التفاصيل البيبلوغرافية
| العنوان: |
Nucleation Phase and Dynamic Inversion of the Mw 6.9 Valparaíso 2017 Earthquake in Central Chile. |
| المؤلفون: |
Ruiz, S., Aden-Antoniow, F., Baez, J. C., Otarola, C., Potin, B., Campo, F., Poli, P., Flores, C., Satriano, C., Leyton, F., Madariaga, R., Bernard, P. |
| المصدر: |
Geophysical Research Letters; 10/28/2017, Vol. 44 Issue 20, p10,290-10,297, 8p |
| مستخلص: |
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. [ABSTRACT FROM AUTHOR] |
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