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A basic study on remanent magnetization of volcanic ash layer

Research Project

Project/Area Number 17K05683
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Geology
Research InstitutionKumamoto University

Principal Investigator

Mochizuki Nobutatsu  熊本大学, 大学院先端科学研究部(理), 准教授 (60422549)

Co-Investigator(Kenkyū-buntansha) 長谷川 健  茨城大学, 理工学研究科(理学野), 准教授 (00574196)
渋谷 秀敏  同志社大学, 研究開発推進機構, 嘱託研究員 (30170921)
Project Period (FY) 2017-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2017: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywords火山灰 / 堆積残留磁化 / 古地磁気方位 / 開聞岳 / 残留磁化 / 古地磁気 / 岩石磁気 / テフラ / 火山層序
Outline of Final Research Achievements

Remanent magnetization of volcanic ash layers is clearly understood, but the remanent magnetization has the potential to record the paleomagnetic field and to be a new recorder to recover paleomagnetic secular variations. We conducted a fundamental study on remanent magnetizations of volcanic ash layers. Paleomagnetic analyses show that inclinations of the remanent magnetizations are consistent or shallower than that of the paleomagnetic field when the volcanic ash layer formed. On the other hand, declinations of the remanent magnetizations are consistent with the paleomagnetic field. The reasons for the differences between the remanent magnetization and the paleomagnetic field are unclear; the shallow inclination may be related to local magnetic anomaly, sedimentation/compaction processes, etc.

Academic Significance and Societal Importance of the Research Achievements

本研究により火山近傍の火山灰が安定な残留磁化を持っていることが確認された。いくつかの火山灰層の残留磁化は地磁気伏角よりもいくらか浅いものがあり,この要因については検討が必要ではあるものの,細粒火山灰層は堆積当時の地磁気方位に平行な残留磁化を獲得しているようだ。古地磁気方位の復元には,火山岩や火砕流堆積物だけではなく,火山灰層も利用できる可能性が見えてきたといえる。

Report

(6 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (17 results)

All 2021 2020 2019 2018

All Journal Article (7 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 7 results,  Open Access: 4 results) Presentation (10 results) (of which Int'l Joint Research: 4 results,  Invited: 1 results)

  • [Journal Article] Eruption Styles and Processes of the 7.6ka Caldera-forming Eruption of Mashu Volcano, Eastern Hokkaido, Japan: Reconstruction of a High-resolution Eruption Sequence Based on Geologic, Petrologic and Paleomagnetic Methods and Recognition of Low Aspect Ratio Ignimbrite (LARI)2021

    • Author(s)
      長谷川 健、柴田 翔平、小林 哲夫、望月 伸竜、中川 光弘、岸本 博志
    • Journal Title

      BULLETIN OF THE VOLCANOLOGICAL SOCIETY OF JAPAN

      Volume: 66 Issue: 3 Pages: 187-210

    • DOI

      10.18940/kazan.66.3_187

    • NAID

      130008112023

    • ISSN
      0453-4360, 2189-7182
    • Year and Date
      2021-09-30
    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] A tephra-based approach to calibrating relative geomagnetic paleointensity stacks to absolute values2021

    • Author(s)
      Mochizuki Nobutatsu、Fujii Satomu、Hasegawa Takeshi、Yamamoto Yuhji、Hatakeyama Tadahiro、Yamashita Daisuke、Okada Makoto、Shibuya Hidetoshi
    • Journal Title

      Earth and Planetary Science Letters

      Volume: 572 Pages: 117119-117119

    • DOI

      10.1016/j.epsl.2021.117119

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Experimental Evaluation of Remanence Carriers Using the Microcoercivity‐Unblocking Temperature Diagram2019

    • Author(s)
      Sato Masahiko、Terada Takuma、Mochizuki Nobutatsu、Tsunakawa Hideo
    • Journal Title

      Geochemistry, Geophysics, Geosystems

      Volume: 20 Issue: 11 Pages: 5177-5191

    • DOI

      10.1029/2019gc008534

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Synchronizing volcanic, sedimentary, and ice core records of Earth’s last magnetic polarity reversal2019

    • Author(s)
      Singer Brad S.、Jicha Brian R.、Mochizuki Nobutatsu、Coe Robert S.
    • Journal Title

      Science Advances

      Volume: 5 Issue: 8

    • DOI

      10.1126/sciadv.aaw4621

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Low absolute paleointensity during Late Miocene Noma excursion of the Earth’s magnetic field2019

    • Author(s)
      Okayama Kazuhiro、Mochizuki Nobutatsu、Wada Yutaka、Otofuji Yo-ichiro
    • Journal Title

      Physics of the Earth and Planetary Interiors

      Volume: 287 Pages: 10-20

    • DOI

      10.1016/j.pepi.2018.12.006

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Methods of Estimating the Durations of Super Large Eruptions Based on Pyroclastic Deposits2018

    • Author(s)
      長谷川健,望月伸竜,大岩根尚
    • Journal Title

      Journal of Geography (Chigaku Zasshi)

      Volume: 127 Issue: 2 Pages: 273-288

    • DOI

      10.5026/jgeography.127.273

    • NAID

      130007395831

    • ISSN
      0022-135X, 1884-0884
    • Year and Date
      2018-04-25
    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Reductive chemical demagnetization: a new approach to magnetic cleaning and a case study of reef limestones2018

    • Author(s)
      Anai Chisato、Mochizuki Nobutatsu、Shibuya Hidetoshi
    • Journal Title

      Earth, Planets and Space

      Volume: 70 Issue: 1 Pages: 184-184

    • DOI

      10.1186/s40623-018-0954-x

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 古地磁気永年変化層序:火山噴出物層序研究への貢献2021

    • Author(s)
      望月伸竜, 穴井千里, 馬場章, 渋谷秀敏
    • Organizer
      日本地質学会第128回学術大会
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] 北海道東部,摩周火山の7.6 ka噴火:爆発的カルデラ形成過程とLow aspect ratio ignimbriteの発生2021

    • Author(s)
      長谷川 健, 柴田 翔平, 小林 哲夫, 望月 伸竜, 中川 光弘, 岸本 博志
    • Organizer
      日本地質学会第128回学術大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] TA-TOR: a new approach to calibrating relative geomagnetic paleointensity stacks to absolute values2021

    • Author(s)
      Nobutatsu Mochizuki, Satomu Fujii, Takeshi Hasegawa, Yuhji Yamamoto, Tadahiro Hatakeyama, Daisuke Yamashita, Makoto Okada, Hidetoshi Shibuya
    • Organizer
      AGU Fall Meeting 2021
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 古地磁気方位と永年変化を利用した大規模カルデラ噴火の継続時間の推定:姶良カルデラとMamaku/Ohakuri ignimbritesの例2020

    • Author(s)
      長谷川 健, 望月 伸竜, Gravley Darren, 楠 稚枝, 岡田 誠, 下司 信夫, Kosik Szabolcs, 柴田 翔平, 金田 泰明
    • Organizer
      JpGU-AGU Joint Meeting 2020
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Paleomagnetic study of Holocene lava flow age at Nakadake volcano in Aso caldera, Kyushu Japan: Contribution to establish the Eruption history2020

    • Author(s)
      穴井 千里, 望月 伸竜, 宮縁 育夫, 宇津木 充, 渋谷 秀敏, 大倉 敬宏
    • Organizer
      JpGU-AGU Joint Meeting 2020
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Paleomagnetic study of volcanic rocks across the spreading axis in the Tendaho Graben in the Afar depression2020

    • Author(s)
      Haotian Liu, Nobutatsu Mochizuki, Tesfaye Kidane, Ameha Atnafu, Masakazu Fujii, Ryokei Yoshimura, Shin-ichi Kagashima, Yo-ichiro Otofuji, Naoto Ishikawa
    • Organizer
      球電磁気・地球惑星圏学会第148回講演会
    • Related Report
      2020 Research-status Report
  • [Presentation] Paleomagnetic study of Holocene lava flow age at Nakadake volcano in Aso caldera, Kyushu Japan: Contribution to establish the Eruptive history2019

    • Author(s)
      Chisato Anai, Yasuo Miyabuchi, Mitsuru Utsugi, Nobutatsu Mochizuki, Hidetoshi Shibuya, Takahiro Ohkura
    • Organizer
      AGU Fall Meeting 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] 支笏カルデラ噴火堆積物の古地磁気学的測定:古地磁気永年変化にもとづく堆積物の時間スケールの推定2019

    • Author(s)
      望月伸竜, 穴井千里, 治田有里紗, 渋谷秀敏
    • Organizer
      地球電磁気・地球惑星圏学会第146回講演会
    • Related Report
      2019 Research-status Report
  • [Presentation] 鬼界カルデラ形成噴火における時間間隙:古地磁気方位と地磁気永年変化からの推定2018

    • Author(s)
      長谷川 健、望月 伸竜、大岩根 尚
    • Organizer
      JpGU Meeting 2018
    • Related Report
      2018 Research-status Report
  • [Presentation] 支笏カルデラ噴火堆積物の古地磁気学的測定:大規模噴火堆積物の時間間隙の推定へ向けて2018

    • Author(s)
      望月 伸竜、長谷川 健、中川 光弘
    • Organizer
      JpGU Meeting 2018
    • Related Report
      2018 Research-status Report

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Published: 2017-04-28   Modified: 2023-01-30  

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