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Mastrolembo Ventura, Brunella
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Mastrolembo Ventura, Brunella
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Mastrolembo, B
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- PublicationOpen AccessKinematics of the Central Mediterranean Plate Boundary, Internal Deformation of Sicily and Interseismic Strain Accumulation Across the Messina Straits(2008-03)
; ; ; ; ; ; ; ;Serpelloni, E.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italia ;Bonforte, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;Anzidei, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italia ;Puglisi, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;Baldi, P. ;Mastrolembo, B. ;Burgmann, R.; ; ; ; ; ; ;EGUIn this work we present a new velocity field, obtained by analyzing continuous GPS (CGPS) stations operating in the Mediterranean area (updated to September 2007)and epoch GPS (EGPS) stations in the 1991-2006 time span, particularly denser in the Iblean plateau and across the Messina Straits.147 108 - PublicationOpen AccessKinematic block modeling of GPS velocities in Italy and seismic potential(2013-05-18)
; ; ; ; ;Anderlini, Letizia; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia ;Serpelloni, Enrico; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italia ;Vannucci, Gianfranco; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia ;Mastrolembo, Brunella; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia; ; ; We use a dense GPS velocity field, from the analysis of >1000 continuous stations, and elastic block modeling to study the interseismic strain accumulation along the Alpine and Apennines active tectonic belts in Italy. We consider available fault catalogues, instrumental and historical seismicity to determine the blocks boundaries geometry, parameterized as uniformly slipping rectangular planes. We invert horizontal velocities to estimate Euler vectors of tectonic blocks together with slip-rates at block-bounding faults. When allowed by density of GPS data, we optimize faults dip and locking-depth by searching the parameters that provide the best fit to local GPS data. Overall we obtain a good fit of the horizontal velocities and geodetic slip rates that are kinematically consistent with available geological and seismotectonic information. We use the best-fit geometric and kinematic model parameters to compute the expected GPS velocities over a dense regular grid. Denser model velocities are used to estimate the velocity gradient field on a regular grid, made by cell elements of 0.25°x0.25°. Geodetic strain-rates at each cell are converted into seismic moment accumulation rates, following the Kostrov formulation, considering as seismogenic thickness values obtained from a crustal (EPcrust) model and earthquake hypocentral distribution. Geodetic moment accumulation rates are compared with seismic moment rates released by earthquakes, obtained from the analysis of a seismic catalogue realized by merging several instrumental and historical catalogues covering the 1600-2012 timespan, and uniformly defined moment magnitudes. The comparison between geodetic moment accumulation rates and seismic moment release rates highlights regions with significant moment deficits but also areas with a surplus of the seismic moment released, with important implications for seismic hazard evaluations and assumptions behind the approach used in this work.396 124 - PublicationOpen AccessGeodetic slip-rates from block-modeling of a dense GPS velocity field in Italy: new clues on seismic potential from comparison with seismic moment release(2012-12-03)
; ; ; ; ;Anderlini, Letizia; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia ;Serpelloni, Enrico; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italia ;Vannucci, Gianfranco; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia ;Mastrolembo, Brunella; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia; ; ; The growing number of GPS stations in Italy and surrounding regions allows to study, with increasingly spatial details, the velocity gradients across the major seismogenic faults belonging to the complex Central Mediterranean segment of the Nubia-Eurasia plate boundary. If the regional scale pattern of the strain-rate field has been already constrained by several authors, adopting different schemes of sparse velocities interpolation algorithms, showing consistency with seismotectonics data, an estimate of the geodetic slilp-rates at a regional scale is still missing. In this work we use data from > 1000 GPS stations to determine a uniformly defined velocity field, though the analysis of position time-series realized in the ITRF08 reference frame. We use an elastic block-modeling approach to model interseismic fault slip-rates while accounting for rotations of crustal blocks within the complex Central Mediterranean microplates mosaic. We use available catalogues of active faults and instrumental seismicity to define the model geometry, where faults are parameterized as uniformly slipping rectangular planes. The model provides a good fit to the horizontal velocities and fault kinematics that are largely consistent with other geological and seismotectonics information. The estimated geodetic slip-rates are generally faster than the geological ones, considering the large uncertainties associated to the available geologic rates. We use the best-fit block model to calculate a continuous horizontal velocity field and the resulting strain-rate field, which is converted into seismic-moment accumulation rate. We compare the geodetic moment rate with the seismic moment rate obtained from summation of historical and instrumental seismic catalogues, homogeneously pre-processed. The comparison shows areas characterized by moment deficits, opening new clues on the seismic potential of Italy.265 72 - PublicationOpen AccessSTIMA DEL TASSO DI DEFORMAZIONE ATTRAVERSO LO STRETTO DI MESSINA DALLA COMBINAZIONE DI RETI DI STAZIONI GPS PERMANENTI E NON-PERMANENTI(2008-12-10)
; ; ; ;progetto Messina GPS team ;Serpelloni, E.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italia ;Baldi, P. ;Mastrolembo, B. ;progetto Messina GPS team; ; ; ;INGVIn this paper we show results from the combinantion of GPS and CGPS data to estimate the velocity and strain fields across the Messina Straits. Data from CGPS networks of ASI, RING and ITALPOS together with GPS data collected since 1980 during repeated campaigns and recently in the frame of the "Progetto Messina" funded by DPC, are discussed and interpreted to improve the current kinematics of this seismic area.144 151 - PublicationOpen AccessStrain accumulation across the Messina Straits and kinematics of Sicily and Calabria from GPS data and dislocation modeling(2010-10-01)
; ; ; ; ; ; ;Serpelloni, E.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italia ;Burgmann, R.; University of California, Berkeley ;Anzidei, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italia ;Baldi, P.; Università di Bologna ;Mastrolembo Ventura, B.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia ;Boschi, E.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione AC, Roma, Italia; ; ; ; ; We use Global Positioning System (GPS) velocities and dislocation modeling to investigate the rate and nature of interseismic strain accumulation in the area affected by the 1908 Mw 7.1 Messina earthquake (southern Italy) within the framework of the complex central Mediterranean microplate kinematics. Our data confirm a change in the velocity trends between Sicily and Calabria, moving from NNW-ward to NE- ward with respect to Eurasia, and detail a fan-like pattern across the Messina Straits where maximum extensional strain rates are ~65 nanostrains/yr. Extension normal to the coast of northern Sicily is consistent with the presence of SW–NE trending normal faults. Half-space dislocation models of the GPS velocities are used to infer the slip-rates and geometric fault parameters of the fault zone that ruptured in the Messina − 1.3 earthquake. The inversion, and the bootstrap analysis of model uncertainties, finds optimal values of 3. 5 + 2.0 − 0.2 − 0.7 and 1.6 + 0.3 mm/yr for the dip–slip and strike–slip components, respectively, along a 30 + 1.1° SE-ward dipping normal fault, locked above 7.6−2.9 km depth. By developing a regional elastic block model that + 4.6 accounts for both crustal block rotations and strain loading at block-bounding faults, and adopting two different competing models for the Ionian–Calabria convergence rates, we show that the measured velocity gradient across the Messina Straits may be significantly affected by the elastic strain contribution from other nearby faults. In particular, when considering the contribution of the possibly locked Calabrian subduction interface onto the observed velocity gradients in NE-Sicily and western Calabria, we find that this longer wavelength signal can be presently super-imposed on the observed velocity gradients in NE-Sicily and Calabria. The inferred slip-rate on the Messina Fault is significantly impacted by elastic strain from the subduction thrust. By varying the locking of the subduction thrust fault, in fact, the Messina Fault slip-rate varies from 0 to 9 mm/yr.249 496 - PublicationRestrictedFast geodetic strain-rates in eastern Sicily (southern Italy): New insights into block tectonics and seismic potential in the area of the great 1693 earthquake(2014-08-13)
; ; ; ; ; ; ; ; ;Mastrolembo Ventura, B.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia ;Serpelloni, E.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italia ;Argnani, A.; ISMAR-CNR, Istituto di Scienze Marine, Sede di Bologna, Italy ;Bonforte, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia ;Burgmann, R.; Department of Earth and Planetary Science, University of California, Berkeley, USA ;Anzidei, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italia ;Baldi, P.; Dipartimento di Fisica e Astronomia, Settore di Geofisica, Università di Bologna, Italy ;Puglisi, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia; ; ; ; ; ; ; Along the ∼500km long Sicily–Calabria segment of the Nubia–Eurasia plate boundary GPS data highlight a complex, and debated, kinematic pattern. We focus on eastern Sicily, where the style of crustal deformation rapidly changes in the space of few tens of kilometers. In southeastern Sicily, struck by the 1693MW∼7.4earthquake, GPS measurements highlight a steep velocity gradient, with ∼2.4mm/yr of ∼N–S shortening in ∼10km, changing to broader extension (∼3mm/yr in ∼60km) in northern Sicily and shortening in the southern Tyrrhenian Sea. GPS data and kinematic elastic block models highlight a complex fragmentation of the Sicilian domain into three tectonic blocks, which move independently from Nubia, describing an overall clockwise rotation of this crustal domain with respect to Eurasia. Shortening in southeastern Sicily is associated witha system of high-angle reverse faults resulting from tectonic inversion of extensional faults at the northern tip of the Hyblean plateau. Extension in northern Sicily occurs on a broader deformation belt, developed on the former Kumeta–Alcantara line, extending west of Mount Etna toward the southwestern Tyrrhenian Sea, accommodating the faster rotation of the northeastern Sicily block with respect to central Sicily. Although the seismic potential of inland faults is not negligible, our results strengthen the hypothesis that the Malta escarpment is the likely source of the large 1693 earthquake and tsunami. The observed kinematics appears only subordinately driven by the Nubia–Eurasia convergence and the dynamics of the Mediterranean subduction system is likely playing a major role in governing block motions and active tectonics in Sicily.559 32 - PublicationOpen AccessActive strain-rate Across the Messina Straits and Kinematics of Sicily and Calabria From GPS Data(2009)
; ; ; ; ; ; ;mastrolembo ventura, brunella; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia ;Serpelloni, E.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italia ;Burgmann, R.; Department of Earth and Planetary Science, University of California, Berkeley, USA. ;Anzidei, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italia ;Baldi, P.; Dipartimento di Fisica, Università degli Studi di Bologna, Italy. ;Cavaliere, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia; ; ; ; ; ; European Geoscience UnionThe Messina Straits is the locus of one of the strongest seismic event that ever hit Italy during historical times, the 1908 Mw 7.1 earthquake, and the same region also suffered major damage from other strong earthquakes in the last few centuries. However, despite the large amount of data and studies carried out, our knowledge of the present-day deformation of this area is still debated. While a general consensus has been reached about the kinematics of the 1908 causative fault, less is known about the rate and shape of interseismic loading across the Straits, and debate continues also about the general kinematics and geodynamic framework of this region which are strongly influenced by subduction and retreat of Ionian lithosphere. Thanks to the increasing number of GPS Networks in the study region it is now possible to study both the regional kinematics and strain loading across active faults. In this work we analyze all the observations collected over the Messina non-permanent GPS Network for the 1994-2008 time span, and data from about 600 CGPS stations in the Euro-Mediterranean region, using the GAMIT software. The output of our analysis is a new and denser velocity field, which is used to study the plate kinematics and the rate of interseismic strain building across the Straits. GPS velocities show a sudden change in their orientation across the Straits moving to NNW-ward, in Estern Sicily, to NNE-ward in Western Calabria, depicting this area as a primary boundary between two different tectonic domains. The maximum strain-rates observed across the Straits are about 120 nanostrain/yr, with extension oriented about normal to the coasts of Sicily according to the presence of a normal fault. The measured velocity gradient can be used to model the creeping dislocation at depth, however, over the Messina Straits the interseismic elastic strains accumulating across other nearby active faults can significantly affect the observed velocity gradient.For this reason we investigate, using a regional elastic block-modeling approach, these effects. We use the block model to test for different microplates configurations and to account for nearby active faults while inverting for optimal fault geometry and intersismic slip-rates across the Straits.317 462