1,727,025 research outputs found
Slip distributions on active normal faults measured from LiDAR and field mapping of geomorphic offsets: an example from L'Aquila, Italy, and implications for modelling seismic moment release
Get PDFSurface slip distributions for an active normal fault in central Italy have been measured using terrestrial laser scanning (TLS), in order to assess the impact of changes in fault orientation and kinematics when modelling subsurface slip distributions that control seismic moment release. The southeastern segment of the surface trace of the Campo Felice active normal fault near the city of L'Aquila was mapped and surveyed using techniques from structural geology and using TLS to define the vertical and horizontal offsets of geomorphic slopes since the last glacial maximum (15 ± 3 ka). The fault geometry and kinematics measured from 43 sites and throw/heave measurements from geomorphic offsets seen on 250 scarp profiles were analysed using a modification of the Kostrov equations to calculate the magnitudes and directions of horizontal principal strain-rates. The map trace of the studied fault is linear, except where a prominent bend has formed to link across a former left-stepping relay-zone. The dip of the fault and slip direction are constant across the bend. Throw-rates since 15 ± 3 ka decrease linearly from the fault centre to the tip, except in the location of the prominent bend where higher throw rates are recorded. Vertical coseismic offsets for two palaeo earthquake ruptures seen as fresh strips of rock at the base of the bedrock scarp also increase within the prominent bend. The principal strain-rate, calculated by combining strike, dip, slip-direction and post 15 ± 3 ka throw rate, decreases linearly from the fault centre towards the tip; the strain-rate does not increase across the prominent fault bend. The above shows that changes in fault strike, whilst having no effect on the principal horizontal strain-rate, can produce local maxima in throw-rates during single earthquakes that persist over the timescale of multiple earthquakes (15 ± 3 ka). Detailed geomorphological and structural characterisation of active faults is therefore a critical requirement in order to properly define fault activity for the purpose of accurate seismic hazard assessment. We discuss the implications of modelling subsurface slip distributions for earthquake ruptures through inversion of GPS, InSAR and strong motion data using planar fault approximations, referring to recent examples on the nearby Paganica fault that ruptured in the Mw 6.3 2009 L'Aquila Earthquake
L'Aquila, città di piazze / L'Aquila, a city and its piazzas
No full textGenesi e formazione della città di L'Aquila attraverso la lettura dei suoi segni architetonici e urban
Atti del VII Convegno Nazionale di Storia e Fondamenti della Chimica L'Aquila, 8 - 11 ottobre 1997
No full textINGV - ISPRA joint Surface Faulting Database - Mw 6.1, 2009, April 6th L'Aquila earthquake (Central Italy)
No full textCoseismic surface faulting associated to the 6 April 2009, Mw 6.1 L'Aquila earthquake from the joint analysis of the Istituto Nazionale di Geofisica e Vulcanologia (INGV) and of the Istituto Superiore per la Protezione e la Ricerca Ambientale (ISPRA) field observations.
The primary surface faulting reaches a total length of ca. 6 km and shows a ca. 3 km-long zone of continuous and consistently oriented surface ruptures in proximity of the village of Paganica, along a prominent NW-SE oriented, SW dipping normal fault. The deformation occurred in a ca. 500 m-wide zone. Secondary surface ruptures (antithetic and sympathetic) occurred along nearby faults.
INGV - ISPRA joint database - 2009 L'Aquila earthquake surface rupture - Observation points: this file contains the tectonic ruptures observation points containing information about the typology, the geometrical characteristics, and a brief description of the observed feature. Credits: Blumetti et al., Report ISPRA 2009; Emergeo W.G., Terranova 2010 doi:10.1111/j.1365-3121.2009.00915.x; Cinti et al., JGR 2011 doi:10.1029/2010JB007988; Vittori et al., BSSA 2011 doi:10.1785/0120100140.
INGV - ISPRA joint database - 2009 L'Aquila earthquake surface rupture - Surface faulting trace: this file displays as a line coverage the primary surface faulting associated to the 6 April 2009, Mw 6.1 L'Aquila earthquake. It is composed of multiple discrete rupture traces (mainly SW-facing free-faces and open cracks) with individual length ranging from 3 m to ca. 200 m. The traces are built based on the observation point layer, and contain information about the typology, the geometrical characteristics and the affected lithology (for this latter field attribute see Pucci et al., JoM 2015 doi:10.1080/17445647.2014.927128).
INGV - ISPRA joint database - 2009 L'Aquila earthquake surface rupture - Secondary surface rupture trace: this file displays as a line coverage some of the secondary ruptures (antithetic and sympathetic) occurred along faults within the epicentral area
The LIDAr station in L'Aquila: setup for the european polar campaign
No full textA progress report of Ozone Lidar Station in L'Aquila (SLAQ) is presented. We extensively describe the experimental system and the recent upgrading; details about inversion of data are also given. We show some
preliminary ozone profiles which have been obtained at SLAQ and these measurements are discussed within the algorithm validation. In conclusion the data validation for the use in trajectory data analysis is also discussed.PublishedPorano1.8. Osservazioni di geofisica ambientaleope
Vicende e prospettive della ferrovia Sulmona-L'Aquila
Get PDFQuesto contributo intende inquadrare il ruolo territoriale della ferrovia Sumona-L'Aquila anche alla luce dell'evento sismico che ha interessato l'area attraversata.
A tal fine, il saggio ricostruisce la vicenda storica della costruzione della ferrovia Adriatico-Tirreno a partire dai primi progetti che connettono la costa adriatica con la capitale del giovane Regno d'Italia, attraverso il capoluogo aquilano. Tale circostanza si svolge in un arco temporale relativamente lungo e il progetto, sostenuto da notabili e amministratori locali, sia aquilani sia umbri, è sottoposto a notevoli rallentamenti, interruzioni, ripensamenti e a sovrapposizioni di ipotesi alternative o aggiuntive. Con la promulgazione della legge 29.07.1879, che stabilisce il collegamento ferroviario Roma-Sulmona quale opera di I Categoria, lo scenario fino ad allora perseguito cambia radicalmente: si accredita l'ipotesi del passaggio attraverso la Marsica, che riduce la distanza a 240 km. Nel 1888, quindi, si inaugura la ferrovia Sulmona-Roma e la nuova stazione ferroviaria di Sulmona, compresa di rimessa per locomotive che ne fanno uno dei depositi più importanti dell'Italia Centrale.
Parallelamente al declassamento della linea ferroviaria Sulmona-L'Aquila, si realizza la modificazione delle aree interne della regione, anche in considerazione del declino dell'economia della transumanza che ha una definitiva battuta d'arresto con lo spostamento degli armenti in forma stanziale nel Tavoliere e nell'agro romano e con il mutamento del demanio tratturale e di aree boschive in suolo agricolo. Le trasformazioni del territorio hanno nel complesso scarsa evidenza e sono comprensibili nelle prospettive inscritte nei cambiamenti postunitari e in quelli del secolo successivo per ciascuna delle sue parti. Negli ultimi decenni, tuttavia, l'insediamento si modifica e accresce lungo le direttrici della viabilità territoriale storica ed è attraversato dalla ferrovia o è accostato ad essa per lunghi tratti. E ancora, gli interventi di edilizia residenziale realizzati a seguito dell'evento sismico in larga misura insistono lungo la stessa direttrice costituita da strada e ferrovia. La stessa localizzazione è stata prescelta per la riorganizzazione nel territorio di molte delle funzioni urbane non residenziali (pubbliche e private) espulse dal centro in ragione del terremoto
The LIDAr station in L'Aquila: setup for the european polar campaign
No full textA progress report of Ozone Lidar Station in L'Aquila (SLAQ) is presented. We extensively describe the experimental system and the recent upgrading; details about inversion of data are also given. We show some
preliminary ozone profiles which have been obtained at SLAQ and these measurements are discussed within the algorithm validation. In conclusion the data validation for the use in trajectory data analysis is also discussed.PublishedPorano1.8. Osservazioni di geofisica ambientaleope
GROUND-BASED MONITORING OF PINATUBO AEROSOLS AND OZONE AT L'AQUILA, ITALY: EVIDENCES FOR OZONE DEPLETION DURING 1991/92 WINTER MONTHS
No full textPossible evidence for stratospheric ozone depletion at Northern mid-latitudes
as a consequence of the Pinatubo aerosol cloud is presented in this work.
A ten month record of aerosol and ozone measurements taken at the lidar station
of L'Aquila, Italy is compared to the 1985-1986 SBUV and SAGE II ozone data.
Ozonesonde data collected in the station of Hohenpeissenberg, Germany and
S. Pietro Capofiume, Italy are used to validate the DIAL measurements corrected
for the aerosol presence.Published91-951.8. Osservazioni di geofisica ambientaleJCR Journalope
GROUND-BASED MONITORING OF PINATUBO AEROSOLS AND OZONE AT L'AQUILA, ITALY: EVIDENCES FOR OZONE DEPLETION DURING 1991/92 WINTER MONTHS
No full textPossible evidence for stratospheric ozone depletion at Northern mid-latitudes
as a consequence of the Pinatubo aerosol cloud is presented in this work.
A ten month record of aerosol and ozone measurements taken at the lidar station
of L'Aquila, Italy is compared to the 1985-1986 SBUV and SAGE II ozone data.
Ozonesonde data collected in the station of Hohenpeissenberg, Germany and
S. Pietro Capofiume, Italy are used to validate the DIAL measurements corrected
for the aerosol presence.Published91-951.8. Osservazioni di geofisica ambientaleJCR Journalope
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