Tuning the deep velocity structure model by 1-D simulation of long-period S- waves

Tuning the deep velocity structure model by 1-D simulation of long-period S- waves
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通过长周期横波的一维模拟调整深层速度结构模型

DOI:
10.1190/segj092009-001.12
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发表时间:
2009
期刊:
Earth, Planets and Space
影响因子:
--
通讯作者:
N. Takai
N. Takai
中科院分区:
--
文献类型:
--
作者:
Y. Dhakal;T. Sasatani;N. Takai

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在大盆地地区,地震基底上方的深层沉积层(S波速度~ 3 km/s)对长周期强地震动的振幅和持续时间有很大的控制作用。最近,国家地球科学和灾害预防研究所(NIED)开发了日本几个地区的速度结构模型,作为日本地震危险性测绘项目的一部分。大盆地地区的NIED速度结构需要根据观测到的地震记录特征进行调整,以便进行强地面运动预测。一般而言,深盆地结构的三维模拟中盆地场地处的直达S波与场地正下方平坦层结构的一维模拟中的直达S波基本相同。根据这一事实,我们提出了一个改进的调谐的深层速度结构与长周期S波的一维模拟。所观察到的长周期S-波形与合成的长周期S-波形从1-D模拟假设一个试探性的平层结构就在下面的网站。在这种比较中,重要的是基于S波放大因子来选择带通滤波器的适当带宽。重复该过程,直到两个S波形合理地拟合。我们应用这种调整方法的NIED模型的十胜盆地位于日本北海道东部。
Deep sedimentary layers above the seismic basement (Swave velocity ~ 3 km/s) greatly control the amplitude and duration of long-period strong ground motions in large basin areas. Recently, National Research Institute for Earth Science and Disaster Prevention (NIED) has developed velocity structure models in several regions of Japan as part of seismic hazard mapping projects in Japan. The NIED velocity structures in large basin areas need to be adjusted based on the observed features of earthquake records for the prediction of strong ground motions. In general, direct S-wave at a basin site from 3D simulation for a deep basin structure is essentially the same as that from 1-D simulation for a flat layer structure just beneath the site. According to this fact, we propose an improvement in tuning the deep velocity structure with 1-D simulation of long-period S-waves. The observed long-period S-waveform is compared with the synthetic long-period S-waveform from 1-D simulation assuming a tentative flat layer structure just beneath the site. In this comparison, it is important to select an appropriate band-width of the bandpass filter based on the S-wave amplification factors. This process is repeated until both S-waveforms fit reasonably. We apply this tuning method to the NIED model of the Tokachi basin located in the eastern Hokkaido, Japan.
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DOI: --
发表时间: 2009
期刊: Tectonophysics 472
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DOI: --
发表时间: 2009
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作者:
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