Joint inversion of co-seismic and early post-seismic slip: Application to the 2009 Mw6.3 LAquila earthquake, Central Italy

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Authors

Théa Ragon , Anthony Sladen , Quentin Bletery, Mathilde Vergnolle, Olivier Cavalié, Antonio Avallone

Abstract

Geodetic data provide static information on the displacement of the surface of the Earth, and allow for a detailed analysis of earthquake characteristics. Yet, geodetic data are generally characterized by either a good temporal or a good spatial resolution, but rarely both. This lack of resolution affects our understanding of the evolution of seismic and aseismic processes. Here, we propose a simple approach to counterbalance this lack of resolution by solving simultaneously for slip distributions on several time windows using datasets covering various time periods. This approach, also validated with a toy model, allows us to investigate the strictly co-seismic rupture of the Mw6.3 LAquila earthquake, Central Italy, and the processes at play on the fault during the first few days after the mainshock. We provide a strictly co-seismic slip model and a very early post-seismic model of the L’Aquila earthquake, and discuss the interactions between co-seismic slip, afterslip and aftershocks at short (6 days after mainshock) and long term (months after mainshock). We show that if the early post-seismic deformation is not acknowledged in earthquake source inversions, inferred co-seismic and post-seismic models may be largely biased. This work illustrates the importance of acknowledging the early post-seismic deformation to reliably address central scientific questions, such as the relationship between seismic and aseismic slip and their driving mechanisms, the interactions between on-fault deformation and aftershocks, and the agreement between nature and laboratory derived theories such as rate and state friction laws.

DOI

https://doi.org/10.31223/osf.io/urkga

Subjects

Earth Sciences, Geophysics and Seismology, Physical Sciences and Mathematics

Keywords

afterslip, Earthquake source, Bayesian, geodesy, co-seismic, data resolution, inverse problem, Italy, L'Aquila, post-seismic, slip model

Dates

Published: 2018-11-20 17:06

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License

GNU Lesser General Public License (LGPL) 2.1

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