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  • 1
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    InSAR surface displacement field and fault modelling for the 2003 Bam earthquake (southeastern Iran) (2005)
    ELSEVIER
    Details
    Publication Date: 2017-04-04
    Description: Descending and ascending track satellite images of the new European C-band Envisat Advanced Synthetic Aperture Radar have been used to detect the surface displacement field during the 26 December 2003, Mw 6.5, Bam earthquake in southeastern Iran and to determine the fault parameters. In this work, displacement field maps have been realized from interferograms for both tracks. The surface displacement pattern from InSAR revealed that slip occurred along an unknown fault. Based on modelling (Okada, 1985), fault parameters with variable slip distribution (geometric and kinematic) have been considered to better reproduce the InSAR pattern. These parameters have been also constrained by the available seismological data. The modelled interferogram versus the unwrapped interferogram shows low residual values for a fault 18 km long, 12 km wide and with a top of the fault plane at 0.5 km from the surface. The best fitting strike, dip and rake are 177◦, 88◦ and 166◦, respectively.
    Description: Published
    Description: 347-353
    Description: reserved
    Keywords: Bam earthquake ; Iran ; InSAR ; Fault modelling ; Envisat satellite ; 04. Solid Earth::04.03. Geodesy::04.03.07. Satellite geodesy
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Format: 728071 bytes
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  • 2
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    Subsidence induced by urbanisation in the city of Rome detected by advanced InSar technique and geotechnical investigations (2008)
    Elsevier
    Details
    Publication Date: 2017-04-04
    Description: We applied the Interferometric Point Target Analysis (IPTA) technique to study the city of Rome (Italy) aiming to detect and measure the surface movements of buildings and urban structures. The available SAR dataset has been delivered by ESA CAT1 3258 and ranges the period 1992–2005. In particular ERS1–ERS2 data processed covers 1995–2000, while Envisat ASAR 2002–2005. The Point Target velocity map shows a general stability except for some very local areas affected by subsidence rate larger than 10 mm/year. The analysis of the time series, compared to a detailed geological and geotechnical investigation of the lithostratigraphy of the alluvial sediments of the Tiber River, and combined with a temporal reconstruction of the expansion of the city over the alluvial valleys, allowed us to depict the main factors controlling the observed subsidence. These are: the in situ effective stress conditions, the related compressibility and viscous characteristics of the loaded soils, the thickness of the compressible stratum, the time since loading instant, and the entity of loading. Furthermore the observed subsidence is time-dependent, even at a long time-scale, with respect to the age of the buildings being most of the buildings constructed since the '50s still affected by slow subsidence. We mainly focused on the Grottaperfetta stream valley that is characterized by an anomalous high and time-lasting subsidence. Original data on the lithostratigraphic setting of this alluvial valley indicate that the high subsidence rate measured up to 2005 is caused by a still active primary consolidation process.
    Description: Published
    Description: 3160-3172
    Description: 1.10. TTC - Telerilevamento
    Description: JCR Journal
    Description: reserved
    Keywords: advanced InSar ; IPTA ; Urban subsidence ; Geotechical investigation ; 04. Solid Earth::04.03. Geodesy::04.03.07. Satellite geodesy
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 3
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    Characterization of active fault scarps from LiDAR data: a case 1 study from Central 2 Apennines (Italy) (2012)
    Elsevier Science
    Details
    Publication Date: 2017-04-04
    Description: A high resolution DEM (1 ms spacing) derived from an airborne LiDAR campaign was 11 used in an attempt to characterize the structural and erosive elements of the geometry of the Pettino 12 fault, a seismogenic normal fault in Central Apennines (Italy). Four 90- to 280 m -long fault scarp 13 segments were selected and the surface between the base and the top of the scarps was analyzed 14 through the statistical analysis of the following DEM-derived parameters: altitude, height of the 15 fault scarp, distance along strike, slope and aspect. The results identify slopes of up to 40° in faults 16 lower reaches interpreted as fresh faces, 34° up the faces. The Pettino fault maximum long slipe17 rate (0.6-1.1 mm/yr) was estimated from the scarp heights, which are up to 12 and 19 m in the 18 selected four segments, and the age (ca. 18 ka) of the last glacial erosional phase in the area. The 19 combined analysis of the DEM-derived parameters allow us to (a) define aspects of 3D scarp 20 geometry, (b) decipher its geomorphological significance, and (c) estimate the long-term slip rate.
    Description: Published
    Description: 279-287
    Description: 1.10. TTC - Telerilevamento
    Description: JCR Journal
    Description: open
    Keywords: LiDAR ; Fault scarp ; Morphology ; Pettino fault (Abruzzi) ; 04. Solid Earth::04.03. Geodesy::04.03.07. Satellite geodesy ; 04. Solid Earth::04.03. Geodesy::04.03.09. Instruments and techniques ; 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring ; 04. Solid Earth::04.08. Volcanology::04.08.07. Instruments and techniques ; 05. General::05.01. Computational geophysics::05.01.01. Data processing
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 4
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    The August 17, 1999 Izmit, Turkey, earthquake: slip distribution from dislocation modeling of DInSAR and surface offset (2005)
    Details
    Publication Date: 2019-11-04
    Description: We show the results of application of Differential SAR Interferometry to the MW 7.4, August 17, 1999, Izmit earthquake, Western Turkey. The differential interferogram is obtained using an interferometric ERS2 ascending pair with a time interval of 35 days (August 13th - September 17th). The fringe pattern clearly defines the coseismic displacement field extended in an area of about 100 km N-S and 120 km E-W. The analysis of the interferogram shows the right-lateral strike-slip movement on the activated section of the North Anatolian fault system. The maximum SAR-detected displacement ranges between 117.6 cm and 134.4 cm in the proximity of Gölcük. We invert SAR data for uniform dislocation on a single fault plane using a Montecarlo procedure, with the aim of testing a large set of a priori possible asperity distributions on the fault. We then use a forward modeling approach to evaluate the slip variability for the dislocation using additional constraints as surface offsets and seismicity distribution: in this case we allow unit cells to undergo different values of slip in order to refine the initial dislocation model. Misfits between SAR data and modeled slant range displacements are generally low for all our models (~ 12 cm). Our results indicate that slip is concentrated in the central-western part of the fault, in the upper 10-15 km, tapering to the fault tips. For the Izmit case, we note that a well constrained fault model can be obtained only integrating DInSAR data with additional observations. This is mainly due to an undersampling of the displacement field by DInSAR, caused by decorrelation and lack of image data.
    Description: Published
    Description: 527-536
    Description: JCR Journal
    Description: open
    Keywords: 1999 Izmit earthquake ; Differential SAR Interferometry ; coseismic displacement field ; Montecarlo method ; 04. Solid Earth::04.03. Geodesy::04.03.07. Satellite geodesy
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Format: 389252 bytes
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