The space-time distribution of coseismic slip of the 21 February 2011, Mw 6.2, Christchurch earthquake, New Zealand, is explored, differently from all previous studies, through a joint inversion of geodetic and strong-motion data. The geodetic data consist of both Global Position System (GPS), from campaign and continuous stations, and Synthetic Aperture Radar (SAR) interferograms from two ascending satellite tracks. The strong motion data consist of 10 stations located in the Canterbury plains, these stations offering a good azimuthal coverage of the event. The kinematic rupture model for the analyzed event was obtained using the parameterization and nonlinear inversion scheme proposed by Delouis et al. (2002). In particular, for any subfault we explore for the local source time function (local slip history), slip direction, and rupture onset time. The geometry of the fault plane used for the kinematic inversion is inferred from the analysis of the geodetic data. To validate our results we perform a resolution study for both the single and complete data sets, and an errors analysis of our final kinematic rupture model. Considering the complexity highlighted by superficial deformation data, we adopted a fault model consisting of two partially overlapping segments, with dimensions 15x11 and 7x7 km2, corresponding to different faulting types. This two-fault model, instead of single fault model, is needed to reconstruct the complex shape of the superficial deformation data. The total seismic moment resulting from the joint inversion is 3.0x1025 dyne.cm (Mw = 6.2) with an average rupture velocity of 2.0 km/s.

Combining strong-motion, InSAR and GPS data to refine the fault geometry and source kinematics of the 2011, Mw 6.2, Christchurch earthquake (New Zealand) / E. M., Toraldo Serra; B., Delouis; Emolo, Antonio; Zollo, Aldo. - In: GEOPHYSICAL JOURNAL INTERNATIONAL. - ISSN 0956-540X. - 194:3(2013), pp. 1760-1777. [10.1093/gji/ggt186]

Combining strong-motion, InSAR and GPS data to refine the fault geometry and source kinematics of the 2011, Mw 6.2, Christchurch earthquake (New Zealand)

EMOLO, ANTONIO;ZOLLO, ALDO
2013

Abstract

The space-time distribution of coseismic slip of the 21 February 2011, Mw 6.2, Christchurch earthquake, New Zealand, is explored, differently from all previous studies, through a joint inversion of geodetic and strong-motion data. The geodetic data consist of both Global Position System (GPS), from campaign and continuous stations, and Synthetic Aperture Radar (SAR) interferograms from two ascending satellite tracks. The strong motion data consist of 10 stations located in the Canterbury plains, these stations offering a good azimuthal coverage of the event. The kinematic rupture model for the analyzed event was obtained using the parameterization and nonlinear inversion scheme proposed by Delouis et al. (2002). In particular, for any subfault we explore for the local source time function (local slip history), slip direction, and rupture onset time. The geometry of the fault plane used for the kinematic inversion is inferred from the analysis of the geodetic data. To validate our results we perform a resolution study for both the single and complete data sets, and an errors analysis of our final kinematic rupture model. Considering the complexity highlighted by superficial deformation data, we adopted a fault model consisting of two partially overlapping segments, with dimensions 15x11 and 7x7 km2, corresponding to different faulting types. This two-fault model, instead of single fault model, is needed to reconstruct the complex shape of the superficial deformation data. The total seismic moment resulting from the joint inversion is 3.0x1025 dyne.cm (Mw = 6.2) with an average rupture velocity of 2.0 km/s.
2013
Combining strong-motion, InSAR and GPS data to refine the fault geometry and source kinematics of the 2011, Mw 6.2, Christchurch earthquake (New Zealand) / E. M., Toraldo Serra; B., Delouis; Emolo, Antonio; Zollo, Aldo. - In: GEOPHYSICAL JOURNAL INTERNATIONAL. - ISSN 0956-540X. - 194:3(2013), pp. 1760-1777. [10.1093/gji/ggt186]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/547313
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