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Nucleation Phase and Dynamic Inversion of the Mw 6.9 Valparaíso 2017 Earthquake in Central Chile

Abstract : The Valparaiso 2017 sequence occurred in the Central Chile megathrust, an active zone where the last mega-earthquake occurred in 1730. Intense seismicity started 2 days before the Mw 6.9 mainshock, a slow trenchward movement was observed in the coastal GPS antennas and was accompanied by foreshocks and repeater-type seismicity. To characterize the rupture process of the mainshock, we perform a dynamic inversion using the strong-motion records and an elliptical patch approach. We suggest that a slow slip event preceded and triggered the Mw 6.9 earthquake, which ruptured an elliptical asperity (semiaxis of 10 km and 5 km, with a subshear rupture, stress drop of 11.71 MPa, yield stress of 17.21 MPa, slip weakening of 0.65 m, and kappa value of 1.98). This earthquake could be the beginning of a long-term nucleation phase to a major rupture, within the highly coupled Central Chile zone where a megathrust earthquake like 1730 is expected.
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Submitted on : Wednesday, August 10, 2022 - 11:29:30 AM
Last modification on : Tuesday, October 25, 2022 - 12:49:19 PM
Long-term archiving on: : Friday, November 11, 2022 - 6:37:28 PM

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S. Ruiz, F. Aden-Antoniow, J. C. Baez, C. Otarola, B. Potin, et al.. Nucleation Phase and Dynamic Inversion of the Mw 6.9 Valparaíso 2017 Earthquake in Central Chile. Geophysical Research Letters, 2017, 44, pp.10,290-10,297. ⟨10.1002/2017GL075675⟩. ⟨insu-03748835⟩

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