Seismic heterogeneous structures based on auto-correlation analysis of ambient noise on ocean-bottom seismometer recoreds

2012 Fiscal Year Final Research Report

• Project/Area Number: 22740288
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Solid earth and planetary physics
• Research Institution: Tohoku University
• Principal Investigator: ITO Yoshihiro 東北大学, 大学院・理学研究科, 助教 (30435581)
• Project Period (FY): 2010 – 2012
• Keywords: 地震波干渉法 / 自己相関関数 / 地震波反射面 / 沈み込み帯 / 二重地震面

Research Abstract

We obtained ambient seismic noise interferograms as seismic reflection images using autocorrelation functions (ACFs) in the northeastern Japan subduction zone. We constructed depth-migrated images using the ACFs. The depth-migrated images show a relatively seismically transparent structure within the subducting Pacific slab and a reflective structure within the mantle wedge. Furthermore, the migrated images show seismic scatterers within the subducting Pacific Slab. These images suggest that seismic scatterers, such as fluid from dehydration reactions of the hydrated metamorphosed mantle, exist in the lower as well as upper plane of the seismicity in the double seismic zone.

Research Products

• [Journal Article] Autocorrelation analysis of ambient noise in northeastern Japan subduction zone (2012)
  • Author(s): Ito, Y., K. Shiomi, J. Nakajima, R. Hino
  • Journal Title: Tectonophysics Pages: 38-46
  • DOI: doi:10.1016/j.tecto.2011.09.019.
  • Peer Reviewed
• [Journal Article] Seismic scatterers within subducting slab revealed from ambient noise autocorrelation (2012)
  • Author(s): Ito Y., and K. Shiomi
  • Journal Title: Geophys. Res. Lett Volume: 39
  • DOI: doi:10.1029/2012GL053321.
  • Peer Reviewed
• [Journal Article] Reconstruction of Deep-reflected Imaging from Autocorrelogram of Ambient Noise (2012)
  • Author(s): Ito, Y
  • Journal Title: Mitteilungen - Deutsche Geophysikalische Gesellschaft e.V. Sonderband Pages: 50-52
  • URL: http://www.geophysik.uni-muenchen. de/~hadzii/Noise_Diffuse_Wavefield s_abstracts_2012.pdf
• [Presentation] Reconstruction of Deep-reflected Imaging from Autocorrelogram of Ambient Noise (2012)
  • Author(s): Ito, Y
  • Organizer: The 2nd Neustadt Workshop - Noise and Diffuse Wavefields-
  • Place of Presentation: Neustadt an der Weinstrasse, Germany
  • Year and Date: 2012-11-11
• [Presentation] Detection of seismic velocity changes associated with the 2005 M7.2 Miyagi-Oki earthquake, NE, Japan, by auto correlation analysis of seafloor ambient Noise (2012)
  • Author(s): Ito, Y., C. Chujo, H. Nakahara, R. Hino
  • Organizer: European Seismological Commission 33-rd General Assembly
  • Place of Presentation: Moscow, Russia
  • Year and Date: 2012-08-19
• [Presentation] Seismic velocity changes associatedwith the 2005 M7.2 Miyagi-Oki Earthquake (2011)
  • Author(s): Chujo K., Y. Ito, H. Nakahra, R. Hino, T. Yamada, M. Shinohara, T. Kanazawa
  • Organizer: NE Japan revealed from seismic interferometry, AGU 2011 Fall Meeting
  • Place of Presentation: San Francisco, USA
  • Year and Date: 2011-12-05
• [Presentation] Singular value decomposition images calculated from autocorrelation functions of ambient noise detected by ocean-bottom seismometers in the Japan subduction zone (2011)
  • Author(s): Ito, Y., K. Chujo, R. Hino, T. Yamada, M. Shinohara, Y. Murai
  • Organizer: AGU 2011 Fall Meeting
  • Place of Presentation: San Francisco, USA
  • Year and Date: 2011-12-05
• [Presentation] 海底地震計記録を用いた地震波干渉法による2005年宮城県沖地震(Mj7.2)に伴う地震波速度変化の検出 (2011)
  • Author(s): 中条恒太・伊藤喜宏・中原恒・日野亮太・山田知朗・篠原雅尚・金沢敏彦
  • Organizer: 日本地震学会2011年秋季大会
  • Place of Presentation: 静岡市
  • Year and Date: 2011-10-12
• [Presentation] Autocorrelatin analysis of ambient noise in the northeastern Japan subduction zone (2011)
  • Author(s): Ito, Y., K. Shiomi, J. Nakajima, and R.Hino
  • Organizer: IUGG 2011
  • Place of Presentation: Melbourne, Australia
  • Year and Date: 2011-06-21
• [Presentation] 海底地震計記録を用いた地震波干渉法による2005年宮城県沖の地震(Mj7.2)に伴う地震波速度変化の検出 (2011)
  • Author(s): 中条恒太・伊藤喜宏・中原恒・日野亮太・山田知朗・篠原雅尚・金沢敏彦
  • Organizer: 日本地球惑星科学連合大会2011年大会
  • Place of Presentation: 千葉市
  • Year and Date: 2011-05-27
• [Presentation] ノイズ自己相関解析に基づく東北日本の深部地震波反射構造 (2011)
  • Author(s): 伊藤喜宏・汐見勝彦・中島淳一・日野亮太
  • Organizer: 日本地球惑星科学連合大会2011年大会
  • Place of Presentation: 千葉市
  • Year and Date: 2011-05-27
• [Presentation] Autocorrelation analysis of ambient noise in NE Japan (2010)
  • Author(s): Ito, Y., Chujo, K., Takagi, R., Hino, R., Suzuki, S., Yamada, T., Shinohara, M., Kanazawa, T., Murai, Y., Shiomi, K.,and Obara K
  • Organizer: 14^<th> International Symposium on Deep Seismic Profiling of the Continents and their Margins
  • Place of Presentation: Cairns, Australia
  • Year and Date: 2010-08-28
• [Presentation] 自己相関解析による東北日本沈み込み帯の地震波速度不連続面の検出 (2010)
  • Author(s): 伊藤喜宏・中条恒太・高木涼太・日野亮太・鈴木秀市・山田知朗・篠原雅尚・金沢敏彦・村井芳夫・汐見勝彦・小原一成
  • Organizer: 日本地球惑星科学連合2010年大会
  • Place of Presentation: 千葉市
  • Year and Date: 2010-05-23