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

Title1D velocity structure of the Po River plain (Northern Italy) assessed by combining strong motion and ambient noise data
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2014
AuthorsMilana, G., Bordoni P., Cara F., Di Giulio G., Hailemikael S., and Rovelli A.
JournalBulletin of Earthquake Engineering
Volume12
Pagination2195-2209
ISSN1570761X
KeywordsAcoustic noise, Curve fitting, Deep alluvium, Dispersion (waves), Earthquake effects, Earthquakes, Frequency bands, Group velocity dispersion, Group velocity dispersion curve, Limestone, Motion analysis, Resonance frequencies, Sedimentary deposits, Shear flow, Shear waves, Small aperture arrays, Strong ground motion, Strong motion datum, Surface waves, Velocity, Velocity model, wave propagation, Wavelet analysis
Abstract

Strong ground motions recorded on the sedimentary deposits of the Po River alluvial plain during the Emilia (Northern Italy) Mw 5.7 earthquake of May 29, 2012 are used to assess the vertical profile of shear-wave velocity above the limestone basement. Data were collected by a linear array installed for site effect studies after the Mw 5.9 mainshock of May 20, 2012. The array stations, equipped with both strong and weak motion sensors, are aligned in the South–North direction, at distances ranging from 1 to 26 km from the epicenter. The vertical components of ground motion show very distinctive, large-amplitude, low-frequency dispersive wave trains. Wavelet analysis yields group-velocity dispersion curve in the 0.2–0.7 Hz frequency band. The availability of a long ambient noise record allows estimates of the site resonance frequency along with its stability among stations. The joint inversion of dispersion of surface waves and ellipticity curves derived from ambient noise H/V allows extending investigations down to the sediment-limestone interface, at a depth of about 5,000 m. Our results add new information about the velocity structure at a scale that is intermediate between the local scale already investigated by other authors with small-aperture arrays using ambient noise and the regional scale inferred from modeling of seismogram waveforms recorded at hundreds of kilometers from the source. © 2013, Springer Science+Business Media Dordrecht.

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URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-84920249716&doi=10.1007%2fs10518-013-9483-y&partnerID=40&md5=1b3c84f5a57e7b0e25c984f99e89fdb7
DOI10.1007/s10518-013-9483-y
Citation KeyMilana20142195