Estimation of the source process and forward simulation of long-period ground motion of the 2018 Hokkaido Eastern Iburi, Japan, earthquake
説明
<jats:title>Abstract</jats:title><jats:p>In this study, we investigate the source rupture process of the 2018 Hokkaido Eastern Iburi earthquake in Japan (<jats:italic>M</jats:italic><jats:sub>JMA</jats:sub>6.7) and how the ground motion can be reproduced using available source and velocity models. First, we conduct a multiple-time-window kinematic waveform inversion using strong motion waveforms, which indicates that a large slip area located at a depth of 25–30 km in the up-dip direction from the hypocenter was caused by a rupture propagating upward 6–12 s after its initiation. Moreover, the high-seismicity area of aftershocks did not overlap with the large-slip area. Subsequently, using the obtained source model and a three-dimensional velocity structure model, we conduct a forward long-period (< 0.5 Hz) ground-motion simulation. The simulation was able to reproduce the overall ground-motion characteristics in the sedimentary layers of the Ishikari Lowland.</jats:p>
収録刊行物
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- Earth, Planets and Space
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Earth, Planets and Space 72 (1), 20-, 2020-02-18
Springer Science and Business Media LLC
