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Title: Constraining the source of the Mw 8.1 Chiapas, Mexico earthquake of 8 September 2017 using teleseismic and tsunami observations
Authors: Heidarzadeh, M
Ishibe, T
Harada, T
Issue Date: 9-Apr-2018
Citation: Heidarzadeh, M., Ishibe, T. and Harada, T. (2018) 'Constraining the Source of the Mw 8.1 Chiapas, Mexico Earthquake of 8 September 2017 Using Teleseismic and Tsunami Observations', Pure and Applied Geophysics, 175, pp. 1925 - 1938. doi: 10.1007/s00024-018-1837-6.
Abstract: Copyright © The Author(s) 2018. The September 2017 Chiapas (Mexico) normal-faulting intraplate earthquake (Mw 8.1) occurred within the Tehuantepec seismic gap offshore Mexico. We constrained the finite-fault slip model of this great earthquake using teleseismic and tsunami observations. First, teleseismic body-wave inversions were conducted for both steep (NP-1) and low-angle (NP-2) nodal planes for rupture velocities (Vr) of 1.5–4.0 km/s. Teleseismic inversion guided us to NP-1 as the actual fault plane, but was not conclusive about the best Vr. Tsunami simulations also confirmed that NP-1 is favored over NP-2 and guided the Vr = 2.5 km/s as the best source model. Our model has a maximum and average slips of 13.1 and 3.7 m, respectively, over a 130 km × 80 km fault plane. Coulomb stress transfer analysis revealed that the probability for the occurrence of a future large thrust interplate earthquake at offshore of the Tehuantepec seismic gap had been increased following the 2017 Chiapas normal-faulting intraplate earthquake.
ISSN: 0033-4553
Appears in Collections:Dept of Mechanical and Aerospace Engineering Research Papers

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