Rupture Process During the <i>M</i><sub><i>w</i></sub> 8.1 2017 Chiapas Mexico Earthquake: Shallow Intraplate Normal Faulting by Slab Bending

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  • R. Okuwaki
    Graduate School of Life and Environmental Sciences University of Tsukuba Tsukuba Japan
  • Y. Yagi
    Faculty of Life and Environmental Sciences University of Tsukuba Tsukuba Japan

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<jats:title>Abstract</jats:title><jats:p>A seismic source model for the <jats:italic>M</jats:italic><jats:sub><jats:italic>w</jats:italic></jats:sub> 8.1 2017 Chiapas, Mexico, earthquake was constructed by kinematic waveform inversion using globally observed teleseismic waveforms, suggesting that the earthquake was a normal‐faulting event on a steeply dipping plane, with the major slip concentrated around a relatively shallow depth of 28 km. The modeled rupture evolution showed unilateral, downdip propagation northwestward from the hypocenter, and the downdip width of the main rupture was restricted to less than 30 km below the slab interface, suggesting that the downdip extensional stresses due to the slab bending were the primary cause of the earthquake. The rupture front abruptly decelerated at the northwestern end of the main rupture where it intersected the subducting Tehuantepec Fracture Zone, suggesting that the fracture zone may have inhibited further rupture propagation.</jats:p>

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