1D velocity structure of the Po River plain (Northern Italy) assessed by combining strong motion and ambient noise data

摘要: Strong ground motions recorded on the sedimentary deposits of Po River alluvial plain during Emilia (Northern Italy) Mw 5.7 earthquake May 29, 2012 are used to assess vertical profile shear-wave velocity above limestone basement. Data were collected by a linear array installed for site effect studies after 5.9 mainshock 20, 2012. The stations, equipped with both strong and weak motion sensors, aligned in South–North direction, at distances ranging from 1 26 km epicenter. components show very distinctive, large-amplitude, low-frequency dispersive wave trains. Wavelet analysis yields group-velocity dispersion curve 0.2–0.7 Hz frequency band. availability long ambient noise record allows estimates resonance along its stability among stations. joint inversion surface waves ellipticity curves derived H/V extending investigations down sediment-limestone interface, depth about 5,000 m. Our results add new information structure scale that is intermediate between local already investigated other authors small-aperture arrays using regional inferred modeling seismogram waveforms hundreds kilometers source.