Abstract
This paper is a reappraisal of the study on the single-station sigma for Italian strong-motion stations carried out by Luzi et al. (Bull Seismol Soc Am 104:467–483, 2014). A residual analysis considering the time interval 1972–2015 is carried out on two datasets, using 4.0 and 3.5 as magnitude thresholds, and the ground motion prediction equations by Bindi et al. (Bull Earthq Eng 9:1899–1920, 2011) as reference model for the calculations of the expected median intensity measures. The magnitude threshold of 3.5 is selected with the aim of obtain the largest number of records for each station and evaluate the influence of low magnitude events on the standard deviation of the residual components. The dataset contains about 8400 waveforms, relative to 522 events, recorded by 600 strong-motion stations, about five times the stations considered in Luzi et al. (2014). We also discuss elements that can influence the variability at individual station, as the number of records, the presence of analog waveforms and records from multiple source-to-site paths. For each station, the event-corrected single-station standard deviation for an individual site, ϕ ss,s , and the site-term, δS2S s , have been provided. The results of this study can be used as input for the site-specific probabilistic seismic hazard assessment in Italy, removing the ergodic assumption.
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Acknowledgments
This work has been carried out in the framework of DPC-INGV S2 project (Constraining Observations into Seismic Hazard, sites.google.com/site/ingvdpc2014progettos2/home). The Authors wish to thank the Guest Editors (Laura Peruzza and Francesca Pacor) and the manuscript Reviewers (Adrien Oth and an anonymous reviewer) for the helpful comments which improved the quality of our paper. This paper does not necessarily represent DPC official opinion and policies.
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Esupp 1
Site-term δS2S s (ln units) for the strong-motion stations in DBS2_3.5 (TXT 94 kb)
Esupp 2
Event-corrected single-station standard deviation ϕ ss,s (ln units) for the strong-motion stations in DBS2_3.5 (TXT 89 kb)
Esupp 3
Figures of the spatial distribution and within-event residuals versus period of the events recorded by selected strong-motion stations (§4.3 and §5) (PDF 17056 kb)
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Lanzano, G., D’Amico, M., Felicetta, C. et al. Update of the single-station sigma analysis for the Italian strong-motion stations. Bull Earthquake Eng 15, 2411–2428 (2017). https://doi.org/10.1007/s10518-016-9972-x
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DOI: https://doi.org/10.1007/s10518-016-9972-x