دورية أكاديمية
High frequency attenuation of S waves in alluvial deposits of the central Po Plain (northern Italy)
| العنوان: | High frequency attenuation of S waves in alluvial deposits of the central Po Plain (northern Italy) |
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| المؤلفون: | Franceschina, Gianlorenzo, Tento, Alberto |
| المساهمون: | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Milano, Milano, Italia, Retired, CNR - Istituto per la Dinamica dei Processi Ambientali, Milano, Italia |
| بيانات النشر: | Oxford University Press |
| سنة النشر: | 2023 |
| المجموعة: | Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia) |
| مصطلحات موضوعية: | Earthquake ground motions, Seismic attenuation, Site effects, Wave propagation, Wave scattering and diffraction, 04.06. Seismology |
| الوصف: | This article has been accepted for publication in Geophysical Journal International ©:The Author(s) 2023. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.Uploaded in accordance with the publisher's self-archiving policy. All rights reserved. ; Estimation of local seismic response plays a key role in assessing local seismic hazard and particularly in the design of shaking scenarios. Modelling local seismic response involves knowing of the shear wave velocity (Vs) and quality factor (Qs) profiles for the site in question. The many techniques that have been developed to assess Vs in surface deposits produce reliable measurements of Vs , but these rarely correspond to direct measurements of Qs . The latter is often considered through damping measures from laboratory tests on small-scale soil samples, which can provide information primarily on intrinsic attenuation, neglecting the contribution of scattering effects. In this paper, using seismic recordings obtained at the surface and in boreholes at 100 m depth, we estimate an average value of Qs of some characteristic alluvial deposits of the Po Plain (northern Italy). Data come from a microseismic network which sampled an almost uniform lithology in the central Po Plain and consisted of three surface and four borehole stations with an interstation distance of about 2 km. The average value of Qs of the shallowest 100 m of the sedimentary strata, Qs100, is estimated by considering: (1) the high-frequency attenuation of seismic waves due to propagation through the corresponding stratigraphy and (2) the interference between incident and surface-reflected waves observed at borehole stations. We parametrize the first through k0_100, the difference between the values of the spectral decay parameter kappa (k) estimated at the surface and at the boreholes depth, respectively. We use the second in order to compute Vs100, the time-averaged Vs referred to the uppermost 100 m stratigraphy. We obtain: k0_100 = (11 ± 3) ms, ... |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| تدمد: | 0956-540X 1365-246X |
| العلاقة: | Geophysical Journal International; /234 (2023); http://hdl.handle.net/2122/16919Test |
| DOI: | 10.1093/gji/ggad185 |
| الإتاحة: | https://doi.org/10.1093/gji/ggad185Test http://hdl.handle.net/2122/16919Test |
| حقوق: | open |
| رقم الانضمام: | edsbas.89D1F514 |
| قاعدة البيانات: | BASE |
| تدمد: | 0956540X 1365246X |
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| DOI: | 10.1093/gji/ggad185 |