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  • 1
    Electronic Resource
    Electronic Resource
    2d and 3D elastic wave propagation by a pseudo-spectral domain decomposition method (1997)
    Springer
    Journal of seismology 1 (1997), S. 237-251 
    Details
    ISSN: 1573-157X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract A new numerical method is presented for propagating elastic waves in heterogeneous earth media, based on spectral approximations of the wavefield combined with domain decomposition techniques. The flexibility of finite element techniques in dealing with irregular geologic structures is preserved, together with the high accuracy of spectral methods. High computational efficiency can be achieved especially in 3D calculations, where the commonly used finite-difference approaches are limited both in the frequency range and in handling strongly irregular geometries. The treatment of the seismic source, introduced via a moment tensor distribution, is thoroughly discussed together with the aspects associated with its numerical implementation. The numerical results of the present method are successfully compared with analytical and numerical solutions, both in 2D and 3D.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009758820546
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    Paper (German National Licenses)
    Fulltext
  • 2
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    CMS Resistive Plate Chamber overview, from the present system to the upgrade phase I (2013)
    Institute of Physics Publishing (IOP)
    Details
    Publication Date: 2013-04-09
    Description: Resistive Plate Chambers have been chosen as dedicated trigger muon detector for the Compact Muon Solenoid experiment [1] at the Large Hadron Collider [2] at CERN. The system consists of about 3000 m 2 of double gap RPC chambers placed in both the barrel and endcap muon regions. About 5.6 fb −1 (2010–2011) of proton-proton collision data have been used to study the performance of the RPC detector and trigger. A full high voltage scan of all the RPC chambers has been done at beginning of 2011 data taking to evaluate the working point chamber by chamber and to eventually spot aging effects. The excellent behaviour of the RPC detector can be summarized with an average detector efficiency of about 97%, an average cluster size of 1.8 and an intrinsic noise rate of 0.1 Hz/cm 2 . This is a clear fulfilment of all the requirements decided 18 years ago in the CMS TDR document [3].
    Electronic ISSN: 1748-0221
    Topics: Physics
    Published by Institute of Physics Publishing (IOP)
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  • 3
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    Evaluation of Probabilistic Site-Specific Seismic-Hazard Methods and Associated Uncertainties, with Applications in the Po Plain, Northern Italy (2015)
    Seismological Society of America (SSA)
    Details
    Publication Date: 2015-10-02
    Description: Site-specific ground-motion hazard, as assessed by a probabilistic seismic-hazard analysis one-step approach that handles a single-site sigma and its uncertainties and uses a simple logic tree, is compared with a two-step approach that includes bedrock motion evaluation and wave propagation through a local soil profile with consideration of the main epistemic uncertainties. The one-step analysis relies on accelerometer data from the Po Plain, a sedimentary basin in northern Italy where an earthquake sequence with two M w ~6.0 events was extensively recorded in 2012. Uniform hazard spectra (UHS) on soil and exposed bedrock are evaluated at three deep-soil accelerometer sites (MRN, NVL, and T0821), using residual measures available from other studies, by which uncertainties in site terms ( S 2 S ) and single-site sigma ( ss , s ) are estimated. Despite similarity in geologic conditions, at least one out of three sites in the one-step analysis displays substantial differences in mean level (T0821) or in the (84–16) percentile spread (NVL), depending on differences in site terms and single-site sigma, possibly caused by source-to-site propagation effects. The two-step approach was applied to the remaining site (MRN) using carefully selected and broadband-matched acceleration signals and linear, equivalent-linear, and nonlinear approaches as excitation in propagation analyses. We found that assumptions on soil degradation curves dominate the variability of results. The linear approach provided the best results, based on (1) the similarity of the one-step nonergodic UHS with the two-step result based on the linear approach; (2) the comparison with observed records at MRN during the 2012 sequence mainshocks, showing peak ground acceleration and short-period spectral levels well beyond those predicted by different nonlinear assumptions; and (3) similar evidence from a set of 21 stations at deep soil sites of the Japanese KiK-net.
    Print ISSN: 0037-1106
    Electronic ISSN: 1943-3573
    Topics: Geosciences , Physics
    Published by Seismological Society of America (SSA)
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  • 4
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    Anatomy of strong ground motion: near-source records and three-dimensional physics-based numerical simulations of the Mw 6.0 2012 May 29 Po Plain earthquake, Italy (2015)
    Oxford University Press
    Details
    Publication Date: 2015-11-05
    Description: Stimulated by the recent advances in computational tools for the simulation of seismic wave propagation problems in realistic geological configurations, this paper presents a 3D physics-based numerical analysis of near-source ground motion during the M W 6.0 2012 May 29 earthquake in the Po Plain, Northern Italy. To reproduce with sufficient accuracy some of the most peculiar features of the near-source strong-motion records and of the spatial variability of damage distribution, this study required a sequence of investigations, starting from the analysis of a wide set of near-source records, to the calibration of an improved kinematic seismic source model, up to the development of a 3D numerical model of the portion of the Po Plain interested by the earthquake. The latter includes the basin geometry, characterized by sediment thickness sharply varying from few tens of metres to some kilometres. The spatial resolution of the numerical model is suitable to propagate frequencies up to about 1.5 Hz. Numerical simulations were performed using the open-source high-performance code SPEED, based on the Discontinuous Galerkin Spectral Elements method. The 3D numerical model, coupled with the updated slip distribution along the rupturing fault, proved successful to reproduce with good agreement, measured through quantitative goodness-of-fit criteria, the most relevant features of the observed ground motion. These include: (i) the large fault normal velocity peaks at the near-source stations driven by updip directivity effects; (ii) the small-scale variability at short distance from the source, resulting in the out-of-phase motion at stations separated by only 3 km distance; (iii) the propagation of prominent trains of surface waves, especially in the Northern direction; (iv) the map of earthquake-induced ground uplift with maximum values of about 10 cm, in substantial agreement with geodetic measurements and (v) the two-lobed pattern of the peak ground velocity map, well correlated with the distribution of macroseismic intensity.
    Keywords: Seismology
    Print ISSN: 0956-540X
    Electronic ISSN: 1365-246X
    Topics: Geosciences
    Published by Oxford University Press on behalf of The Deutsche Geophysikalische Gesellschaft (DGG) and the Royal Astronomical Society (RAS).
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  • 5
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    Engineering ground motion record selection in the ITalian ACcelerometric Archive (2012)
    Elsevier
    Details
    Publication Date: 2021-06-21
    Description: This paper introduces REXELite, an internet version of REXEL, a software for automatic selection of ground motion suites for nonlinear dynamic analysis of structures. REXELite was developed with the aim of integrating an advanced earthquake records’ repository, such as the ITalianACcelerometricArchive (ITACA), with a tool to define seismic input for engineering seismic analysis according to international standards (with priority to Europe). In fact, REXELite allows to define target design spectra according either to Eurocode 8 or to the Italian building code, and to search ITACA for suitable sets of seven records (comprised of one or two horizontal ground motion components) matching such target spectra: on average, in a user-specified period range, and with the desired tolerance. The records in the set also have, individually and according to some criteria, the most similar spectral shape with respect to that of the code. Selection options include magnitude, source-to-site distance, soil conditions and, if desired, linear scaling of records to reduce further record-to-record variability of the selected suite.This paper introduces REXELite, an internet version of REXEL, a software for automatic selection of ground motion suites for nonlinear dynamic analysis of structures. REXELite was developed with the aim of integrating an advanced earthquake records’ repository, such as the ITalianACcelerometricArchive (ITACA), with a tool to define seismic input for engineering seismic analysis according to international standards (with priority to Europe). In fact, REXELite allows to define target design spectra according either to Eurocode 8 or to the Italian building code, and to search ITACA for suitable sets of seven records (comprised of one or two horizontal ground motion components) matching such target spectra: on average, in a user-specified period range, and with the desired tolerance. The records in the set also have, individually and according to some criteria, the most similar spectral shape with respect to that of the code. Selection options include magnitude, source-to-site distance, soil conditions and, if desired, linear scaling of records to reduce further record-to-record variability of the selected suite.
    Description: Published
    Description: 1761-1778
    Description: 4.1. Metodologie sismologiche per l'ingegneria sismica
    Description: JCR Journal
    Description: reserved
    Keywords: Response spectrum matching ; ITACA ; 04. Solid Earth::04.06. Seismology::04.06.11. Seismic risk
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 6
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    Caratteristiche geologiche e classificazione di sito delle stazioni accelerometriche della RAN ubicate a L'Aquila (2010)
    Details
    Publication Date: 2020-10-26
    Description: L’evento sismico del 6 aprile 2009 è stato registrato da 57 stazioni accelerometriche delle RAN (Rete Accelerometrica Nazionale, gestita dal Dipartimento della Protezione Civile), alcune delle quali ubicate nella città di L’Aquila (stazione AQK) o nella porzione della Valle dell’Aterno a NW della città (AQA, AQF, AQG, AQM, AQP, AQV). Uno degli obiettivi del Progetto S4, finanziato nell’ambito della Convenzione 2007‐ 2009 tra l’Istituto Nazionale di Geofisica e il Dipartimento della Protezione Civile, consiste nella classificazione dei siti di ubicazione delle postazioni accelerometriche utilizzando le categorie di sottosuolo previste nell’EC8‐NTC2008. Nell’ambito del Task 2 è stata rilasciata una versione preliminare di tale classificazione (vers. 1.0), ottenuta soltanto su base litologica, utilizzando una mappa prodotta dall’INGV in un precedente progetto sismologico (Progetto S6 della Convenzione DPC‐INGV 2005‐ 2007). Questa mappa litologica deriva dalla Carta Geologica d’Italia in scala 1:100.000, mediante l’accorpamento in classi delle Formazioni Geologiche secondo un criterio litologico e di età del deposito. Alle varie classi litologiche ottenute è stata quindi attribuita una delle cinque categorie di sottosuolo (A, B, C, D, E) dell’EC8‐ NTC2008. Per le stazioni per le quali sono disponibili i profili di velocità delle onde di taglio VS, la categoria di sottosuolo è stata eventualmente corretta, scegliendo la classificazione ottenuta dal profilo di velocità delle onde di taglio nei primi 30 metri. Nei giorni successivi all’evento del 6 aprile 2009, i ricercatori dell’UR2 e dell’UR6 del Progetto S4, impegnati nel Task 2, hanno effettuato sopralluoghi finalizzati alla verifica della localizzazione geografica, delle condizioni morfologiche e geologiche locali di alcune stazioni di registrazione ubicate nell’area aquilana. Sulla base delle informazioni raccolte e dei dati acquisiti, è stata prodotta una versione aggiornata (vers. 1.1) della classificazione di sito per le suddette stazioni, attualmente disponibile sul sito web del Progetto S4 (http://esse4.mi.ingv.it).
    Description: Progetto DPC-INGV S4: "Banca dati accelerometrica"
    Description: Published
    Description: 4.1. Metodologie sismologiche per l'ingegneria sismica
    Description: open
    Keywords: Accelerometric stations ; L'Aquila earthquake ; Site classification ; 04. Solid Earth::04.06. Seismology::04.06.04. Ground motion ; 04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring ; 04. Solid Earth::04.06. Seismology::04.06.10. Instruments and techniques ; 04. Solid Earth::04.06. Seismology::04.06.11. Seismic risk
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: report
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  • 7
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    ITACA: Italian Accelerometric Archive (2010)
    Details
    Publication Date: 2017-04-03
    Description: ITACA is the Italian strong motion database. It contains more than 2000 three component waveforms generated by about 1000 earthquakes from 1972 to 2009. Strong motion data come mainly from National Accelerometric Network, operated by Dipartimento della Protezione Civile - DPC. Corrected and uncorrected time-series as well as spectral data can be downloaded in ASCII format. ITACA interfaces allow to set parameters of interest and retrieve specific events, stations, waveforms and their metadata.
    Description: Dipartimento della Protezione Civile
    Description: Published
    Description: 5.2. TTC - Banche dati di sismologia strumentale
    Description: open
    Keywords: Italian strong motion data ; database ; 05. General::05.02. Data dissemination::05.02.02. Seismological data
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: web product
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  • 8
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    Caratteristiche dei dati accelerometrici registrati durante la sequenza sismica aquilana (2010)
    IUSS Press
    Details
    Publication Date: 2012-02-03
    Description: I dati accelerometrici relativi alla sequenza sismica de L’Aquila, iniziata con l’evento del 6 Aprile alle ore 1.32 (MW 6.3), provengono dalla rete Rete Accelerometrica Nazionale (RAN), gestita dal Dipartimento della Protezione Civile (DPC) e da una rete temporanea installata il giorno dopo la scossa principale ad opera dell’Istituto Nazionale di Geofisica e Vulcanologia (INGV MI-PV). I dati del DPC sono scaricabili dalla banca dati accelerometrica italiana ITACA (http://itaca.mi.ingv.it), mentre quelli dell'INGV sono accessibili dal sito Internet http://accel.mi.ingv.it/statiche/ABRUZZO-2009/main.html. Il terremoto de L’Aquila è il terzo evento più forte che abbia prodotto registrazioni accelerometriche in Italia, dopo i terremoti dell’Irpinia (1980, MW 6.9) e del Friuli (1976, MW 6.4). Questo evento, insieme alle 12 repliche più forti (MW 〉 4.0) ha fornito un insieme di dati accelerometrici unico in Italia, in particolare per la presenza di un numero consistente di registrazioni in zona epicentrale ("campo vicino"). Il data set è composto da circa 300 accelerogrammi digitali (di cui 270 provenienti dalla RAN), con un ottimo rapporto segnale/rumore, registrati da circa 70 stazioni, installate in varie condizioni di sito, a distanze comprese fra 0 e 300 km. L'importanza di questo data set, non solo a livello nazionale, è legato al contributo significativo che fornisce nel colmare una lacuna nella distribuzione magnitudo-distanza dei dati strong motion italiani e mondiali, soprattutto per quanto riguarda gli eventi con meccanismo di faglia normale (Ameri et al.; 2009). I dati registrati in campo vicino provengono da un transetto composto da 6 stazioni installato dalla Protezione Civile nel 2001 nella Alta Valle dell’Aterno, con lo scopo di investigare la variabilità del moto sismico rispetto alle condizioni geologiche locali, dalla stazione AQK, installata in prossimità del centro urbano e da una stazione (AQU) appartenente alla rete broad band Mednet (http://mednet.rm.ingv.it/data.php), situata nel castello de L’Aquila. Queste stazioni distano meno di 5 km dall’epicentro dell’evento principale, ricadendo all’interno della proiezione superficiale del piano di rottura. A queste si aggiungono le registrazioni delle repliche, ottenute dalle stazioni della rete temporanea INGV, installata in area epicentrale. In questo lavoro si presenta un resoconto delle principali caratteristiche dello scuotimento del suolo verificatosi durante la sequenza sismica aquilana, attraverso l’analisi dei dati accelerometrici relativi alla scossa principale e alle due repliche più forti. Si discutono in particolare la dipendenza di diversi parametri strong motion dalla distanza, dall’azimuth e dalle condizioni di sito, e l'effetto delle caratteristiche del moto in campo vicino sulla risposta strutturale
    Description: Published
    Description: 57-68
    Description: 4.1. Metodologie sismologiche per l'ingegneria sismica
    Description: N/A or not JCR
    Description: reserved
    Keywords: strong motion data ; 2009 L'Aquila earthquake ; 04. Solid Earth::04.06. Seismology::04.06.04. Ground motion
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 9
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    The 6 April 2009, Mw 6.3, L’Aquila (Central Italy) earthquake: strong-motion observations (2009)
    Seismological Society of America
    Details
    Publication Date: 2017-04-04
    Description: On 6 April 2009, 01:32:40 UTC, an Mw 6.3 earthquake occurred in the Abruzzo region (central Italy), close to L’Aquila, a town of 68,500 inhabitants. About 300 people died because of the collapse of many residential and public build¬ings, and damage was widespread in L’Aquila and its neighbor¬ing municipalities. The earthquake occurred at 9.5 km depth along a NW-SW normal fault with SW dip, located below the city of L’Aquila (Istituto Nazionale di Geofisica e Vulcanologia [INGV] 2009a). The maximum observed intensity is IX–X in the MCS scale and the most relevant damages are distributed in the NW-SE direc¬tion, with evident predominance toward the southeast (Istituto Nazionale di Geofisica e Vulcanologia 2009b). This event rep¬resents the third largest earthquake recorded by strong-motion instruments in Italy, after the 1980 Mw 6.9 Irpinia and the 1976 Mw 6.4 Friuli earthquakes (Luzi et al. 2008). The mainshock was followed by seven aftershocks of moment magnitude larger than or equal to 5, the two stron¬gest of which occurred on April 7 (Mw = 5.6) and April 9 (Mw = 5.4). The mainshock and its aftershocks have been recorded by several digital stations of the Italian strong-motion network (Rete Accelerometrica Nazionale, R AN), operated by the Italian Department of Civil Protection (DPC); by the Italian seismometric network (Rete Sismometrica Nazionale, operated by INGV-Centro Nazionale Terremoti (CNT); http://cnt. rm.ingv.it); and by a temporary strong-motion array installed by the INGV Sezione di Milano-Pavia (MI-PV; http://www. mi.ingv.it). A total of 56 three-component strong-motion record¬ings were obtained within 280 km for the mainshock, with 23 being within 100 km of the epicenter. Horizontal peak ground motions in the near-fault region range from 327 to 646 cm/sec2, the latter representing one of the highest values recorded in Italy. This strong-motion data set, consisting of 954 waveforms from Mw 〉 4.0 events, is unique in Italy because it is entirely digital and includes observations from near-fault dis¬tances to some hundred kilometers away. The data set has been integrated in the new Italian strong-motion database ITACA (ITalian ACcelerometric Archive), available at http://itaca. mi.ingv.it. This paper provides an overview of the strong-motion recordings of the mainshock and the two strongest aftershocks with preliminary analyses of different strong-motion param¬eters as a function of distance, azimuth, and site conditions.
    Description: Published
    Description: 951-966
    Description: 4.1. Metodologie sismologiche per l'ingegneria sismica
    Description: JCR Journal
    Description: open
    Keywords: L'Aquila ; strong-motion ; 04. Solid Earth::04.06. Seismology::04.06.04. Ground motion
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 10
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    Italian strong motion records in ITACA: overview and record processing (2012)
    Springer Science
    Details
    Publication Date: 2017-04-04
    Description: The published version 1.0 of the new Italian strong-motion database ITACA (Italian ACcelerometric Archive, http://itaca.mi.ingv.it) includes to date (December 2010) about 4000 three-component waveforms up to M 6.9, from more than 1800 earthquakes up to 6.9, recorded by about 400 stations in the period 1972 – 2009. The uncorrected and corrected strong motion data are archived and can be retrieved with their metadata, concerning events, stations and waveforms. The aim of this paper is to present the procedures for processing the records included in ITACA, accounting for the heterogeneity of this data set, both in terms of quality and amplitude of records as well as illustrating the main features of the ITACA strongmotion dataset. Later, we focus on the “exceptional” ground-motion records, that we, conventionally, denote as those having peak acceleration and peak velocity larger than 300 cm/s2 and 15 cm/s, respectively. These records are less than 2% of the whole ITACA dataset but they are the most relevant for the seismic hazard and engineering implications. Such large peak values, recorded at distances up to 30km, are related not only to the strongest Italian earthquakes, but also to events with magnitude down to 4. Furthermore, we investigate the dependence of the largest peak values on horizontal and vertical directions and on source-to-site distance.
    Description: Published
    Description: 1741-1759
    Description: 5.2. TTC - Banche dati di sismologia strumentale
    Description: JCR Journal
    Description: reserved
    Keywords: ITACA ; record processing, exceptional data ; 05. General::05.02. Data dissemination::05.02.02. Seismological data
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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