Study of the inhomogeneous structure of the earth from the analysis of scattering phenomena of broad band seismic waves
从宽带地震波散射现象分析研究地球的不均匀结构
基本信息
- 批准号:15540399
- 负责人:
- 金额:$ 2.05万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (C)
- 财政年份:2003
- 资助国家:日本
- 起止时间:2003 至 2004
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Study of inhomogeneous structure of the earth medium is important for understanding the evolution process of the earth. We performed three seismological studies as follows : 1.Small-scale inhomogeneity of the lithosphere based on the analysis of high-frequency seismic waves : Combining the radiative transfer theory and the Markov approximation, we constructed a hybrid model for the synthesis of the whole scalar-wave envelope in 2-D random media. Extending the Markov approximation for vector wave propagation in 2-D elastic random media, we proposed a new synthesis model, which quantitatively explains envelopes synthesized by the finite difference simulation. Scattering due to random inhomogeneity well explains the peak amplitude decay and the envelope broadening observed. Strong scattering beneath Quaternary volcanoes was revealed from the envelope broadening analysis in Tohoku district. We made the depth profile of the Moho and the subducting Philippine-sea plate in Chugoku-Shikoku dis … More trict by using the receiver function method. 2.Scattering characteristics in the mantle from the analysis of ScS phase in intermediate periods : Analyzing wave envelopes around the ScS phase of regional earthquakes by using the isotropic scattering model based on PREM, we first estimated quantitatively the scattering coefficient in the mantle for periods from 4 to 10 s. 3.Envelope analysis of long period Rayleigh waves : We analyzed vertical-component seismograms of large earthquakes in long periods recorded by IRIS and F-net. The array analysis revealed that the fundamental mode Rayleigh waves dominate early lapse times but higher modes dominate as lapse time increases because of small attenuation in the lower mantle. We find that the coda attenuation factor directly represents the attenuation factor in the lower mantle. Clarifying the scattering characteristics between Rayleigh waves and body waves in random elastic half media, we established the solid base for the envelope synthesis in long periods. Less
研究地球介质的非均质结构对于理解地球的演化过程具有重要意义。我们进行了以下三项地震学研究: 1.基于高频地震波分析的岩石圈小尺度不均匀性:结合辐射传输理论和马尔可夫近似,构建了二维随机介质中全标量波包络合成的混合模型。扩展二维弹性随机介质中矢量波传播的马尔可夫近似,我们提出了一种新的合成模型,该模型定量地解释了通过有限差分模拟合成的包络。由于随机不均匀性引起的散射很好地解释了观察到的峰值振幅衰减和包络变宽。东北地区的包络线展宽分析揭示了第四纪火山下方的强烈散射。利用接收函数法,对中国-四国地区莫霍面和俯冲菲律宾海板块的深度剖面进行了精确的绘制。 2.中期ScS相分析地幔中的散射特征:利用基于PREM的各向同性散射模型对区域地震ScS相周围的波包络进行分析,首先定量估计了4~10s周期地幔中的散射系数。 3.长周期瑞利波包络分析:我们分析了IRIS和F-net记录的长周期大地震的垂直分量地震图。阵列分析表明,基本模式瑞利波在早期的流逝时间中占主导地位,但随着流逝时间的增加,由于下地幔中的衰减较小,更高的模式占主导地位。我们发现尾波衰减因子直接代表下地幔的衰减因子。阐明了随机弹性半介质中瑞利波和体波的散射特性,为长周期包络合成奠定了坚实的基础。较少的
项目成果
期刊论文数量(34)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Laboratory Study on Scattering Characteristics of Shear Waves in Rock Samples
- DOI:10.1785/0120020074
- 发表时间:2003-02
- 期刊:
- 影响因子:3
- 作者:Y. Fukushima;O. Nishizawa;H. Sato;M. Ohtake
- 通讯作者:Y. Fukushima;O. Nishizawa;H. Sato;M. Ohtake
Shiomi K., H.Sato, K.Obara 1, M.Ohtake: "Configuration of Subducting Philippine Sea Plate beneath Southwest Japan Revealed from Receiver Function Analysis Based on the Multivariate AR Model"Journal of Geophysical Research, Solid-Earth. (印刷中). (2004)
Shiomi K.、H.Sato、K.Obara 1、M.Ohtake:“基于多元 AR 模型的接收函数分析揭示了日本西南部俯冲菲律宾海板块的构造”地球物理研究杂志,固体地球(印刷版) (2004)
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
Unified explanation of envelope broadening and maximum‐amplitude decay of high‐frequency seismograms based on the envelope simulation using the Markov approximation: Forearc side of the volcanic front in northeastern Honshu, Japan
- DOI:10.1029/2004jb003225
- 发表时间:2005
- 期刊:
- 影响因子:0
- 作者:Tatsuhiko Saito;H. Sato;M. Ohtake;K. Obara
- 通讯作者:Tatsuhiko Saito;H. Sato;M. Ohtake;K. Obara
Simulating the Envelope of Scalar Waves in 2D Random Media Having Power-Law Spectra of Velocity Fluctuation
- DOI:10.1785/0120020105
- 发表时间:2003-02
- 期刊:
- 影响因子:3
- 作者:Tatsuhiko Saito;H. Sato;M. Fehler;M. Ohtake
- 通讯作者:Tatsuhiko Saito;H. Sato;M. Fehler;M. Ohtake
Lee W.S., H.Sato, K.H.Lee: "Estimation of S-wave scattering coefficient in the mantle from envelope characteristics before and after the ScS arriva"Geophysical Research Letters. 30・24. 2248,doi:10.1029/2003GL018413 (2003)
Lee W.S.、H.Sato、K.H.Lee:“根据 ScS 到达前后的包络线特征估算地幔中的 S 波散射系数”地球物理研究快报 30・24,doi:10.1029/2003GL018413(2003)。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
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SATO Haruo其他文献
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{{ truncateString('SATO Haruo', 18)}}的其他基金
Study on seismic wave propagation through the heterogeneous structure and the Green function retrieval from the noise cross correlation
地震波通过非均质结构传播及噪声互相关格林函数反演研究
- 批准号:
24540448 - 财政年份:2012
- 资助金额:
$ 2.05万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Study on scattering and seismic-wave envelopes in short-periods in the heterogeneous medium
非均质介质中短周期散射和地震波包络研究
- 批准号:
21540426 - 财政年份:2009
- 资助金额:
$ 2.05万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Study on the non-uniform and non-isotropic inhomogeneous structure of the lithosphere by using short-period seismic waves
利用短周期地震波研究岩石圈非均匀非各向同性非均质结构
- 批准号:
19540435 - 财政年份:2007
- 资助金额:
$ 2.05万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Study on medium heterogeneity beneath island arcs based on the analysis of seismic wave scattering
基于地震波散射分析的岛弧下介质非均质性研究
- 批准号:
17540389 - 财政年份:2005
- 资助金额:
$ 2.05万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
The research about the possibility of the outsourcing for the cooperation between the school and the local coinmunity
学校与地方合作外包的可能性研究
- 批准号:
13610320 - 财政年份:2001
- 资助金额:
$ 2.05万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Study on scattering of seismic waves in the heterogeneous structure of the earth and their envelope formation
地震波在地球非均质结构中的散射及其包络形成研究
- 批准号:
12640400 - 财政年份:2000
- 资助金额:
$ 2.05万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
エネルギー輸送理論に基づく高周波数地震波形エンベロープの研究
基于能量传输理论的高频地震波形包络研究
- 批准号:
09640502 - 财政年份:1997
- 资助金额:
$ 2.05万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Study of Attenuation Mechanism of Seismic Waves in the Crust
地震波在地壳中的衰减机制研究
- 批准号:
05680355 - 财政年份:1993
- 资助金额:
$ 2.05万 - 项目类别:
Grant-in-Aid for General Scientific Research (C)
Study of the inhomogeneous structure in the subduction zone based on the analysis of seismogram envelopes
基于地震记录包络分析的俯冲带非均质结构研究
- 批准号:
03640359 - 财政年份:1991
- 资助金额:
$ 2.05万 - 项目类别:
Grant-in-Aid for General Scientific Research (C)
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