OBSERVATIONAL RESEARCH ON CRUSTAL STRUCTURE AROUND M6.1 EARTHQUAKE FAULT

M6.1地震断层周边地壳结构观测研究

基本信息

  • 批准号:
    13440128
  • 负责人:
  • 金额:
    $ 8.13万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
  • 财政年份:
    2001
  • 资助国家:
    日本
  • 起止时间:
    2001 至 2003
  • 项目状态:
    已结题

项目摘要

We investigate temporal changes of crustal structure around the 1998 M6.1 earthquake occurred south west of Volcano Iwate by analyzing seismic signals excited by artificial seismic experiments from 1998 to 2003 and by analyzing seismic waves of earthquake families occurring on the Pacific plate boundary. The seismic signals excited by the active shots were recorded by short period and broad band seismometers installed at permanent stations (GNB, ANS, AKM) of Tohoku University and a temporal station (MTI). We estimate phase difference of nearby two seismograms for the six shots by using a cross spectrum method. Then, we evaluate the seismic velocity changes of the structure during the two shots. The results show that the seismic velocity decreases about 1.5% at MTI and GNB stations, which are located at the northern edges of the fault, for shot 1 and shot 2, during which the M6.1 earthquake occurred. Then, the seismic velocity increases of about 0-0.5% is observed for the data from 1998 (after the M6.1 eq.) to 2002. From 2002 to 2003, about 0.3% velocity increase is observed again. Cross-correlation analyses of the earthquake families also show a significant temporal change of heterogeneity around the M6.1 earthquake and Volcano Iwate. We infer that these changes in shallow that are observed from 1998 to 2002 are related to stress release and accumulation of the M6.1 earthquakes and/or structure changes due to the intense volcanic activity of Mt Iwate at this period. We further determined a three-dimensional P-wave velocity structure around the M6.1 earthquake and the spatial distribution of slip and high-frequency wave radiation zone for the M6.1 earthquakes.
通过对1998年至2003年岩手岛火山西南6.1级地震前后人工地震试验激发的地震信号的分析和太平洋板块边界地震族地震波的分析,研究了1998年岩手岛火山西南6.1级地震前后地壳结构的时间变化。用安装在东北大学常设台(GNB、ANS、AKM)和临时台(MTI)的短周期宽带地震仪记录了活动炮击激发的地震信号。我们用交叉谱的方法估计了六次激发的相邻两条地震记录的相位差。然后,我们评估了两次激发过程中结构的地震速度变化。结果表明,6.1级地震发生时,位于断层北缘的MTI台和GNB台的震源1和炮点2的地震速度下降了约1.5%。从1998年(6.1级地震后)开始,观测到地震波速增加了约0-0.5%。到2002年。从2002年到2003年,又出现了约0.3%的速度增长。地震家族的互相关分析也表明6.1级地震和岩手岛火山前后的非均质性存在显著的时间变化。我们推测,1998-2002年观测到的这些浅层变化与6.1级地震的应力释放和积累和/或岩手山强烈的火山活动引起的构造变化有关。进一步确定了6.1级地震前后的三维P波速度结构和6.1级地震的滑动和高频波辐射区的空间分布。

项目成果

期刊论文数量(24)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Nakahara, H., T.Nishimura, H.Sato, M.Ohtake, S.Kinoshita, H.Hamaguchi: "Broad-band source process of the 1998 Iwate Prefecture, Japan, earthquakes as revealed from inversion analyses of seismic waveforms and evnelope"Bull.Soc.Seis.Am.. 92. 1708-1720 (2002
Nakahara, H., T.Nishimura, H.Sato, M.Ohtake, S.Kinoshita, H.Hamaguchi:“地震波形和斜率反演分析揭示的 1998 年日本岩手县地震的宽带震源过程
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Nakahara, H., T.Nishimura, H.Sato, M.Ohtake, S.Kinoshita, H.Hamaguchi: "Broad-band source process of the 1998 Iwate Prefecture, Japan, earthquakes as revealed from inversion analyses of seismic waveforms and envelope"Bull.Seis.Soc.Am.. 92. 1708-1720 (2002
Nakahara, H., T.Nishimura, H.Sato, M.Ohtake, S.Kinoshita, H.Hamaguchi:“通过地震波形和包络线反演分析揭示 1998 年日本岩手县地震的宽带震源过程
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Nakamura, A., A.Hasegawa, N.Hirata, T.Iwasaki, H.Hamaguchi: "Temporal variations of seismic wave velocity associated with 1998 M6.1 Shizukuishi earthquake."Pure.Appl.Geophys.. 159. 1183-1204 (2002)
Nakamura, A.、A.Hasekawa、N.Hirata、T.Iwasaki、H.Hamaguchi:“与 1998 年 M6.1 雫石地震相关的地震波速度的时间变化。”Pure.Appl.Geophys.. 159. 1183-1204
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内田直希, 西村太志, 吉本和生, 中原恒, 佐藤春夫, 大竹政和, 田中聡, 浜口博之: "1998年岩手県内陸北部地震前後の地震波速度変化"地震. 55. 193-206 (2002)
Naoki Uchida、Futoshi Nishimura、Kazuo Yoshimoto、Hisashi Nakahara、Haruo Sato、Masakazu Otake、Satoshi Tanaka、Hiroyuki Hamaguchi:“1998 年北部内陆地震前后地震波速度的变化”地震 55. 193-206 (2002)。
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Uchida, N., T.Nishimura, K.Yoshimoto, H.Nakahara, H.Sato, M.Ohtake, S.Tanaka, H.Hamaguchi: "Temporal change of seismic-wave velocity associated with the 1998 northern Iwate prefecture, Japan earthquake."Bull.Seism.Soc. Japan. 55. 193-206 (2002)
Uchida, N.、T.Nishimura、K.Yoshimoto、H.Nakahara、H.Sato、M.Ohtake、S.Tanaka、H.Hamaguchi:“与 1998 年日本岩手县北部相关的地震波速度的时间变化
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NISHIMURA Takeshi其他文献

Federated Authentication in a Hierarchy of IdPs by using Shibboleth
使用 Shibboleth 在 IdP 层次结构中进行联合身份验证
セキュリティマネジメント学~理論と事例~,第2章「工学的アプローチ」
安全管理理论与实例,第 2 章“工程方法”
  • DOI:
  • 发表时间:
    2011
  • 期刊:
  • 影响因子:
    0
  • 作者:
    SATO Hiroyuki;NISHIMURA Takeshi;吉浦裕
  • 通讯作者:
    吉浦裕

NISHIMURA Takeshi的其他文献

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{{ truncateString('NISHIMURA Takeshi', 18)}}的其他基金

A study on stress sensitivity of seismic velocity at shallow media using the earth tide and seismic wave interferometry
利用地球潮和地震波干涉技术研究浅层介质地震速度应力敏感性
  • 批准号:
    24654141
  • 财政年份:
    2012
  • 资助金额:
    $ 8.13万
  • 项目类别:
    Grant-in-Aid for Challenging Exploratory Research
Synthetic studies on the active substances for fruiting body induction using glycolipid model compounds having sugar-lipid hybrid structures
具有糖脂杂化结构的糖脂模型化合物的子实体诱导活性物质的合成研究
  • 批准号:
    24658160
  • 财政年份:
    2012
  • 资助金额:
    $ 8.13万
  • 项目类别:
    Grant-in-Aid for Challenging Exploratory Research
Study on the Diffusion Process of Biodiversity-Friendly Farming
生物多样性友好型农业扩散过程研究
  • 批准号:
    22780207
  • 财政年份:
    2010
  • 资助金额:
    $ 8.13万
  • 项目类别:
    Grant-in-Aid for Young Scientists (B)
Modeling of volcano inflation associated with magma ascent in an open conduit
与开放管道中岩浆上升相关的火山膨胀建模
  • 批准号:
    21540427
  • 财政年份:
    2009
  • 资助金额:
    $ 8.13万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Studies on modifications on the internal cranial morphology in the evolution of anthropoid orbits
类人猿眼眶演化过程中颅内形态改变的研究
  • 批准号:
    21770263
  • 财政年份:
    2009
  • 资助金额:
    $ 8.13万
  • 项目类别:
    Grant-in-Aid for Young Scientists (B)
The Role of the Modern Silver Market under the International Gold Standard in Asia
国际金本位制下现代白银市场在亚洲的作用
  • 批准号:
    21730283
  • 财政年份:
    2009
  • 资助金额:
    $ 8.13万
  • 项目类别:
    Grant-in-Aid for Young Scientists (B)
Silver Standard in China under the International Gold Standard,1873-1913
国际金本位制下的中国银本位制,1873-1913
  • 批准号:
    18730234
  • 财政年份:
    2006
  • 资助金额:
    $ 8.13万
  • 项目类别:
    Grant-in-Aid for Young Scientists (B)
STUDY ON SOURCE PROCESS OF VERY LONG PERIOD SEISMIC EVENTS
特长周期地震事件震源过程研究
  • 批准号:
    11640404
  • 财政年份:
    1999
  • 资助金额:
    $ 8.13万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)

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