Estimation of the source process and forward simulation of long-period ground motion of the 2018 Hokkaido Eastern Iburi, Japan, earthquake

Estimation of the source process and forward simulation of long-period ground motion of the 2018 Hokkaido Eastern Iburi, Japan, earthquake
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2018年日本北海道胆振东部地震震源过程估计及长周期地震动正演模拟

DOI:
10.1186/s40623-019-1079-6
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发表时间:
2019
期刊:
Earth, Planets and Space
影响因子:
--
通讯作者:
H. Sekiguchi
H. Sekiguchi
中科院分区:
--
文献类型:
--
作者:
H. Kubo;A. Iwaki;W. Suzuki;S. Aoi;H. Sekiguchi

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在这项研究中,我们研究了2018年日本北海道东伊武里地震(MJMA 6.7)的震源破裂过程,以及如何利用现有的震源和速度模型再现地面运动。首先,我们利用强震波形进行了多时间窗的运动学波形反演,结果表明,在离震源上倾方向25-30 km深度的大滑移区是由破裂发生后6-12 s向上传播造成的。此外,余震的高地震活动性区与大滑动区没有重叠。随后,利用得到的震源模型和三维速度结构模型,进行了正演长周期(< 0.5 Hz)地震动模拟。该模拟能够再现石kari低地沉积层的整体地面运动特征。
In this study, we investigate the source rupture process of the 2018 Hokkaido Eastern Iburi earthquake in Japan (MJMA 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.
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发表时间: 2008-07
影响因子: --
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