Seismological study of enigmas around depth 200km of the Earth

2008 Fiscal Year Final Research Report

• Project/Area Number: 18540421
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Solid earth and planetary physics
• Research Institution: Kyoto University
• Principal Investigator: KUGE Keiko Kyoto University, 大学院・理学研究科, 准教授 (50234414)
• Project Period (FY): 2006 – 2008
• Keywords: 地震波 / プレート / マントル / 地震

Research Abstract

地震波でみる上部マントル構造は、表層200kmに特徴をもつ。大陸域では、表層200kmに高地震波速度・低速度勾配・低減衰の領域をもつ構造が、観測される地震波を説明する。化学組成の違いと関係する可能性がある。沈み込み帯では、地震波速度不連続の不均質構造や低減衰がみられる。一部は、沈み込むプレートの表れと考えられる。200km以浅の沈み込むプレートの構造は、地震の起こり方の特徴から、水の分布に関係している可能性がある。

Research Products

• [Journal Article] Heterogeneous rupture on homogeneous faults : Three-dimensional spontaneous rupture simulations with thermal pressurization (2008)
  • Author(s): Urata, Y., K. Kuge, Y. Kase
  • Journal Title: Geophysical Research Letters 35
  • Peer Reviewed
• [Presentation] The 2005 Tarapaca, Chile, intermediate-depth earthquake : Evidence of heterogeneous fluid distribution across the plate? (2008)
  • Author(s): Kuge, K., Y. Kase, Y. Urata, J. Campos, A. Perez
  • Organizer: American Geophysical Union 2008 Fall meeting
  • Place of Presentation: San Francisco, USA
  • Year and Date: 2008-12-16
• [Presentation] The 2005 Tarapaca, Chile, intermediate-depth earthquake : Evidence of heterogeneous fluid distribution across the plate? (2008)
  • Author(s): Kuge, K., Y. Kase, Y. Urata, J. Campos, A. Perez
  • Organizer: 7th General Assembly of Asian Seismological Commission and Seismological Society of Japan, 2008, Fall meeting
  • Place of Presentation: Tsukuba, Japan
  • Year and Date: 2008-11-26
• [Presentation] Crust and mantle structure beneath Sea of Okhotsk deduced from multiple ScS reverberation waveforms (2008)
  • Author(s): Kuge, K., M. Kato
  • Organizer: 7th General Assembly of Asian Seismological Commission and Seismological Society of Japan, 2008, Fall meeting
  • Place of Presentation: Tsukuba, Japan
  • Year and Date: 2008-11-25
• [Presentation] Crustal and upper mantle structure beneath Central South America deduced from ScS reverberation waveforms and receiver functions (2007)
  • Author(s): Okaue, Y., K. Kuge, M. Kato
  • Organizer: American Geophysical Union 2007 Fall meeting
  • Place of Presentation: San Francisco, USA
  • Year and Date: 2007-12-12
• [Presentation] Crustal and upper mantle structure beneath Central South America deduced from ScS reverberation waveforms and receiver functions (2007)
  • Author(s): Okaue, Y., K. Kuge, M. Kato
  • Organizer: The International Union of Geodesy and Geophysics XXIV General Assembly
  • Place of Presentation: Perugia, Italy
  • Year and Date: 2007-07-06
• [Presentation] Crustal and upper mantle structure beneath 20S of South America (2007)
  • Author(s): 岡上雄介, 久家慶子, 加藤護
  • Organizer: 日本地球惑星科学連合2007年大会
  • Place of Presentation: 千葉幕張
  • Year and Date: 2007-05-23