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  • 1
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    In:  Journal of Earthquake Engineering, Washington, D.C., American Geophysical Union, vol. 7, no. 4, pp. 599-614, pp. L08304, (ISSN: 1340-4202)
    Publication Date: 2003
    Keywords: Site amplification ; Earthquake ; Earthquake engineering, engineering seismology ; JEE ; SPAROLAI ; SRICHWALSKI
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  • 2
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    In:  Geophys. Res. Lett., Philadelphia, 4, vol. 32, no. 1, pp. 1096-1108, pp. L01303, (ISSN: 1340-4202)
    Publication Date: 2005
    Keywords: Shear waves ; Velocity depth profile ; Site amplification ; NOISE ; Micro-tremor (seismic noise) ; Horizontal to vertical spectral ratio ; Nakamura ; Inversion ; Dispersion ; micro-zonation ; GRL ; 0902 ; Exploration ; Geophysics: ; Computational ; methods: ; seismic ; 7212 ; Seismology: ; Earthquake ; ground ; motions ; and ; engineering ; seismology ; 7223 ; Earthquake ; interaction, ; forecasting, ; and ; prediction ; (1217, ; 1242) ; 7255 ; Seismology: ; Surface ; waves ; and ; free ; oscillations ; SPAROLAI ; SRICHWALSKI
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  • 3
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    In:  Geophys. Res. Lett., Darmstadt, Wissenschaftliche Buchgesellschaft, vol. 32, no. 11, pp. 2023, pp. L11308, (ISSN: 1340-4202)
    Publication Date: 2005
    Description: A joint inversion of phase velocity and H/V ratio curves, both obtained from seismic-noise recordings, permits the retrieval of the shear-wave velocity structure of local sedimentary cover. Our inversion scheme uses a genetic algorithm and considers the influence of higher modes on the data sets. Encouraged by the results published previously on joint inversion (Parolai et al., 2005) we went one step further. We found, using a synthetic data set, that the impedance contrast at the sediment-bedrock interface has a strong influence on the shape of the H/V ratio curve, which therefore allows the bedrock S-wave velocity to be well constrained in the joint-inversion procedure. Our observations were further confirmed using a real data set.
    Keywords: Site amplification ; Horizontal to vertical spectral ratio ; Dispersion ; Micro-tremor (seismic noise) ; Shear waves ; Velocity ; Velocity depth profile ; GRL ; 0902 ; Exploration ; Geophysics: ; Computational ; methods: ; seismic ; 7212 ; Seismology: ; Earthquake ; ground ; motions ; and ; engineering ; seismology ; 7255 ; Surface ; waves ; and ; free ; oscillations
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  • 4
    Publication Date: 2015-10-11
    Description: Earthquake Early Warning Systems (EEWS) are potentially effective tools for risk mitigation in active seismic regions. The present study explores the possibility of predicting the macroseismic intensity within EEW timeframes using the squared velocity integral (IV2) measured on the early P-wave signals, a proxy for the P-wave radiated energy of earthquakes. This study shows that IV2 correlates better than the peak displacement measured on P-waves (PD) with both the peak ground velocity and the Housner Intensity, with the latter being recognized by engineers as a reliable proxy for damage assessment. Therefore, using the strong motion recordings of the ITalian ACcelerometric Archive (ITACA 2.0), a novel relationship between the parameter IV2 and the macroseismic intensity (IM) has been derived. The validity of this relationship has been assessed using the strong motion recordings of the INGV Strong Motion Data and ‘ Osservatorio Sismico delle Strutture ’ databases, as well as, in the case of the M W 6 May 29 th 2012 Emilia Earthquake (Italy), comparing the predicted intensities with the ones observed after a macroseismic survey. Our results indicate that P-wave IV2 can become a key parameter for the design of on-site EEWS, capable of proving real-time predictions of the IM at target sites.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 5
    Publication Date: 2015-02-11
    Description: When accompanied by appropriate training and preparedness of a population, Earthquake Early Warning Systems (EEWS) are effective and viable tools for the real-time reduction of societal exposure to seismic events in metropolitan areas. The Italian Accelerometric Network, RAN, which consists of about five hundred stations installed over all the active seismic zones, as well as many cities and strategic infrastructures in Italy, has the potential to serve as a nation-wide early warning system. In this work, we present a feasibility study for a nation-wide EEWS in Italy obtained by the integration of the RAN and the software platform PRESTo (Satriano et al., 2011). The performance of the RAN-PRESTo EEWS is first assessed by testing it on real strong motion recordings of forty of the largest earthquakes that have occurred during the last ten years in Italy. Furthermore, we extend the analysis to regions that did not experience earthquakes by considering a nation-wide grid of synthetic sources capable of generating Gutenberg-Richter sequences corresponding to the one adopted by the seismic hazard map of the Italian territory. Our results indicate that the RAN-PRESTo EEWS could theoretically provide for higher seismic hazard areas reliable alert messages within about 5 to 10 seconds and maximum lead-times of about 25 seconds. In case of large events (M 〉 6.5), this amount of lead-time would be sufficient for taking basic protective measures (e.g. duck and cover, move away from windows or equipment) in tens to hundreds municipalities affected by large ground shaking.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 6
    Publication Date: 2014-06-04
    Description: Article Being able to predict the final size of an earthquake while rupture is ongoing is a largely debated scientific problem. Here, the authors suggest that the evolution of P-wave peak displacement holds information regarding the early stage of the rupture process and may be a proxy for the final size of the event. Nature Communications doi: 10.1038/ncomms4958 Authors: S. Colombelli, A. Zollo, G. Festa, M. Picozzi
    Electronic ISSN: 2041-1723
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General , Physics
    Published by Springer Nature
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  • 7
    Publication Date: 2017-02-11
    Description: An Earthquake Early Warning (EEW) system is a real-time seismic monitoring infrastructure that has the capability to provide warnings to target cities before the arrival of the strongest shaking waves. In order to provide a rapid alert when targets are very close to the epicenter of the events, we developed an on-site EEW approach and evaluated its performance at the Italian national scale. The system is a P-wave based method that measures in real-time two parameters: the initial Peak Displacement ( Pd ) and the average period ( τ c ). As output, the system provides the predicted ground shaking intensity at the monitored site, the alert level and a qualitative classification of both earthquake magnitude and source-to-receiver distance. We applied the on-site EEW methodology to a dataset of Italian earthquakes, with magnitude ranging from 3.8 to 6, and evaluated the performance of the system in terms of correct warning and lead-times (i.e., time available for security actions at the target). The results of this retrospective analysis show that, for the large majority of the analyzed cases, the method is able to deliver a correct warning shortly after the P-wave detection, with more than 80% of successful intensity predictions at the target site. The lead-times increase with distance, with a value of 8-10 seconds at 50 km and 15-18 seconds at 100 km.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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