Numerical modeling of the 2015 Illapel Tsunami source by the inversion of DART buoys data

3rd National scientific conference with foreign participants "Geodynamical Processes and Natural Hazards"

生态环境科学

Voronina, T.A.^1 ; Loskutov, A.V.^2^3

Institute of Computational Mathematics and Mathematical Geophysics of SB RAS, Pr.Ac.Lavrentieva, 6, Novosibirsk

630090, Russia^1

Institute of Marine Geology and Geophysics of FEB RAS, Nauki st. 1B, Yuzhno-Sakhalinsk

693022, Russia^2

Institute of Oceanology Im. P.Shirshov of the Russian Academy of Sciences, Nakhimovsky Prospekt, 36, Moscow

117997, Russia^3

关键词: Earthquake source;    Mathematical physics;    Numerical instability;    Numerical solution;    Remote measurement;    Shallow water theory;    Source reconstruction;    Waveform inversion;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/324/1/012015/pdf
DOI  :  10.1088/1755-1315/324/1/012015

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The problem of the tsunami source reconstruction from the remote measurements of an arriving waves in the deep-water tsunamimeters is considered as an inverse problem of mathematical physics in the class of the ill-posed problems. The latter determines the inevitable instability of the numerical solution. We propose a method providing more control on the numerical instability of the solution. The DART buoys data allows one to apply the linear shallow-water theory for the wave propagation and the r-solution method for the tsunami waveform inversion. The applied approach is independent from the earthquake source characteristics, because the only observed tsunami waveforms and a roughly estimated tsunami source area are used. A good coincidence of observed and computed tsunami waveforms was a criterion of the quality of the inversion. In this paper we study the 16 September 2015 Illapel (Chile) event and conduct a reconstruction of a tsunami source.