Journal ArticleDOI
Fault Segmentation as Constraint to the Occurrence of the Main Shocks of the 2016 Central Italy Seismic Sequence
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In this article, the authors performed the finite-extent fault inversion of the three main events of the 2016 Central Italy seismic sequence using near-source strong-motion records and demonstrated that both earthquakes nucleation and rupture propagation were controlled by segmentation of the (N)NW-(S)SE-trending Quaternary normal faults.Abstract:
We perform the finite-extent fault inversion of the three main events of the 2016 Central Italy seismic sequence using near-source strong-motion records. We demonstrate that both earthquakes nucleation and rupture propagation were controlled by segmentation of the (N)NW–(S)SE-trending Quaternary normal faults. The first shock of the sequence (August 24th, Mw 6.0) ruptured at the relay zone between the Laga Mts (LF) and the Cordone del Vettore (CVF) normal faults. The second shock (October 26th, Mw 5.9) nucleated at a minor relay zone within the Mt. Vettore–Mt. Bove fault (VBF), while the third and largest one (October 30th, Mw 6.5) initiated at the relay zone between the VBF and CVF, triggering the multiple rupture of the VBF, CVF and probably LF. We show that this latter relay zone corresponds to the deeper, high-angle, fault-zone of the Sibillini Mts cross-structure, a thrust-ramp inherited from the Miocene-Pliocene contractional phase of the Apennines. This structure acted as a barrier to rupture propagation of the first two events thus defining an area of large stress concentration until it acted as the initiator of the rupture originating the largest Mw 6.5 event that crossed the barrier itself. We suggest that the “young” CVF have started to cut through the barrier acting as a soft-linkage between the two long-lived LF and VBF. The evidence that coseismic cumulative slip shows a maximum at the CVF, provided by both slip inversion and original surface rupture data, suggests that the CVF is growing faster than the adjacent faults.read more
Citations
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Journal ArticleDOI
Dual control of fault intersections on stop-start rupture in the 2016 Central Italy seismic sequence
Richard J. Walters,L. C. Gregory,Luke N J Wedmore,T. J. Craig,Ken McCaffrey,M. W. Wilkinson,Jinju Chen,Zhenhong Li,John Elliott,H. Goodall,Francesco Iezzi,Franz Livio,Alessandro Maria Michetti,Gerald P. Roberts,Eutizio Vittori +14 more
TL;DR: In this article, the authors exploit a wealth of geodetic, seismological and field data to understand the spatio-temporal evolution of the sequence and suggest that intersections between major and subsidiary faults controlled the extent and termination of rupture in each event in the sequence, and fluid diffusion, channelled along these same fault intersections, may also determined the timing of rupture reinitiation.
Journal ArticleDOI
Complex fault geometry and rupture dynamics of the Mw 6.5, 2016, October 30th central Italy earthquake
Laura Scognamiglio,Elisa Tinti,Emanuele Casarotti,Stefano Pucci,Fabio Villani,Massimo Cocco,Federica Magnoni,Alberto Michelini,Douglas S. Dreger +8 more
TL;DR: In this paper, the authors study the October 30th 2016 Norcia earthquake (MW 6.5) to retrieve the rupture history by jointly inverting seismograms and coseismic GPS displacements obtained by dense local networks.
Journal ArticleDOI
Seismic Reflection Profiles and Subsurface Geology of the Area Interested by the 2016–2017 Earthquake Sequence (Central Italy)
Massimiliano Porreca,Massimiliano Porreca,Giorgio Minelli,Maurizio Ercoli,A. Brobia,Paolo Mancinelli,Francesco Cruciani,Claudia Giorgetti,Filippo Carboni,Francesco Mirabella,Gian Paolo Cavinato,Andrea Cannata,Andrea Cannata,Cristina Pauselli,Massimiliano Rinaldo Barchi +14 more
Journal ArticleDOI
Correlation between tectonic CO2 Earth degassing and seismicity is revealed by a 10-year record in the Apennines, Italy
Giovanni Chiodini,Carlo Cardellini,Carlo Cardellini,F. Di Luccio,Jacopo Selva,Francesco Frondini,Stefano Caliro,Angelo Rosiello,Giulio Beddini,Guido Ventura +9 more
TL;DR: It is proposed that the evolution of seismicity is modulated by the ascent of CO2 accumulated in crustal reservoirs and originating from the melting of subducted carbonates, which favors the formation of overpressurized CO2-rich reservoirs potentially able to trigger earthquakes at crustal depth.
Journal ArticleDOI
Multi-segment rupture of the 2016 Amatrice-Visso-Norcia seismic sequence (central Italy) constrained by the first high-quality catalog of Early Aftershocks.
Luigi Improta,Diana Latorre,Lucia Margheriti,Anna Nardi,Alessandro Marchetti,Anna Maria Lombardi,Barbara Castello,Fabio Villani,Maria Grazia Ciaccio,Francesco Mariano Mele,Milena Moretti +10 more
TL;DR: Aftershock patterns reveal that the Amatrice Mw5.4 aftershock and the Norcia mainshock ruptured two distinct antithetic faults 3–4 km apart, and suggest to consider both the MST cross structure and the subsidiary antithetic fault in the finite-fault source modelling of thenorcia earthquake.
References
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Journal ArticleDOI
New Empirical Relationships among Magnitude, Rupture Length, Rupture Width, Rupture Area, and Surface Displacement
TL;DR: In this article, a series of empirical relationships among moment magnitude (M ), surface rupture length, subsurface rupture length and downdip rupture width, and average surface displacement per event are developed.
Journal ArticleDOI
Fault behavior and characteristic earthquakes: Examples from the Wasatch and San Andreas Fault Zones
TL;DR: In this article, an analysis of scarp-derived colluvium in trench exposures across the Wasatch fault provides estimates of the timing and displacement associated with individual surface faulting earthquakes.
Journal ArticleDOI
A simple method to calculate green's functions for elastic layered media
TL;DR: In this paper, it was shown that the Green9s functions for an elastic layered medium can be expressed as a double integral over frequency and horizontal wavenumber, which can be exactly represented by a discrete summation.
Journal ArticleDOI
Seismic waves in a stratified half space.
Brian Kennett,N. J. Kerry +1 more
TL;DR: In this paper, the response of a stratified elastic half space to a general source may be represented in terms of the reflection and transmission properties of the regions above and below the source.
Journal ArticleDOI
A proposal for the kinematic modelling of W-dipping subductions - possible applications to the Tyrrhenian-Apennines system
TL;DR: In this article, a frontal wedge is constructed from the stacking of the upper layers of the subducting plate and the syntectonic clastics that fill the foredeep which are progressively involved in thrusting and later by extension.
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