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  • 04. Solid Earth::04.03. Geodesy::04.03.01. Crustal deformations  (16)
  • Elsevier Science Limited  (14)
  • Blackwell Publishing Ltd  (2)
  • Periodicals Archive Online (PAO)
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  • 11
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    Gravitational potential energy and active deformation in the Apennines (2015)
    Elsevier Science Limited
    Details
    Publication Date: 2017-04-04
    Description: We use velocity measurements from a network of continuous GPS sites spanning the Apennines of peninsular Italy to test the hypothesis that the active deformation of the region is explained by variations in gravitational potential energy of the lithosphere. The simple geometry of the mountain chain allows us to treat the deformation as two-dimensional, neglecting gradients of velocity along the strike of the chain. Under this assumption, the integral of gravitational potential energy per unit area of the lithosphere (GPE) in the direction perpendicular to the chain is related by a simple expression to the velocity in the same direction. We show that the observed velocities match this expression with an RMS misfit of 0.5 mm/yr. This agreement suggests that deformation of the Apennines reflects a balance, within the mountain chain itself, between lateral variations in GPE and the stresses required to deform the lithosphere. Forces arising from processes external to the belt are not required to explain the observations.
    Description: Published
    Description: 121-132
    Description: 1T. Geodinamica e interno della Terra
    Description: JCR Journal
    Description: restricted
    Keywords: Apennines ; tectonics ; gravitational potential energy ; seismic hazard ; 04. Solid Earth::04.03. Geodesy::04.03.01. Crustal deformations
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 12
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    Current stress and strain-rate fields across the Dead Sea Fault system: constraints from seismological data and GPS observations. (2014)
    Elsevier Science Limited
    Details
    Publication Date: 2017-04-04
    Description: The stress and strain-rate fields characterizing the Dead Sea Fault System are investigated by using seismological and geodetic observations. In order to assess spatial variations in the regional stress field, we compiled a multidisciplinary dataset of well-constrained horizontal indicators, by merging all available data reported in literature with the data obtained in this study through weighted stress inversions of focal plane solutions. Our findings indicate that the state of stress is characterized by the coexistence of a normal faulting stress regime with the primarily strike-slip one, according to the regional frame illustrated by previous geological and seismological observations. An updated velocity field computed from new observations and earlier published data, depicts the general left-lateral motion of the Dead Sea fault system well. In agreement with previous studies, we detected some differences in the slip-rate pattern between the northern and the southern sectors of the fault system. The geodetic strain-rate field highlights how much of the deformation is accommodated along the fault system itself in a narrow region. The comparison between the stress and the strain-rate directions reveals that both orientations are near-parallel, clearly indicating that present-day crustal stress and ground deformation patterns are chiefly driven by the same tectonic processes.
    Description: Published
    Description: 305-316
    Description: 2T. Tettonica attiva
    Description: JCR Journal
    Description: restricted
    Keywords: Focal mechanisms ; stress ; GPS ; strain-rate ; Dead Sea Fault System ; 04. Solid Earth::04.03. Geodesy::04.03.01. Crustal deformations
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 13
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    The influence of erosional processes on the visibility of Permanent Scatterers Features from SAR remote sensing on Mount Etna (E Sicily) (2014)
    Elsevier Science Limited
    Details
    Publication Date: 2017-04-04
    Description: Analysis of 1549 DInSAR interferograms, covering the period from 2003 to 2010, has highlighted significant motion along the entire set of the active faults identified by advanced DInSAR analyses (i.e. Permanent Scatterers Features, PSF), affecting the Mount Etna volcano, in eastern Sicily. In the analysed period, the absence of significant seismicity producing co-seismic ground deformation suggests that the overall deformation that has been recognized on the interferograms is to be associated with interseismic, almost continuous creep which is, well documented along most of the active faults. According to field evidence, the structures should accumulate displacements resulting in their permanent visibility on the interferograms, progressively increases through time. This expected behaviour has been recognised only for part of the entire set of structures. Other tectonic features, in fact, show episodic appearances, alternating with periods of absence of ground displacement on the interferograms, simulating a stick-slip mechanism of deformation, conflicting with field evidence. This apparently incongruous behaviour can be interpreted as the result of topographic changes due to the combination of the tectonic displacements with related amounts of the differential erosion and deposition across the fault line. The comparison between the history of the appearances and the monthly rainfall in the region seems to demonstrate that these structures appear when one of the two interacting processes governing the topographic changes around the fault, i.e. tectonic vs. erosional, prevails over the other. Otherwise, the same structures are not evident on the interferograms when the two components are in balance.
    Description: Published
    Description: 128-137
    Description: 5IT. Osservazioni satellitari
    Description: JCR Journal
    Description: restricted
    Keywords: fault ; slip rates ; InSAR ; ground deformation ; erosion ; volcano-tectonics ; 04. Solid Earth::04.03. Geodesy::04.03.01. Crustal deformations
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 14
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    The Diffuse Plate boundary of Nubia and Iberia in the Western Mediterranean: crustal deformation evidence for viscous coupling and fragmented lithosphere (2016)
    Elsevier Science Limited
    In:  This work has been supported by the Spanish MINECO research projects AYA2010-17448 and ESP2013-47780-C2-1-R. It is a contribution for the Moncloa Campus of International Excellence.
    Details
    Publication Date: 2017-04-04
    Description: A spatially dense GNSS-based crustal velocity field for the Iberian Peninsula and Northern Africa allow us to provide new insights into two main tectonic processes currently occurring in this area. In particular, we provide, for the first time, clear evidence for a large-scale clockwise rotation of the Iberian Peninsula with respect to stable Eurasia (Euler pole component: N42.612°, W1.833°, clockwise rotation rate of 0.07 deg/Myr). We favour the interpretation that this pattern reflects the quasi-continuous straining of the ductile lithosphere in some sectors of South and Western Iberia in response to viscous coupling of the NW Nubia and Iberian plate boundary in the Gulf of Cádiz. We furnish evidence for a fragmentation of the western Mediterranean basin into independent crustal tectonic blocks, which are delimited by inherited lithospheric shear structures. Among these blocks, an (oceanic-like western) Algerian one is currently transferring a significant fraction of the Nubia-Eurasia convergence rate into the Eastern Betics (SE Iberia) and likely causing the eastward motion of the Baleares Promontory. These processes can be mainly explained by spatially variable lithospheric plate forces imposed along the Nubia-Eurasia convergence boundary.
    Description: Published
    Description: 439-447
    Description: 1T. Geodinamica e interno della Terra
    Description: JCR Journal
    Description: restricted
    Keywords: GNSS velocity field ; crustal rotation ; quasi-continuous straining ; Iberia ; 04. Solid Earth::04.03. Geodesy::04.03.01. Crustal deformations
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 15
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    Active upper crust deformation pattern along the southern edge of the Tyrrhenian subduction zone (NE Sicily): Insights from a multidisciplinary approach (2016)
    Elsevier Science Limited
    Details
    Publication Date: 2017-04-04
    Description: Using a multidisciplinary dataset based on gravimetric, seismic, geodetic and geological observations,we provide an improved picture of the shallow structure and dynamics of the southern edge of the Tyrrhenian subduction zone.With a local earthquake tomographywe clearly identify twomain crustal domains in the upper 15 kmcharacterized by different P-wave velocity values: a high-velocity domain comprising southeasternmost Tyrrhenian Sea, NE Sicily and Messina Straits, and a low-velocity domain comprising Mt. Etna and eastern Sicily. The transition between the two domains shows a good spatial correspondence with a wider set of faults including the Taormina Fault System (TFS) and the Aeolian–Tindari–Letojanni Fault System (ATLFS), two nearly SE-striking fault systems crossing northeastern Sicily and ending on the Ionian shoreline of Sicily according to many investigators. Within this set of faults, most of the deformation/seismicity occurs along the northern and central segments of ATLFS, compared to lowactivity along TFS. A lack of seismicity (both recent and historical) is observed in the southern sector of ATLFS where, however, geodetic data reveal significant deformation. Ourmultidisciplinary dataset including offshore observations suggests the southeastward continuation of the ATLFS into the Ionian Sea until joiningwith the faults cutting the Ionian accretionarywedge described in the recent literature. Our findings imply the existence of a highly segmented crustal shear zone extending from the Aeolian Islands to the Ionian Abyssal plain, that we believe plays the role of accommodating differential motion between the Southern Tyrrhenian unit and the western compressional domain of Sicily. The ATLFS, which is a main part of the inferred shear zone, behaves similarly to what often observed at the edges of retreating subduction
    Description: Published
    Description: 205-218
    Description: 1T. Geodinamica e interno della Terra
    Description: 2T. Tettonica attiva
    Description: 3T. Pericolosità sismica e contributo alla definizione del rischio
    Description: 1A. Geomagnetismo e Paleomagnetismo
    Description: 6A. Monitoraggio ambientale, sicurezza e territorio
    Description: JCR Journal
    Description: restricted
    Keywords: subduction edge ; seismic velocity structure ; 04. Solid Earth::04.01. Earth Interior::04.01.99. General or miscellaneous ; 04. Solid Earth::04.02. Exploration geophysics::04.02.99. General or miscellaneous ; 04. Solid Earth::04.02. Exploration geophysics::04.02.02. Gravity methods ; 04. Solid Earth::04.02. Exploration geophysics::04.02.04. Magnetic and electrical methods ; 04. Solid Earth::04.02. Exploration geophysics::04.02.06. Seismic methods ; 04. Solid Earth::04.03. Geodesy::04.03.99. General or miscellaneous ; 04. Solid Earth::04.03. Geodesy::04.03.01. Crustal deformations ; 04. Solid Earth::04.03. Geodesy::04.03.03. Gravity and isostasy ; 04. Solid Earth::04.03. Geodesy::04.03.04. Gravity anomalies ; 04. Solid Earth::04.03. Geodesy::04.03.05. Gravity variations ; 04. Solid Earth::04.03. Geodesy::04.03.06. Measurements and monitoring ; 04. Solid Earth::04.03. Geodesy::04.03.07. Satellite geodesy ; 04. Solid Earth::04.04. Geology::04.04.99. General or miscellaneous ; 04. Solid Earth::04.04. Geology::04.04.06. Rheology, friction, and structure of fault zones ; 04. Solid Earth::04.04. Geology::04.04.09. Structural geology ; 04. Solid Earth::04.05. Geomagnetism::04.05.99. General or miscellaneous ; 04. Solid Earth::04.05. Geomagnetism::04.05.03. Global and regional models ; 04. Solid Earth::04.05. Geomagnetism::04.05.04. Magnetic anomalies ; 04. Solid Earth::04.06. Seismology::04.06.99. General or miscellaneous ; 04. Solid Earth::04.06. Seismology::04.06.01. Earthquake faults: properties and evolution ; 04. Solid Earth::04.06. Seismology::04.06.07. Tomography and anisotropy ; 04. Solid Earth::04.07. Tectonophysics::04.07.99. General or miscellaneous ; 04. Solid Earth::04.07. Tectonophysics::04.07.02. Geodynamics ; 04. Solid Earth::04.07. Tectonophysics::04.07.04. Plate boundaries, motion, and tectonics ; 04. Solid Earth::04.07. Tectonophysics::04.07.05. Stress ; 04. Solid Earth::04.07. Tectonophysics::04.07.06. Subduction related processes ; 04. Solid Earth::04.07. Tectonophysics::04.07.07. Tectonics
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 16
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    Episodic slow slip events and seaward flank motion at Mt. Etna volcano (Italy) (2017)
    Elsevier Science Limited
    Details
    Publication Date: 2017-04-04
    Description: Episodic aseismic slip events have recently been detected at a variety of tectonic and volcanic environments, sparking the curiosity of seismic and geodetic communities. Here, a sequence of 7 slow slip events occurring at Mt. Etna since mid-2009 has been analyzed. Observed displacement fields evidence that the sequence involves two contiguous sectors of the unstable eastern flank, delimited by the Timpe faults. The tectonic control played by these faults can also be recognized on the long-term (2003–2015) velocity field. Elastic modelling of the long-term velocity field infers a sub-horizontal plane slightly dipping eastward and located within the sedimentary basement at shallow depth. Slip distribution models for each slow-slip event highlight how the largest slip values were centred on the SE edge of the sub-horizontal plane during 4 events and on the NE edge during the remaining 3 ones. The recognized events do not appear correlated with volcanic activity, although there is a possible correlation between slow-slip events and inflating episodes of the volcano.
    Description: Published
    Description: 8-14
    Description: 1V. Storia e struttura dei sistemi vulcanici
    Description: JCR Journal
    Description: restricted
    Keywords: Slow slip event ; Unstable flank ; Decollement ; Distributed slip model ; Etna ; 04. Solid Earth::04.03. Geodesy::04.03.01. Crustal deformations ; 04. Solid Earth::04.04. Geology::04.04.06. Rheology, friction, and structure of fault zones
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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