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D'Amico M.,Italian National Institute of Geophysics and Volcanology | Puglia R.,Italian National Institute of Geophysics and Volcanology | Russo E.,Centro Nazionale Terremoti | Maini C.,Cdm Smith | And 2 more authors.
Bulletin of Earthquake Engineering | Year: 2016

We present a web-repository (SYNTHESIS 0.2, SYNTHEtic SeISmograms database) designed to archive and distribute synthetic waveforms computed by physic-based models. The structure of the database derives from the ITalian ACcelerometric Archive (ITACA Working Group in ITalian ACcelerometric Archive, version 2.1, 2016. doi:10.13127/ITACA/2.1), devoted to archive and distribute recorded strong motion data. To date, SYNTHESIS includes more than 4500 simulated accelerograms associated to earthquake scenarios of either occurred events or possible future events. The database also includes information about kinematic rupture models and propagation medium related to the synthetic waveforms. The main features of the SYNTHESIS web-portal for dissemination of synthetics are here illustrated. A wide range of key fields enables the user to interactively retrieve simulated waveforms, modeling parameters and information on simulation sites. A range of display options allows users to view data in different frameworks, to extract and download synthetic waveforms and to display maps of selected peak ground motion parameters. SYNTHESIS is a prototype designed to fulfill specific needs of two Italian projects, and developed with the aim of promoting the use of simulated waveforms for hazard analysis. Ground motion simulations can be employed in a variety of applications, such as: (1) to evaluate shaking scenarios for seismic risk mitigation; (2) to define seismic inputs for site response or structural response analyses; (3) to integrate observed data for the calibration of ground motion prediction equations and (4) to evaluate the different components of the ground motion variability. © 2016 Springer Science+Business Media Dordrecht

Balzanella A.,The Second University of Naples | Adelfio G.,University of Palermo | Chiodi M.,University of Palermo | D'Alessandro A.,Centro Nazionale Terremoti | Luzio D.,University of Palermo
Studies in Classification, Data Analysis, and Knowledge Organization | Year: 2014

This paper introduces a new technique for clustering seismic events based on processing, in time-frequency domain, the waveforms recorded by seismographs. The detection of clusters of waveforms is performed by a k-means like algorithm which analyzes, at each iteration, the time-frequency content of the signals in order to optimally remove the non discriminant components which should compromise the grouping of waveforms. This step is followed by the allocation and by the computation of the cluster centroids on the basis of the filtered signals. The effectiveness of the method is shown on a real dataset of seismic waveforms. © Springer International Publishing Switzerland 2014.

Ferranti L.,University of Naples Federico II | Antonioli F.,ENEA | Anzidei M.,Centro Nazionale Terremoti | Anzidei M.,University Cosenza | And 2 more authors.
Journal of the Virtual Explorer | Year: 2010

Vertical tectonic displacements in Italy since 125 to 1 Kyr BP are drawn from relative sea-level (RSL) history studies at coastal sites, and, together with instrumental observations, allow to bridge the gap with events recorded in the geologic (1 Ma) archive. Our analysis aims at establishing the appropriate spatial extent, rate and duration of vertical tectonic motion within individual crustal segments, and at placing constraints on the contribution to displacements coming from regional (deep) and local (shallow-crustal) sources. The central and northern Tyrrhenian Sea and the Ligurian Sea margins show stability at all scales, except for subsidence in coastal basins and uplift, at places high, at volcanic centers. On the contrary, sustained, large magnitude uplift of Calabria embeds a deep-seated contribution, highlighted by the spatial coincidence of the uplifting province with a lithospheric slab, and a contribution from local faults and folds. Holocene uplift was up larger than since Middle-Late Pleistocene, with rate changes tuned among all sites. The recent increase in uplift rate, detected also in the instrumental record, is related to clustering of strain release, possibly triggered by isostatic response to deglaciation. A weak deformation signal is recorded on the central Adriatic coastline, and records slow Apennines thrust belt migration. In the northern Adriatic Sea, vertical tectonic motions result from opposite displacements in the southern Alps, internal Dinarids and northern Apennines, but flexure of the Adriatic (micro-) plate beneath the Northern Apennines is the dominating contributor. Here, rate and spatial extent of displacements are steady over different time-scales, suggesting prevailing control exercised by plate dynamics.

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