Masaaki SHIRAI

J-GLOBAL         Last updated: Jun 7, 2019 at 21:41
Masaaki SHIRAI
Tokyo Metropolitan University

Research Areas

  • Earth and planetary science / Geology / sedimentology

Academic & Professional Experience

Apr 2016
University of Electro–Communications
Aug 2013
Tokyo Denki University

Awards & Honors

Aug 2017
Best Paper Award 2017, Japan Association for Quaternary Research

Published Papers

Shirai, M., Utsugawa, T., Omura, A., Hayashizaki, R., Kameo, K., Niwa, Y. and Shimizu H.
Environmental Earth Sciences   76 107 (9 pages)   Jan 2017   [Refereed]
The mass accumulation rate (MAR) in the hemipelagic environment (500–700 m water depth) off Niigata, central Japan since the early half of the 20th century was obtained from core samples, based on excess 210Pb activity. Decreases in MAR during the...
宇津川 喬子, 白井 正明
地理学評論. [Series A]   89(6) 329-346   Nov 2016   [Refereed]
The history of detrital grain shape analysis, particularly "roundness", since the first half of the 20th century and within various science–engineering fields was reviewed. Additionally, the authors suggested a flow chart supporting stable evaluat...
鈴木 毅彦, 白井 正明, 福嶋 徹
地質学雑誌   122(7) 343-356   Jul 2016
白井 正明, 林崎 涼, 劉 海江, 佐藤 愼司
第四紀研究   55(3) 107-118   Jun 2016   [Refereed]
Serious riverbed and beach erosions have taken place from downstream area of the Tenryu River to the Enshu Coast, central Japan, during the last several decades. Distribution of bleaching percentage (BLP), which was obtained on the basis of OSL (I...
Thiel, C., Tsukamoto, S., Tokuyasu, K., Buylaert, J-P. Murray, A. S., Tanaka, K. and Shirai, M.
Quaternary Geochronology   29 16-29   2015   [Refereed]
ABE Tomoya, SHIRAI Masaaki
The Quat. Res.   52(2) 33-42   Apr 2013   [Refereed]
The Pacific coast of Atsumi Peninsula has been repeatedly damaged by tsunamis. The characteristics of event deposits in the coastal lowland are discussed based on sedimentological and historical records. Sand layers, 1-4 cm thick, were found appro...
Masaaki SHIRAIShirai, M., Omura, A., Wakabayash, T., Uchida, J. and Ogami, T.
Marine Geology   271 225-235   2010   [Refereed]
Liu, H., Kishimoto, S., Takagawa, T., Shirai, M. and Sato, S.
Journal of Coastal Research   25 1096-1105   2009   [Refereed]
Shiraishi Tateo, Shirai Masaaki, Nishikawa Osamu, Suzuki Hayato, Furuhashi Kyoko, Hoshi Taeko
Jour. Geol. Soc. Japan   114(0) S33-S50   2008
男鹿半島には厚い海成更新統が分布しており,その中には多数の広域テフラが挟まれている.また酸素同位体ステージ12 以降については,酸素同位体比変動曲線で示される主要イベントが地層・地形記録として非常によく保存されている.それゆえ,第四紀層序学的に非常に重要な地域である.この男鹿半島を含む日本海沿岸地域は日本海東縁変動帯の一角を占め,八郎潟を挟む東西両地域一帯には,南北方向に長軸を有する活動的逆断層地溝(八郎潟-秋田湾地溝)が成立している.そのため新期の地殻変動が非常に激しく,地層や更新世海成...
KISHIMOTO Shun, LIU Haijiang, TAKAGAWA Tomohiro, SHIRAI Masaaki, SATO Shinji
Doboku Gakkai Ronbunshuu B   55 686-690   2008   [Refereed]
The feldspar thermoluminescence (TL) properties were utilized to investigate the sediment movement processes in the Tenryu-Enshunada fluvial system. An appropriate TL measuring sequence was proposed and the natural TL intensity of feldspar grains ...
Shirai Masaaki, Tsukamoto Sumiko, Kondo Reisuke
The Quaternary Research (Daiyonki-Kenkyu)   47(6) 377-389   2008   [Refereed]
Using intensity of optically stimulated luminescence (OSL) of a mineral grain in present sediments, the relationship between the percentage of bleached grains (bleaching percentage : BLP) in each sample and the transport process of fluvial sand gr...
FUJIWARA Hirokazu, SATO Shinji, SHIRAI Masaaki, TAJIMA Yoshimitsu
Doboku Gakkai Ronbunshuu B   54 591-595   2007   [Refereed]
A field investigation was conducted for sand movement in the Tenryu-Enshunada watershed. Sediment samples on the coast and the riverbed were collected in a wide area including in the trench excavated at the old riverbed, for which mineral analysis...
HATAYA Ryuta, SHIRAI Masaaki
The Quat. Res.   42(5) 347-359   Oct 2003   [Refereed]
We examined the OSL dating of shallow marine sediments, for the purpose of dating marine terrace deposits. First, we carried out optical bleaching/heating/HF-etching experiments using quartz grains and determined a sample preparation procedure in ...
Sedimentary successions formed by fifth-order glacio-eustatic cycles in the middle to upper Quaternary formations of the Oga Peninsula, northeast Japan
Shirai, M. and Tada, R.
Journal of Sedimentary Research   70 839-849   2000   [Refereed]
SHIRAI Masaaki, TADA Ryuji, FUJIOKA Kantaro
The Quat. Res.   36(3) 183-196   Jul 1997   [Refereed]
Widespread tephras correlated with Aso-4, Toya, Aso-3, and B-Og have been previously reported from the Shibikawa and Katanishi Formations at the Anden Coast, Oga Peninsula. Among these tephras, identification of Aso-3 is questionable considering t...


Influence of dam reservoir on deep marine sedimentological environment: An example of the Kumano Trough, central Japan
Masaaki SHIRAI and Akiko Omura
Geographical Report of Tokyo Metropolitan University   51 119-126   Mar 2016
Sand grain producing–transport processes estimated from gravel–sand grain roundness on dams-constructed Tenryu River, central Japan. T. Utsugawa and M. Shirai Geographical Reports of Tokyo Metropolitan University 51 101-108 2016年3月
T. Utsugawa and M. Shirai
Geographical Reports of Tokyo Metropolitan University   51 101-108   Mar 2016
A study of the formation process of the Noshiro coastal dune, Akita Prefecture, northeastern Japan
Utsugawa, T. and Shirai, M.
Geographical Reports of Tokyo Metropolitan University   48 1-11   Mar 2013
Report on the tsunami deosits caused by the 2011 off the Pacific Coast of Tohoku Earthquake in the Soma Region, Fukushima Prefecture, northeast Japan
R. Hayashizaki and M. Shirai
Geographical Reports of Tokyo Metropolitan University   47 1-10   Mar 2012
Historical review of the origin of the Ries Structure
Masaaki SHIRAI
Chishitsu News   473 35-42   Jan 1994

Books etc

The Book of materials –Nature–, in History of Hamura-city
Masaaki SHIRAI (Part:Contributor, Chapters 1, 2, 3 to 6 and 8)
Hamura-city   Mar 2019   

Conference Activities & Talks

Mountain, river and slopes: geologic and geomorphologic processes around the Hamura City
Masaaki SHIRAI
The 2nd special lecture associated with compilation of the History of the Hamura City   26 Nov 2016   
Shirai Masaaki
Annual Meeting of the Geological Society of Japan   2011   
Izumitani Naoki, Murayama Masafumi, Sagawa Takuya, Asahi Hirofumi, Nakamura Yasuyuki, Shirai Masaaki, Ashi Juichiro, Tokuyama Hidekazu, Kitazato Hiroshi
Annual Meeting of the Geological Society of Japan   2009   
Shirai Masaaki, Liu Haijiang, Takagawa Tomohiro, Kishimoto Shun, Sato Shinji
日本地質学会学術大会講演要旨   15 Sep 2008   
Shirai Masaaki, Liu Haijiang, Takagawa Tomohiro, Kishimoto Shun, Sato Shinji
Annual Meeting of the Geological Society of Japan   2008