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Durante, F.
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- PublicationRestrictedA multidisciplinary approach to the seismic characterization of a mountain top (Monteluco, central Italy)This study provides a seismic characterization of the flat top area of Monteluco carbonate mountain using a multidisciplinary approach. Recordings of ambient vibrations and local earthquakes, geophysical and borehole data, detailed geological surveys and rock mass characterizations were used to investigate the ground-motion amplification observed on the flat top of Monteluco. Weak motion measurements carried out on the top area gave resonance frequency (f0) in the range of 2–4 Hz, likely due to the occurrence of fractured rocks, tens of meters thick. In this frequency range and in the same target area, it was also possible to observe a nearly NW-SE polarization of the seismic signal, which we have tentatively correlated with the main mapped fault systems. Nevertheless, a topographic effect on noise polarization cannot be excluded.
126 5 - PublicationOpen AccessSeismic noise measurements along the slope of the L'Aquila terrace(2013-09-16)
; ; ; ; ; ; ; ; ;Di Giulio, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Amoroso, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Di Naccio, D.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Vassallo, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Durante, F.; Università dell'Aquila ;Gaudiosi, I.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Milana, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Tallini, M.; Università dell'Aquila; ; ; ; ; ; ; L'Aquila downtown (Central Italy) suffered strong damages during the April 6th 2009 Mw 6.3 earthquake. In particular many collapses and strong damages on buildings have been observed near the southern edge of the L'Aquila downtown. L'Aquila is bounded southward by the Aterno river valley along a steep scarp. The downtown is settled on a calcareous terrace, mainly composed of a Pleistocene stiff calcareous breccia over-imposed to ancient lacustrine sediments. The upper portion of the L'Aquila breccia in the area of Via XX Settembre, which borders the southern edge of the top of the morphological terrace of L'Aquila downtown, is irregularly affected by the presence of residual soils known as "red soils" or filling material. The continental deposits are characterized by a velocity inversion at a depth ranging from few tens up to one hundred meters. We performed extensive ambient vibration measurements along the south-western slope of the L'Aquila terrace, where some RC structures without anti-seismic design were heavily damaged during the Mw 6.3 mainshock. Noise measurements were conducted along several sections starting from the top of the terrace toward the base of the Aterno river valley. The aim was to investigate the relationship between horizontal-to-vertical amplitude spectra ratio (H/V method) with the geological and geomorphological variations existing along the flanks of the L'Aquila terrace. We also performed noise measurements within some open underground caves that are present along the slope of the calcareous terrace. We integrate our geophysical data with the available geological, geotechnical and geophysical data, performed for the seismic microzonation and the reconstruction of the damaged buildings. We find that the resonance frequency is varying from about 0.6 to 1 Hz for sites at the top of terrace and in proximity of the Aterno river valley, respectively. Larger amplitude of the resonance peak is observed at sites on the top of the terrace rather than the measurements performed at the base. Additionally, the H/V curves at the bottom of the L'Aquila terrace show an amplification in a broader frequency band. The variation in the H/V shapes, moving along the flanks of the L'Aquila terrace, is mainly related to a different behavior of the vertical component. Indeed the vertical recordings show a spectral minimum shifted at higher frequency for measurements nearby the Aterno river.364 289 - PublicationRestrictedGeological reconstruction in the area of maximum co-seismic subsidence during the 2009 Mw=6.1 L’Aquila earthquake using geophysical analyses and borehole stratigraphy.(2016-06)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;Porreca, M.; Dipartimento di Fisica e Geologia, Università di Perugia ;Smedile, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Speranza, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Mochales, T.; Instituto Geológico y Minero de España, Madrid, España ;D'Ajello Caracciolo, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Di Giulio, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Vassallo, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Villani, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Nicolosi, I.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Carluccio, R.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Amoroso, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Macrì, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Buratti, N.; Total SA, CSTJF, Pau, France ;Durante, F.; Dipartimento di Ingegneria Civile Edile-Architettura e Ambientale, Università dell’Aquila ;Tallini, M.; Dipartimento di Ingegneria Civile Edile-Architettura e Ambientale, Università dell’Aquila ;Sagnotti, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; ; ; ; ; ; ; ; ; ; ; ; ; ; ; InSAR images showed that the 2009 Mw=6.1 normal faulting L'Aquila earthquake (Abruzzi region, central Italy) produced a maximum co-seismic subsidence of ca. 24 cm in the epicentral area. We report new results about the stratigraphic architecture of this area by means of the integration of geophysical and stratigraphic data from a new 151 m deep borehole. According to the indication of preliminary geophysical (electrical resistivity tomography and seismic noise) surveys, the borehole was drilled where maximum thicknesses of fine-grained sediments were expected. The geophysical results were also useful to estimate the basin substrate depth and to define the geometry of the continental deposits, successively constrained by the core stratigraphy. The core is characterized by two sequences separated by an erosional discontinuity. The upper sequence is composed by silty, sandy and gravelly deposits, mainly characterized by high values of electrical resistivity. The lower sequence is characterized by prevalence of grey clayey silt and sandy sediments, with low values of resistivity. Based on correlations among the stratigraphic core and outcrop data of the Aterno Valley, we interpret the upper sequence as related to fluvial-alluvial depositional environment during Middle Pleistocene-Holocene, whereas the lower sequence is related to deposition in a prevalent marshy floodplain environment during Early Pleistocene.719 25