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ABSTRACT: Urban and peri-urban areas are increasingly called to face with the problem of an increased frequency of flooding events. One of the major issue is the evolving climate conditions. The current paper aims to investigate the temporal changes occurring in extreme rainfall within the Solofrana river basin (Southern Italy), is an about 200 Km2 peri-urban catchment, where flooding and landslides events occurred rather frequently, especially during the last years. Five rain-gauge stations data sub-hourly, hourly and daily rainfall data have been tested for temporal trend detection. Rainfall heights, compared to maximum annual average for different duration, increase on average of about 5-10% (on a ten year base) and, for a particular rain gauge station, up to 40%. The trends appear however significant only for two of the rain gauges, in particular for the two station located on the main relief of the investigated watershed.Procedia Engineering 12/2015; 119(1):1129-1138. DOI:10.1016/j.proeng.2015.08.957
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ABSTRACT: The current paper aims to investigate the risk of occurrence of damaging events, as a function of rainfall triggering event types, for the Solofrana peri-urban basin, where MDHEs has occurred rather frequently, especially during the last decade. A number of about 25 MDHE, within the period 1951-2014, have been selected and analyzed for the purpose. Cumulate rainfall, duration extent, maximum intensity, return periods, temporal occurrences and spatial patterns have been analyzed for purposes of classification. Rainfall occurrences appeared effectively severe in only few cases and perhaps the large number of damaging event, and the relative increase in the last decade, is most likely caused by incorrect planning policies.Procedia Engineering 12/2015; 119(1):1139-1146. DOI:10.1016/j.proeng.2015.08.960
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ABSTRACT: This study performs a detailed reconstruction of the rupture mechanism of the 1980 Campania–Lucania (southern Italy) earthquake. This is achieved by relocation of the main event through computation of fault-plane solutions of the aftershocks, P-wave velocity inversion, and analysis of post-seismic ground deformation, which provide an overall picture of the faulting mechanism. All of these data are in favor of a complex rupture mechanism, as already identified by many studies, which consists of three separate events. The present study defines a graben-like rupture, with the first event rupturing a (>20-km-long) segment of a large, high-angle, NE-dipping, SE-NW-striking, normal fault. The two successive ruptures occurred separately, the first along the southern segment, and the second along the northern segment, of a complementary SW-dipping, normal fault. This mechanism is well evidenced by the revised location of the hypocenter of the main event, and the location of the aftershocks and their fault-plane solutions, as well as by the underlying three-dimensional P-wave velocity structure. The model proposed by Amoruso et al. [2005a] that was based on the inversion of co-seismic vertical displacement data is confirmed by the present analyses, as it satisfies all of the available experimental observations, and better constrains the location and fault-plane solutions of the aftershocks, the velocity discontinuities, and the rupture observations at the surface. This conclusion is also supported by analyses of the post-seismic data.Annals of geophysics = Annali di geofisica 05/2015; 54(6). DOI:10.4401/ag-4984
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