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  • Seismological Society of America  (4)
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  • 1
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    Can We Trust High-Frequency Content in Strong-Motion Database Signals? Impact of Housing, Coupling, and Installation Depth of Seismic Sensors (2020)
    Seismological Society of America
    Details
    Publication Date: 2020-05-06
    Description: Seismic hazard studies provide indicators of seismic motion that are expressed for “free-field,” that is, representative of the ground motion exactly at the free surface, without disturbances due to interactions between soil and buildings or other structures. Most of these studies are based on ground-motion prediction equations, which are, themselves, formulated to predict free-field motion, as they are derived from similarly free data. However, is this really the case? In this study, we use several examples to illustrate how small structures hosting permanent strong-motion stations (often anchored on small concrete slabs) generate soil–structure interaction effects that can amplify the high-frequency part of the earthquake signal (〉10  Hz) by up to a factor of 2–3 for stations on soils. We also show that the installation depth of a station, even if very shallow (i.e., a few meters), can change the recorded response, mainly by deamplifying the signal in high frequencies (〉10  Hz) by a factor up to 0.3. Such effects imply that there are actual differences between recorded and true free-field signals. Depending on the housing conditions, these effects can have significant impact on response spectra at high frequencies, and on measurements of the κ parameter. It is, thus, becoming clear that such effects should be taken into account in studies involving high-frequency seismic motion. To do so, scientists need a detailed description of the conditions of installation and housing of seismological and accelerometric stations, which often lacks from the metadata distributed through the various, commonly used web services. Increasing such information and facilitating the access to it would allow the identification of stations that are problematic and of those that are truly close to free-field recording conditions. In a subsequent step, it would be important to quantify the modification curve of the response of stations that experience such effects.
    Print ISSN: 0895-0695
    Electronic ISSN: 1938-2057
    Topics: Geosciences
    Published by Seismological Society of America
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  • 2
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    RESIF RAP and RLBP Dataset of Earthquake Ground Motion in Mainland France (2020)
    Seismological Society of America
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    Publication Date: 2020-05-06
    Description: This work presents the implementation of a high standards dataset of earthquake ground motions recorded in Metropolitan France between 1996 and 2016. This dataset is intended to serve the scopes of a large seismological community; however, its primary aims are engineering seismology and earthquake engineering applications. The dataset includes records from broadband and accelerometric sensors provided by permanent and temporary seismic networks operated by French research institutions and partners grouped within the Réseau Sismologique et géodésique Français (RESIF) consortium (see Data and Resources). All the waveforms are first homogenized to acceleration units and underwent a full quality control process including: (1) visual verification and manual phase picking, (2) processing scheme, and (3) consistency check by residual analysis. These make the dataset fully compliant with international standards. Finally, the RESIF dataset includes more than 6500 quality-checked records from 468 earthquakes recorded at 379 stations. Over the 379 stations included in the dataset, 177 are permanent stations (RA and FR networks) and 202 are temporary stations (YP and X7 networks). The dataset is complete down to magnitude ML 3.5 over the whole French territory and less (about ML 2.5) in the eastern part. Magnitudes range from ML 2.4 to 5.6 and from Mw 2.0 to 5.2, whereas distances range from less than 1 to 600 km. The disseminated dataset is constituted of (1) a versioned flatfile containing the metadata and main intensity measures computed on each processed record, (2) time histories, and (3) response spectra for several damping values and Fourier spectra.
    Print ISSN: 0895-0695
    Electronic ISSN: 1938-2057
    Topics: Geosciences
    Published by Seismological Society of America
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  • 3
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    Influence of Source, Path, and Site Effects on the Magnitude Dependence of Ground‐Motion Decay with Distance (2015)
    Seismological Society of America
    Details
    Publication Date: 2015-12-02
    Print ISSN: 0895-0695
    Electronic ISSN: 1938-2057
    Topics: Geosciences
    Published by Seismological Society of America
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  • 4
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    Generic-To-Reference Rock Scaling Factors for Seismic Ground Motion in Italy (2023)
    Seismological Society of America
    Details
    Publication Date: 2023-01-27
    Description: In this article, we apply the reference-rock identification method (RRIM; Lanzano et al., 2020) to the ITalian ACcelerometric Archive, which includes more than 1600 recording stations in Italy and in the neighboring countries, with different levels of site characterization. The RRIM is based on the identification and the evaluation of site parameters representing the reference site conditions (Steidl et al., 1996) and the construction of the scoring scheme to classify the candidate stations. Given the large number of sites, the preselection of can- didates is performed via residual analysis, selecting those characterized by flat site response and amplitude similar or lower than the one for the generic rock (average shear-wave veloc- ity in the uppermost 30 m, V S30 800 m= s). The main results of this study are: (1) a list of reference rock sites in Italy, with an associated score; (2) a scenario-independent generic-to- reference rock corrective factor for the ground-motion model for shallow active crustal events in Italy (ITA18; Lanzano, Luzi, et al., 2019); (3) a model for the generic-to-reference rockcorrectivefactor,parametrizedintermsofVS30 andκ0,thatis,thehigh-frequencydecay parameter (Anderson and Hough, 1984). A collateral product is a set of coefficients for the prediction of 81 ordinates of the Fourier amplitude spectra (FAS) in the frequency interval 0.1–30 Hz, calibrated with the same dataset and functional form of ITA18 for acceleration response spectra (SA). The application of RRIM allowed us to identify 116 stations with aver- age measured V S30 ∼ 900 m= s. The corrective factor allows to scale both SA and FAS spectra, and has a significant effect at high frequencies, reducing the ground motion by up to a factor 1.7 at f = 10 Hz. The introduction of κ0 in the corrective term modeling is effective from 2 Hz onward and results in a reduction of variability at high frequencies (f 〉 10 Hz).
    Description: Published
    Description: 1583–1606
    Description: 5T. Sismologia, geofisica e geologia per l'ingegneria sismica
    Description: 6T. Studi di pericolosità sismica e da maremoto
    Description: JCR Journal
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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