Time Reversal Imaging of the 2014 Iquique Tsunami Source

Jiayuan Han, & Lingsen Meng

Published August 14, 2017, SCEC Contribution #7639, 2017 SCEC Annual Meeting Poster #202

The 2014 Mw 8.2 Iquique earthquake occurred off the coast of northern Chile, generating a tsunami with a maximum runup height of 1.75 meters. The slip distributions are highly variable depending on the choice of the dataset and inversion methods. Time reversal imaging aims at reconstructing the initial water elevation by back-propagation and constructive interference of the recorded tsunami waveforms. Time reversal imaging provides independent verification of the finite-fault models without relying on any prior assumptions of the fault geometry nor on restrictive parameterization of the rupture kinematics. In this study, we adopted 22 DART or coastal gauge stations in the time reversal analysis. In addition to the geometrical corrections that scale the wave amplitude at each station to account for the 2d spreading effects, we also introduce an amplitude weight for each station to account for azimuthal variation of the stations density. We compare our results with the initial deformation predicted by several published finite-fault models. It shows that our results is similar with Hayes’ slip model in the location of peak water elevation and shape.

Key Words
Iquique, Time Reversal, Tsunami, Slip Model

Citation
Han, J., & Meng, L. (2017, 08). Time Reversal Imaging of the 2014 Iquique Tsunami Source. Poster Presentation at 2017 SCEC Annual Meeting.

Related Projects & Working Groups
Fault and Rupture Mechanics (FARM)