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Abstract:
The Kuril Islands trench has produced major tsunami events that have propagated towards different coastal areas in the Pacific Ocean basin. A tsunami wave inversion is performed to characterize the initial sea surface distribution triggered by the 2020 Kuril Islands earthquake (Mw 7.5). The tsunami generated by the earthquake caused a small appreciable tsunami wave at stations 21415, 21416 and 21419 of the DART network. To calculate the elementary waveforms (Green's functions) associated with each subfault and station, tsunami simulations are performed using the EasyWave code (Babeyko, 2012). This formulation solves the shallow water linear equations on a grid in spherical coordinates. A GEBCO bathymetry with a resolution of 30 arc-sec (~900 m) is used and a 90-minute propagation period of the tsunami is simulated. Once the Green's functions have been calculated, we proceed to solve the linear system using the algorithm of least squares following the method developed by Tsushima et al. (2009). Tsunami waves on DART buoys are adequately reproduced. The results are compared with the waveforms based on the finite fault solution obtained by the United States Geological Survey.
