Field deployment of coherent seismic wave tomography system (ACROSS)

相干地震波层析成像系统（ACROSS）现场部署

• 批准号: 12555133
• 负责人: HIGASHIHARA Hiromichi
• 金额: $ 8.45万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12555133/
• 关键词: physical prospecting; controlled sources; earthquake prediction; elastic wave tomography; seismic motion; coherent; inversion; monitoring; 地下探査; 制御震源; 地震予知; 弾性波トモグラフィ; 地震動シミュレーション

We have been developing a brand-new active seismic underground tomography system. In spite of its great success, conventional seismic tomography, which is based on impulsive sources, has been suffering lack of resolution ; we have initiated an alternative method on the basis of accurate harmonic wave and developed coherent technologies to monitor the underground. Our seismic source is an eccentric mass driven by a servomotor. We run this emitter and measure the induced ground motion. Repeating the measurement for a range of different frequencies, we get frequency transfer function. Its Fourier transform yields impulse transfer function, which enables the conventional seismological wave analysis.In 2000 fiscal year, we manufactured an advanced model of rotary seismic source with much more power than the foregoing model and deployed instruments in a deep enormous tunnel network of around 600m deep and 3000m wide. This was located in a high seismicity place where moderate size earthquakes of around magnitude six often occur. Detection of change of crustal properties is expected to be a good exercise of our system. In 2001 fiscal year, we extended and reinforced the test field through an intensive network of seismometers and strainmeters.

我们一直在开发一种全新的主动式地下地震层析成像系统。尽管它的巨大成功，传统的地震层析成像，这是基于脉冲源，一直遭受缺乏分辨率，我们已经发起了一个替代方法的基础上准确的谐波和发展相干技术来监测地下。我们的震源是一个偏心质量体，由一个驱动器驱动。我们运行这个发射器并测量引起的地面运动。对一系列不同的频率重复测量，得到频率传递函数。在2000年度，我们制造了比上述模型功率更大的旋转震源的先进模型，并在深约600米、宽约3000米的大型隧道网络中部署了仪器。这是一个高地震活动的地方，经常发生6级左右的中等规模地震。探测地壳性质的变化预计将是我们系统的一个很好的练习。在2001财政年度，我们通过密集的地震仪和应变仪网络扩大和加强了试验场。

项目成果

H. Higashihara et al.: "Development of a new coherent seismic wave tomography method"Proc. Fourteenth Engineering Mechanics Conference, ASCE. 1-6 (2000)

H. Higashihara 等人：“开发一种新的相干地震波断层扫描方法”Proc。

佐伯昌之: "調和弾性波トモグラフィにおける周波数精度と分解能の定量的分析"応用力学論文集. Vol.4. 467-474 (2001)

Masayuki Saeki：“谐波弹性波断层扫描中频率精度和分辨率的定量分析”应用力学杂志，第 4 卷，467-474（2001 年）。

T. Touhei: "A scattering problem by means of the special representation of Green's function for a layerd acoustic half-space"Computational Mechanics. 25. 477-488 (2000)

T. Touhei：“通过分层声学半空间格林函数的特殊表示来解决散射问题”计算力学。

Saeki M.: "Analysis of harmonic seismic wave fields as a basis of new tomography method"Wave 2000, Balkema. 399-408 (2000)

Saeki M.：“作为新断层扫描方法基础的谐波地震波场分析”Wave 2000，Balkema。

M. Saeki, and H. Higashihara: "Analysis of harmonic seismic wave field as a basis of new tomography method"Proc. International Workshop WAVE2000. 399-408 (2000)

M. Saeki 和 H. Higashihara：“谐波地震波场分析作为新断层扫描方法的基础”Proc。