Effect of soil and bedrock anelasticity on the S -wave amplification function
We analyse how intrinsic attenuation and bedrock elasticity affect the amplitude and frequency of the resonance peaks of the S-wave amplification function. The Zener model (with a single relaxation peak) and the constant-Q model are used to describe attenuation. We consider two different cases, name...
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Online Access: | http://hdl.handle.net/11381/2825123 https://doi.org/10.1093/gji/ggw402 |
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ftunivparmairis:oai:air.unipr.it:11381/2825123 2024-04-14T08:03:59+00:00 Effect of soil and bedrock anelasticity on the S -wave amplification function Carcione, José M. Picotti, Stefano Giorgi, Massimo Pettenati, Franco FRANCESE, Roberto Carcione, José M. Picotti, Stefano Francese, Roberto Giorgi, Massimo Pettenati, Franco 2017 http://hdl.handle.net/11381/2825123 https://doi.org/10.1093/gji/ggw402 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000396814800031 volume:208 issue:1 firstpage:424 lastpage:431 numberofpages:8 journal:GEOPHYSICAL JOURNAL INTERNATIONAL http://hdl.handle.net/11381/2825123 doi:10.1093/gji/ggw402 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85014585818 Amplification function Anelasticity Glaciers S-waves info:eu-repo/semantics/article 2017 ftunivparmairis https://doi.org/10.1093/gji/ggw402 2024-03-21T18:38:39Z We analyse how intrinsic attenuation and bedrock elasticity affect the amplitude and frequency of the resonance peaks of the S-wave amplification function. The Zener model (with a single relaxation peak) and the constant-Q model are used to describe attenuation. We consider two different cases, namely, the soil is softer than the bedrock (the usual situation, that is, a sediment overlying a stiff formation) and the upper layer is stiffer than the lower half-space (e.g. basalt over sediment). The presence of Zener loss in the upper layer causes a shift of the fundamental peak towards the low frequencies, while no shift is observed due to the non-rigid (viscoelastic) character of the half-space. In the constant-Q case, the shift to the low frequencies is not significant implying that it is difficult to estimate the attenuation parameters on the basis of the location of the resonance peaks. However, attenuation affects the amplitude of the higher modes, while these modes have the same amplitude of the fundamental mode no matter the degree of elasticity of the half-space. Attenuation of the layer and non-rigidity of the half-space affect the peaks, with the latter having a stronger effect. Examples are given, considering two real cases representing a glacier in Northern Italy and an ice stream in the Antarctic continent. Article in Journal/Newspaper Antarc* Antarctic Archivio della ricerca dell'Università di Parma (CINECA IRIS) Antarctic The Antarctic Geophysical Journal International 208 1 424 431 |
institution |
Open Polar |
collection |
Archivio della ricerca dell'Università di Parma (CINECA IRIS) |
op_collection_id |
ftunivparmairis |
language |
English |
topic |
Amplification function Anelasticity Glaciers S-waves |
spellingShingle |
Amplification function Anelasticity Glaciers S-waves Carcione, José M. Picotti, Stefano Giorgi, Massimo Pettenati, Franco FRANCESE, Roberto Effect of soil and bedrock anelasticity on the S -wave amplification function |
topic_facet |
Amplification function Anelasticity Glaciers S-waves |
description |
We analyse how intrinsic attenuation and bedrock elasticity affect the amplitude and frequency of the resonance peaks of the S-wave amplification function. The Zener model (with a single relaxation peak) and the constant-Q model are used to describe attenuation. We consider two different cases, namely, the soil is softer than the bedrock (the usual situation, that is, a sediment overlying a stiff formation) and the upper layer is stiffer than the lower half-space (e.g. basalt over sediment). The presence of Zener loss in the upper layer causes a shift of the fundamental peak towards the low frequencies, while no shift is observed due to the non-rigid (viscoelastic) character of the half-space. In the constant-Q case, the shift to the low frequencies is not significant implying that it is difficult to estimate the attenuation parameters on the basis of the location of the resonance peaks. However, attenuation affects the amplitude of the higher modes, while these modes have the same amplitude of the fundamental mode no matter the degree of elasticity of the half-space. Attenuation of the layer and non-rigidity of the half-space affect the peaks, with the latter having a stronger effect. Examples are given, considering two real cases representing a glacier in Northern Italy and an ice stream in the Antarctic continent. |
author2 |
Carcione, José M. Picotti, Stefano Francese, Roberto Giorgi, Massimo Pettenati, Franco |
format |
Article in Journal/Newspaper |
author |
Carcione, José M. Picotti, Stefano Giorgi, Massimo Pettenati, Franco FRANCESE, Roberto |
author_facet |
Carcione, José M. Picotti, Stefano Giorgi, Massimo Pettenati, Franco FRANCESE, Roberto |
author_sort |
Carcione, José M. |
title |
Effect of soil and bedrock anelasticity on the S -wave amplification function |
title_short |
Effect of soil and bedrock anelasticity on the S -wave amplification function |
title_full |
Effect of soil and bedrock anelasticity on the S -wave amplification function |
title_fullStr |
Effect of soil and bedrock anelasticity on the S -wave amplification function |
title_full_unstemmed |
Effect of soil and bedrock anelasticity on the S -wave amplification function |
title_sort |
effect of soil and bedrock anelasticity on the s -wave amplification function |
publishDate |
2017 |
url |
http://hdl.handle.net/11381/2825123 https://doi.org/10.1093/gji/ggw402 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000396814800031 volume:208 issue:1 firstpage:424 lastpage:431 numberofpages:8 journal:GEOPHYSICAL JOURNAL INTERNATIONAL http://hdl.handle.net/11381/2825123 doi:10.1093/gji/ggw402 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85014585818 |
op_doi |
https://doi.org/10.1093/gji/ggw402 |
container_title |
Geophysical Journal International |
container_volume |
208 |
container_issue |
1 |
container_start_page |
424 |
op_container_end_page |
431 |
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1796300318774919168 |