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Source-related variability of site response in the Mygdonian Basin (Greece) from accelerometric recordings and 3D numerical simulations

Emeline Maufroy, Emmanuel Chaljub, Nikolaos P. Theodoulidis, Zafeiria Roumelioti, Fabrice Hollender, Pierre-Yves Bard, Florent de Martin, Cedric Guyonnet-Benaize and Ludovic Margerin
Source-related variability of site response in the Mygdonian Basin (Greece) from accelerometric recordings and 3D numerical simulations
Bulletin of the Seismological Society of America (January 2017) 107 (2): 787-808

Abstract

We compare different methods to estimate frequency-domain amplification and duration lengthening of earthquake ground motion in the Mygdonian basin (Greece). Amplification is measured by standard spectral ratios (SSRs) of horizontal component or by single-station earthquake horizontal-to-vertical ratios (EHVRs). Duration lengthening is measured either by the group delay method (Beauval et al., 2003) and labeled GDDL, or based on the significant duration (Trifunac and Brady, 1975) and labeled TBDL. The methods are applied both to high-quality recordings of the European experimental site EUROSEISTEST array and to a large set of 3D synthetics computed in a new basin model for 1260 sources regularly distributed in depth, distance, and azimuth from the center of the array.The analysis of the recordings in the center of the basin shows an anticorrelation between amplification and duration lengthening, that is, maxima (resp. minima) of GDDL correspond to minima (resp. maxima) of SSR. The maxima of GDDL are also found to coincide with those of SSR variability. This is confirmed by the analysis of the synthetics, which also reveals a pronounced north-south asymmetry of both amplification and duration lengthening caused by nonisotropic excitation of surface waves at the basin edges. We find that all estimates of site response depend on source location and that EHVR is also strongly sensitive to energy partitioning in the analyzed wavefield. We quantify the source-related variability of each estimate, discuss the biases in site response estimation using incomplete source catalogs, and investigate whether the azimuthal dependence of site response can be identified in the recordings. Electronic Supplement: Movies of simulated wave propagation, figures of surface-to-downhole standard spectral ratio (SSR), group delay duration lengthening (GDDL), earthquake horizontal-to-vertical ratio (EHVR), and synthetic waveforms.


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 107
Serial Issue: 2
Title: Source-related variability of site response in the Mygdonian Basin (Greece) from accelerometric recordings and 3D numerical simulations
Affiliation: Universite Grenoble Alpes, Institut des Sciences de la Terre, Grenoble, France
Pages: 787-808
Published: 20170117
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 47
Accession Number: 2017-015811
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 5 tables, geol. sketch maps
N40°30'00" - N40°49'60", E23°00'00" - E23°40'00"
Secondary Affiliation: Institute of Engineering Seismology and Earthquake Engineering, GRC, GreeceAristotle University of Thessaloniki, GRC, GreeceBureau de Recherches Geologiques et Minieres, FRA, FranceCommissariat a l'Energie Atomique et aux Energies Alternatives, FRA, FranceInstitut de Recherches en Astrophysique et Planetologie, FRA, France
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201711
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