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- W1844352986 abstract "Abstract We propose a method to precisely estimate earthquake source parameters as magnitude, size of rupture, stress drop, and coseismic slip, and their uncertainties. This method, which relies on a Bayesian approach, allows the determination of the scalar seismic moment, corner frequency ( f c ), and their associated uncertainties, by inverting ratios between seismic displacement spectra of nearby located earthquakes. We apply this method to a large earthquake multiplet (56 events) located under the northern coast of the Corinth gulf at 8 km depth. This multiplet is regularly active between 2001 and 2007. Results show f c P / f c S ratios globally between 1.0 and 1.5 which is compatible with the values predicted by Madariaga's circular rupture model. In detail, six earthquakes, however, exhibit corner frequency variations as a function of the station azimuth compatible with linear rupture propagation. Magnitude ranges 1.08 and 2.80 with a b value of 1.04. Source rupture length globally ranges between 40 and 170 m for stress drop between 1 and 100 MPa. We show that the number of ruptures and the cumulated coseismic slip are maximal at the center of the multiplet: this suggests that Multiplet‐866 could be seen as a weak seismogenic patch surrounded by a locked fault. However, the large value of the maximum coseismic slip cumulated over the period 2000–2008 (10 cm) rather suggests creep allowing rapid stress reloading and repeated earthquakes with short delays. We therefore propose that Multiplet‐866 is surrounded by a heterogeneous fault surface with both locked and creeping areas." @default.
- W1844352986 created "2016-06-24" @default.
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- W1844352986 date "2015-11-01" @default.
- W1844352986 modified "2023-10-01" @default.
- W1844352986 title "Bayesian inversion of seismic spectral ratio for source scaling: Application to a persistent multiplet in the western Corinth rift" @default.
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- W1844352986 doi "https://doi.org/10.1002/2015jb012217" @default.
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