Improvement of precision of waveform of the coherent seismic wave tomography method

相干地震波层析成像方法波形精度的提高

• 批准号: 11450172
• 负责人: HIGASHIHARA Hiromichi
• 金额: $ 8.58万
• 依托单位: 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: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11450172/
• 关键词: physical prospecting; controlled sources; earthquake prediction; elastic wave tomography; seismic motion

We have developed an active seismic underground tomography system based on a new-brand idea. In 1999 fiscal year, we designed and manufactured an advanced model of rotary seismic source that has much more capability than the old one. We had planed to deploy the new source in a test field in 2000 fiscal year ; it appeared soon that this deployment needs a lot of budget fund, though, because the experience of another trial of a rotary seismic source done by Nagoya University revealed that the continuity between the source and the supporting ground required a careful introduction of the anchorage devices. Fortunately, another research plan that aimed the deployment was accepted elsewhere and we could submit the present fund to the original target, improvement of the ability of the system.(1) Phased array of sources that realizes the coherent wave field requires not only the control of its velocity but also the control of its position. We realized this position control through a combination of an optical sensor and the encoder of the motor.(2) We carried out a laboratory experiment of scattering of elastic wave in rock specimens. The objective of this experiment was to provide materials to construction of models of scattering of elastic wave through stress concentration in the ground ; good scattering models are supposed to support inversion calculations.(3) We also analyzed mathematically the elastic wave in layered ground and established a formula that described the transformation to the emitted elastic wave energy from the electromagnetic energy submitted into the motor.

基于一种全新的思路，我们研制了一种主动式地下地震层析成像系统。在1999财政年度，我们设计和制造了一个先进的模型旋转震源，具有更大的能力比旧的。我们曾计划在2000财政年度在试验场部署新震源;但很快就发现，这种部署需要大量的预算资金，因为名古屋大学进行的另一次旋转震源试验的经验表明，震源和支撑地面之间的连续性需要小心地引入锚固装置。幸运的是，另一个针对部署的研究计划在其他地方被接受，我们可以将目前的资金提交给最初的目标，提高系统的能力。(1)实现相干波场的相控震源阵列不仅要求控制其速度，而且要求控制其位置。我们通过光学传感器和电机编码器的组合实现了这种位置控制。(2)我们进行了岩石试件中弹性波散射的室内实验。本实验的目的是提供材料的建设模型的弹性波散射通过应力集中在地面;良好的散射模型应该支持反演计算。(3)对层状地基中的弹性波进行了数学分析，建立了电磁能量向发射弹性波能量转化的公式。

项目成果

M.Hori et al.: "Prediction of stress field in Japan using GPS network data"Earth Planets Space. 52. 1101-1105 (2000)

M.Hori 等人：“使用 GPS 网络数据预测日本的应力场”地球行星空间。

Higashihara, H.and Shiogama Y.: "Development of a new, high precision harmonic seismic wave tomography method"Proc.fourth European Conf.Structural Dynamics. Vol.1. 593-598 (1999)

Higashihara, H. 和 Shiogama Y.：“开发一种新的高精度谐波地震波断层扫描方法”Proc.第四届欧洲结构动力学会议。

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。

東平光生: "Hyperfunction の概念を用いたスカラー成層波動場のGreen関数のスペクトル表現の誘導"応用力学論文集. vol.2. 485-493 (1999)

Mitsuo Tohira：“使用超函数概念归纳标量分层波场的格林函数的光谱表示”《应用力学杂志》第 2 卷（1999 年）。

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。