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University of Palermo
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- PublicationOpen AccessOptimization of low-cost monitoring systems for on-site earthquake early-warning of critical infrastructures(Springer, 2020-07)
; ; ; ; ; ; ; ; ; In the last years, monitoring systems based on low-cost and miniaturized sensors (MEMS) revealed as a very successful compromise between the availability of data and their quality. Also applications in the field of seismic and structural monitoring have been constantly increasing in term of number and variety of functions. Among these applications, the implementation of systems for earthquake early warning is a cuttingedge topic, mainly for its relevance for the society as millions of peoples in various regions of the world are exposed to high seismic hazard. This paper introduces the optimization of an already established seismic (and structural) monitoring system, that would make it suitable for the implementation of the earthquake early warning. In particular, the sampling code has been improved and a new triggering algorithm able to automatically detect the ground shaking due to the propagation of the seismic waves has been developed. The preliminary results indicate that the system is very flexible and easy to implement, and encourage to perform further developing steps.55 140 - PublicationOpen AccessA new dissimilarity measure for clustering seismic signals(2011-09-06)
; ; ; ; ; ; ;Benvegna, Francesco; University of Palermo ;D'Alessandro, Antonino; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italia ;Lo Bosco, Giosuè; University of Palermo ;Luzio, Dario; University of Palermo ;Pinello, Luca; University of Palermo ;Tegolo, Domenico; University of Palermo; ; ; ; ; Hypocenter and focal mechanism of an earthquake can be determined by the analysis of signals, named waveforms, related to the wave field produced and recorded by a seismic network. Assuming that waveform similarity implies the similarity of focal parameters, the analysis of those signals characterized by very similar shapes can be used to give important details about the physical phenomena which have generated an earthquake. Recent works have shown the effectiveness of cross-correlation and/or cross-spectral dissimilarities to identify clusters of seismic events. In this work we propose a new dissimilarity measure between seismic signals whose reliability has been tested on real seismic data by computing external and internal validation indices on the obtained clustering. Results show its superior quality in terms of cluster homogeneity and computational time with respect to the largely adopted cross correlation dissimilarity.140 407 - PublicationOpen AccessBrief communication: Vehicle routing problem and UAV application in the post-earthquake scenario(2017)
; ; ; ; ; ;; ;; In this paper we simulate unmanned aerial vehicle (UAV) recognition after a possible case of diffuse damage after a seismic event in the town of Acireale (Sicily, Italy). Given a set of sites (84 relevant buildings) and the range of the UAV, we are able to find a number of vehicles to employ and the shortest survey path. The problem of finding the shortest survey path is an operational research problem called the vehicle routing problem (VRP). which has a solution that is known to be computationally time-consuming. We used the simulated annealing (SA) heuristic, which is able to provide stable solutions in a relatively short computing time.We also examined the distribution of the cost of the solutions varying the depot on a regular grid in order to find the best area for executing the survey.388 199