Structural Features of Megathrust beneath the North Island, New Zealand

2011 Fiscal Year Final Research Report

• 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
• Keywords: 地震 / 地球・惑星内部構造 / 地質学

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 (2010)
  • Author(s): Berryman, K., Ota, Y., Miyauchi, T.
  • Journal Title: Bull. Seismol. Soc, Am Volume: 37
  • DOI: doi:10.1029/2010GL042935
• [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] 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] 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