Strong Motion Simulation of Valparaiso 2017 Mw 6.9 Chile earthquake using a hybrid method.
Abstract
Valparaíso 2017 earthquake occurred in Central Chile, an active zone where the last mega-thrust earthquake occurred in 1730. During the last years, Central Chile has been well instrumented by seismological instruments deployed by the National Seismological Center of the Universidad de Chile (CSN). The 2017 Valparaiso earthquake was well recorded by strong motion instruments placed in near field. The largest peak ground acceleration recorded was around 40 % g and the strong shake was felt at large distances. Here we preformed kinematic and dynamic inversions to produce an image of Valparaíso earthquake rupture. Then, we use the proposed finite fault to simulate strong motion records. We generate hybrid accelerograms using for low frequency deterministic methods and for high frequency stochastic methods. Additionally, the local geotechnical characteristics are considered incorporating the soil transfer function for every place of interest. Finally, we reproduce in a broad range of frequencies the accelerograms of Mw 6.0 Valparaíso 2017. Our simulated acceleration time histories show similarity in time and frequency with the acceleration record for the frequency band between 0.04 Hz to 20 Hz.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFM.T43E0441B
- Keywords:
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- 1207 Transient deformation;
- GEODESY AND GRAVITYDE: 7215 Earthquake source observations;
- SEISMOLOGYDE: 8123 Dynamics: seismotectonics;
- TECTONOPHYSICSDE: 8170 Subduction zone processes;
- TECTONOPHYSICS