DEVELOPMENT OF REAL-TIME GEOPHYSICAL EXPLORATION SYSTEM BASED ON ARRAY OBSERVATION OF THREE-COMPONENT MICROTREMORS

基于三分量微震阵列观测的实时地球物理勘探系统开发

• 批准号: 08555140
• 负责人: TOKIMATSU Kohji
• 金额: $ 3.01万
• 依托单位: TOKYO INSTITUTE OF TECHNOLOGY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08555140/
• 关键词: Microtremors; Array observation; Surface waves; Rayleigh waves; Love waves; Shear wave profile; Amplification; F-k spectrum analysis; 地震探査

Field techniques and analytical procedures have been presented for geotechnical site characterization using microtremor three-component ground motions, in addition to their applicability for evaluating spatial variation of soil profiles and ground motion characteristics. The present system can readily provide Rayleigh- and Love-wave dispersion curves as well as H/V spectra from spectrum analyzes of microtremor three-component ground motions. The dispersion curves and H/V spectra of surface waves have been theoretically derived in which the effects of higher-modes can be taken into account. Inverse analyzes using both Rayleigh-wave dispersion curve and Love-wave dispersion curve or H/V spectra have been presented for determining shear wave velocity profiles.It is shown that :(1) The theoretical dispersion curve of Rayleigh waves shows a good agreement with those determined by te F-k spectrum analysis of the microtremor vertical motions in any case.(2) The theoretical dispersion curve of … More Love waves shows a good agreement with those determined by the F-k spectrum analysis of the microtremor transverse horizontal motions, if microtremors propagate from one direction.(3) The proposed H/V spectrum of surface waves shows a good agreement with observed microtremor H/V spectrum, claiming its validity.(4) The proposed inversion process using both Rayleigh-wave dispersion curve and Love-wave dispersion curve or H/V spectra can yield more reliable shear wave velocity profiles than that using Rayleigh-wave dispersion curve only.To demonstrate the effectiveness of the proposed methods, microtremor measurements using arrays are conducted in Kushiro and Kobe and the shear structures in those areas are estimated down to depths of about 50 m and 1.5 km, respectively. The estimated shear structures are in good agreement with those determined by the conventional methods, indicating the effectiveness of the proposed method. Effective stress response analysis is then made using the estimated soil profiles. The computed distribution of the peak ground velocity and acceleration as well as the transfer funcion between stations are consistent with those observed during the earthquakes, suggesting that the proposed methods are promising. Less

除了评估土壤剖面和地面运动特征的空间变化外，还使用微晶状体三组分地面运动提出了现场技术和分析程序，用于使用微晶状体三组分地面运动来进行岩土。目前的系统可以轻松地提供瑞利和爱波色散曲线以及微移动三组分接地运动的光谱分析中的H/V光谱。从理论上得出了表面波的分散曲线和H/V光谱，其中可以考虑较高模型的影响。已经提出了使用瑞利波散分散曲线和爱情波散曲线或H/V光谱的逆分析，用于确定剪切波速度曲线。这表明：（1）雷利波的理论分散曲线表明，与te f-k Spectrions verions verions verions commore canse cormitions cormitions cormive cormition cormive cormitions cormive cormive cormive corvieres corvieres corvieres corvieres corvieres corvie corvie cormive corvieres corvieres corvieres corvie corvie corvie core cormitive corvie（2）如果微晶体从一个方向传播，则与通过F-K频谱分析确定的良好一致，该分析是横向水平运动的。（3）提出的表面波的H/V光谱显示出与观察到的微晶状体H/V光谱的良好一致性，并使用了拟议的求职者，并声称其有效性。 H/V光谱比仅使用Rayleigh-Wave分散曲线的剪切波速度曲线可以产生更可靠的剪切波速度。为了证明所提出的方法的有效性，使用阵列进行微生物测量值，在Kushiro和Kobe和Kobe以及这些区域的剪切结构进行了估计估计高达50 m和1.5 km和1.5 km和1.5 km和1.5 km和1.5 km和1.5 km。估计的剪切结构与由常规方法确定的剪切结构非常吻合，表明该方法的有效性。然后使用估计的土壤谱进行有效的应力反应分析。峰值接地速度和加速度的计算分布以及站点之间的转移功能与地震期间观察到的分布一致，这表明提出了建议的方法。较少的

项目成果

田村 修次: "3次元多層地盤上の水平点加振源から発生する実体波の距離減衰" 第32回地盤工学研究発表会. 859-860 (1997)

Shuji Tamura：“三维多层地面上水平点激励源产生的体波的距离衰减”第 32 届岩土工程研究会议 859-860（1997 年）。

Arai, H.: "Comparison of Local Amplifications Estimated from Microtremor F-k Spectrum Analysis with Earthquake Records" Proc.,11th World Conf.on Earthquake Engineering. CD-ROM,3. 8 (1996)

Arai, H.：“根据微动 F-k 频谱分析估计的局部放大与地震记录的比较”Proc.，第 11 届世界地震工程大会。

Tokimatsu, K., Arai, H., and Asaka, Y.: "Deep Shear-Wave Structure and Earthquake Ground Motion Characteristics in Sumiyoshi Area, Kobe City, Based on Microtremor Measurements" Jour.of Structural and Construction Engineering, AIJ. No.491. 37-45 (1997)

Tokimatsu, K.、Arai, H. 和 Asaka, Y.：“基于微震测量的神户市住吉地区的深层剪切波结构和地震地震动特征”Jour.of Structural and Construction Engineering，AIJ。

Kohji TOKIMATSU: "Two-dimensional Shear Wave Structure and Motion Characteristics in Kobe Based on Microtremor Measurements" Geotechnical Earthquake Engineering and Soil Dynamics 3rd Conference,August 3-6, Seattle, Washington, GEO-INSTITUTE ASCE 1998. (発表

Kohji TOKIMATSU：“基于微震测量的神户二维剪切波结构和运动特征”岩土地震工程和土壤动力学第三次会议，8 月 3-6 日，华盛顿州西雅图，GEO-INSTITUTE ASCE 1998。（演示文稿）

田村 修次: "3次元多層地盤における地中水平点加振の応答変位にしめる表面波と実体波の割合" 日本建築学会大会学術講演梗概集. 237-238 (1997)

Shuji Tamura：“三维多层地面中水平点激励的响应位移中的表面波和体波之比”日本建筑学会会议学术讲座摘要237-238（1997）。