) and site-effect assessment (Valerio Poggi). In the first part of this PhD project, scaling relations between small and large earthquakes are developed and the potential impact of such relations on estimating maximum near-fault ground motions is studied. In the second part of the project, new techniques for site characterization and site response analysis are implemented. First, a new method to analyze three component array recordings of ambient vibration is developed that allows retrieving the ellipticity functions of the different Rayleigh-wave modes. Subsequently, a procedure to combine passive (ambient vibration) and active-source techniques is proposed, with the goal to improve resolution of array measurements on shallow layers from high frequency component of the wavefield. Finally, generic amplification functions are developed for a common reference condition in Switzerland that serve as input for site-specific seismic hazard assessment. |
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| Project Leader at SED | Donat Fäh |
| SED Project Members | Valerio Poggi, Falko Bethmann, Nico Deichmann |
| Funding Source | SNF |
| Duration | 2006-2010 |
| Keywords | Seismic source characterization, site-effects |
| Research Field | Applied and engineering seismology |
Poggi, V. and Fäh, D. (2010). Estimating Rayleigh wave particle motion from three-component array analysis of ambient vibrations. Geophys. J. Int. 180(1), 251-267. doi: 10.1111/j.1365-246X.2009.04402.x
Poggi, V., Edwards, B. and Fäh, D. (2011). Derivation of a Reference Shear-Wave Velocity Model from Empirical Site Amplification. Bull. Seim. Soc. Am. 101(1), 258-274. doi: 10.1785/0120100060
Poggi, V., Fäh, D. and Giardini, D. (2012). T-f-k analysis of surface waves using the continuous wavelet transform. Pure and Applied Geophysics 170(3), 319-335.
Poggi, V., Fäh, D., Burjanek, J. and Giardini, D. (2012). The use of Rayleigh wave ellipticity for site-specific hazard assessment and microzonation. An application to the city of Luzern (Switzerland). Geophys. J. Int. 188(3), 1154-1172. doi: 10.1111/j.1365-246X.2011.05305.x