Development of high-resolution crustal structure imaging method using seismic interferometry of dense seismic array data

• Project/Area Number: 24540451
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Solid earth and planetary physics
• Research Institution: The University of Tokyo
• Principal Investigator: KURASHIMO Eiji 東京大学, 地震研究所, 助教 (00302620)
• Project Period (FY): 2012-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000); Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2013: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2012: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
• Keywords: 地震波干渉法 / 地殻構造 / 稠密地震観測データ

Outline of Final Research Achievements

I developed a seismic array analysis method, using dense active and passive seismic data, to obtain high-resolution crustal image. By applying the improved seismic interferometry to dense seismic array data obtained in the southeastern part of NE Japan, high-resolution whole crustal image, including the geometry of Moho, was obtained. These results show that my new seismic array analysis method is a powerful technique to obtain high-resolution crustal image.

Research Products

• [Presentation] Aftershock distribution and heterogeneous structure in and around the source area of the 2014 northern Nagano Prefecture earthquake (Mw 6.2) , central Japan, revealed by dense seismic array observation (2015)
  • Author(s): Eiji Kurashimo，Naoshi Hirata，Takaya Iwasaki，Shinichi Sakai，Kazushige Obara，Tatsuya Ishiyama，Hiroshi Sato
  • Organizer: 2015 AGU Fall Meeting
  • Place of Presentation: San Francisco(USA)
  • Year and Date: 2015-12-14
  • Int'l Joint Research
• [Presentation] Seismic crustal structure beneath the southeastern part of northeast Japan by dense seismic array observation (2014)
  • Author(s): Eiji Kurashimo, Hiroshi Sato, Tatsuya Ishiyama, Motonori Higashinaka , Susumu Abe, Takaya Iwasaki
  • Organizer: 16TH SEISMIX International Symposium
  • Place of Presentation: Barcelona (Spain)
  • Year and Date: 2014-10-12 – 2014-10-17
• [Presentation] 稠密地震観測による東北地方南東部下の地殻構造 (2014)
  • Author(s): 蔵下英司・佐藤比呂志・石山達也・東中基倫・ 阿部進・岩崎貴哉
  • Organizer: 日本地球惑星科学連合2014年大会
  • Place of Presentation: パシフィコ横浜（神奈川県，横浜市）
  • Year and Date: 2014-04-30