Structural Features of Megathrust beneath the North Island, New Zealand

• Project/Area Number: 21253006
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 海外学術
• Research Field: Solid earth and planetary physics
• Research Institution: The University of Tokyo
• Principal Investigator: IWASAKI Takaya 東京大学, 地震研究所, 教授 (70151719)
• Co-Investigator(Kenkyū-buntansha): SATO Hiroshi 東京大学, 地震研究所, 教授 (00183385) ; KURASHIMO Eiji 東京大学, 地震研究所, 助教 (00302620) ; IIDAKA Takashi 東京大学, 地震研究所, 准教授 (00221747) ; ISHIYAMA Tatsuya 東京大学, 地震研究所, 助教 (90356452) ; KATO Aitaro 東京大学, 地震研究所, 助教 (20359201) ; HIRATA Naoshi 東京大学, 地震研究所, 教授 (90156670) ; MIYAUCHI Takahiro 千葉大学, 理学研究科, 教授 (00212241)
• Project Period (FY): 2009 – 2011
• Project Status: Completed (Fiscal Year 2011)
• Budget Amount: ¥46,280,000 (Direct Cost: ¥35,600,000、Indirect Cost: ¥10,680,000); Fiscal Year 2011: ¥17,550,000 (Direct Cost: ¥13,500,000、Indirect Cost: ¥4,050,000); Fiscal Year 2010: ¥21,450,000 (Direct Cost: ¥16,500,000、Indirect Cost: ¥4,950,000); Fiscal Year 2009: ¥7,280,000 (Direct Cost: ¥5,600,000、Indirect Cost: ¥1,680,000)
• Keywords: 地震 / 地球・惑星内部構造 / 地質学 / ニュージーランド / ヒクランギ海台 / 構造探査 / 沈む込み帯 / 巨大地震 / 大都市 / 分岐断層 / プレート境界 / プレート / ヒクランギ / アスペリティ / 制御震源地震探査 / 固着域 / 沈み込み帯 / 地殻構造 / 上部マントル / 流体

Research Abstract

Active source seismic experiment conducted in the North Island, New Zealand revealed detailed subduction structure of the Hikurangi Plateau and the structural deformation of the overlying Australian plate. The subducted slab show a clear change in its dip beneath the North Island, around which oceanic materials are stacked to form a remarkable low velocity body. A series of branch faults such as the Wairapapa fault are developed eastward from this anomalous structure.

Research Products

• [Journal Article] Holocene paleoseismic history of upper plate faults in the southern Hikurangi subduction margin, New Zealand, deduced from marine terrace records (2011)
  • Author(s): Kelvin Berryman, Yoko Ota, Takahiro Miyauchi, 他5名
  • Journal Title: Bulletin of Seismological Society of America Volume: 101 Pages: 2064-2087
  • Peer Reviewed
• [Journal Article] Seismic characteristics around the fault segment boundary of historical great earthquakes along the Nankai Trough revealed by repeated long-term OBS observations (2010)
  • Author(s): Mochizuki, K., K. Nakahigashi, A. Kuwano, T. Yamada, M. Shinohara, S. Sakai, T. Kanazawa, K. Uehira and H. Shimizu
  • Journal Title: Geophys. Res. Lett Volume: 37 Issue: 9
  • DOI: 10.1029/2010gl042935
  • Peer Reviewed
• [Journal Article] SAHKE geophysical transect reveals crustal and subduction zone structureat the southern Hikurangi margin
  • Author(s): Henrys, S., Wech, A., Sutherland. R., Stern, T., Savage, M., Sato, T., Mochizuki, K., Iwasaki, T., D. Okaya, D., Seward, A., Tozer, B., Townend, J., Kurashimo, E., Iidaka, T. and Ishiyama, T.
  • Journal Title: New Zealand, Geochemistry Geophysics Geosystems Volume: (in press)
• [Presentation] The 2009-11SAHKE Experiment: 2D velocity imaging across the interseismically locked southern Hikurangi margin, Wellington (2012)
  • Author(s): Henrys, S., Wech, A., Sato, H., Okada, D., Iwasaki, T. Stern, T., Savage, M., Kurashimo, E., Sutherland, R.
  • Organizer: New Zealand, AGU Fall Meeting
  • Place of Presentation: San Francisco(USA).
  • Year and Date: 2012-12-05
• [Presentation] Seismic scatterer distribution beneath the Wellington region, southernmost part of New Zealand's North Island (2012)
  • Author(s): Kurashimo, E., Sato, H., Iidaka, T., Ishiyama, T., Iwasaki, T., Henrys, S.A., Sutherland, R., Stern, T.A., Savage, M. & Okada, D.A.
  • Organizer: AGU Fall Meeting
  • Place of Presentation: San Francisco(USA).
  • Year and Date: 2012-12-05
• [Presentation] 2012. Wide-angle OBS velocity structure and gravity modeling along the SAHKE transect, lower North Island, New Zealand (2012)
  • Author(s): Mochizuki, K., Henrys, S., Yamada, T., Sutherland, R., Shinohara, M. & Iwasaki, T.
  • Organizer: AGU Fall Meeting
  • Place of Presentation: San Francisco (USA)
  • Year and Date: 2012-12-05
• [Presentation] スチュアート・ヘンリーズ, マー サ・サヴェージ, ティム・スターン, ルパート・サザーランド, デービッド・オカヤ,低重合反射法地震探査によるニュージー ランド北島・ワイララパ断層の深部地下構 造 (2012)
  • Author(s): 石山達也, 蔵下英司, 加藤直子, 佐藤比呂 志, 飯高隆, 岩崎貴哉, 北村重浩, 中山貴隆
  • Organizer: 日本地球惑星科学連合大会
  • Place of Presentation: 千葉(幕張メッセ)
  • Year and Date: 2012-05-21
• [Presentation] 低重合反射法地震探査によるニュージーランド北島・ワイララパ断層の深部地下構造 (2012)
  • Author(s): 石山達也
  • Organizer: 日本地球惑星科学連合2012大会
  • Place of Presentation: 千葉市幕張メッセ
• [Presentation] ニュージーランド北島，ウエリントン地域下における地震波散乱体分布 (2012)
  • Author(s): 蔵下英司
  • Organizer: 日本地球惑星科学連合2012大会
  • Place of Presentation: 千葉市幕張メッセ
• [Presentation] Seismic scattering distribution beneath the Wellington region, New Zealand (2012)
  • Author(s): Kurashimo, E.
  • Organizer: 15th Int. Symp. “Deep Seismic Profiling of the Continents and Their Margins”
  • Place of Presentation: Beijin, China
• [Presentation] ヒクランギ沈み込み帯(ニュージーランド)のテクトニクス解明のための地震観測と構造調査 (2011)
  • Author(s): 望月公廣・山田知朗・篠原雅尚・佐藤比呂志・岩崎貴哉・Stuart Henrys・Rupert Sutherland
  • Organizer: 日本地球惑星科学連合大会
  • Place of Presentation: 千葉(幕張メッセ)
  • Year and Date: 2011-05-27
• [Presentation] Wide-angle OBS velocity structure along the SAHKE transect, lower North Island (2011)
  • Author(s): Mochizuki, K., Yamada, T., Shinohara, M., Iwasaki, T., Sato, H., Henrys, S., Sutherland,R.
  • Organizer: New Zealand, AGU Fall meeting
  • Place of Presentation: San Francisco (USA).
  • Year and Date: 2011-02-05
• [Presentation] Offshore seismic survey and observation using OBSs across the locked southern Hikurangi margin (2010)
  • Author(s): Mochizuki, K., Henrys, S., Sato, H., Iwasaki, T.,他 4 名
  • Organizer: New Zealand, AGU Fall Meeting
  • Place of Presentation: San Francisco (USA)
  • Year and Date: 2010-12-17
• [Presentation] SAHKE experiment reveals seismic-reflection character of the source region of deep slow slip events, Hikurangi subduction zone (2010)
  • Author(s): Sutherland, R., S. Henrys, K. Mochizuki, Sato, H., Iwasaki, T., Stern, T., Savage, M., Towned, J., Barker, D., Seward, A., Henderson, M., Bassett, D., Bell, R.
  • Organizer: New Zealand, AGU Fall Meeting
  • Place of Presentation: San Francisco (USA).
  • Year and Date: 2010-12-17
• [Presentation] Offshore seismic survey and observation using OBSs across the locked southern Hikurangi margin, New Zealand (2010)
  • Author(s): K.Mochizuki, 他6名
  • Organizer: AGU Fall Meeting
  • Place of Presentation: San Franciscoアメリカ
  • Year and Date: 2010-12-17
• [Presentation] ニュー ジーランド北島下メガスラストを探る-日 本-ニュージーランド共同構造探査- (2010)
  • Author(s): 岩崎貴哉・佐藤比呂志・他 12 名
  • Organizer: 日本地球惑星科学連合大会
  • Place of Presentation: 千葉(幕張メッセ)
  • Year and Date: 2010-05-25
• [Presentation] ニュージーランド北島下メガスラストを探る-日本-ニュージーランド共同構造探査- (2010)
  • Author(s): 岩崎貴哉・佐藤比呂志, 他12名
  • Organizer: 日本地球惑星科学連合大会
  • Place of Presentation: 幕張メッセ(千葉市)
  • Year and Date: 2010-05-25