Yamagiwa Kaishi

写真a

Title

Associate Professor

Researcher Number(JSPS Kakenhi)

80781202

Date of Birth

1985

Laboratory Address

Research Institute for the Islands and Sustainability, University of the Ryukyus. 1 Senbaru, Nishihara, Okinawa, Japan, 903-0213

Laboratory Phone number

+81-98-895-8475

Homepage URL

https://riis.skr.u-ryukyu.ac.jp/

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Current Affiliation Organization 【 display / non-display 】

  • Duty   University of the Ryukyus   Research Institute for Islands and Sustainability: RIIS   Associate Professor  

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University 【 display / non-display 】

  • 2006.04
    -
    2010.03

    Ryukoku University   Faculty of Literature   Graduated

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Graduate School 【 display / non-display 】

  • 2010.04
    -
    2012.03

    University of the Ryukyus  Graduate School, Division of Humanities and Social Sciences  Master's Course  Completed

  • 2015.04
    -
    2016.03

    National Museum of Ethnology    Other  Completed

  • 2012.04
    -
    2016.03

    University of the Ryukyus  Graduate School, Division of Humanities and Social Sciences  Doctor's Course  Completed

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External Career 【 display / non-display 】

  • 2016.04
    -
    2020.03

    Assistant Professor, Center for Strategic Research Project, University of the Ryukus  

  • 2020.04
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    2020.11

    Japan Society for the Promotion of Science  

  • 2020.12
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    2025.03

    Lecture, Research Institute for Islands and Sustainability, University of the Ryukyus  

  • 2022.04
    　
    　

    National Museum of Ethnology  

  • 2025.04
    　
    　

    Associate Professor, Research Institute for Islands and Sustainability, University of the Ryukyus  

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Affiliated academic organizations 【 display / non-display 】

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    The Society for the Study of Material Culture 

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    JAPAN SOCIETY FOR SOUTHEAST ASIAN ARCHAEOLOGY 

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    JAPANESE SOCIETY FOR OCEANIC STUDIES 

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    OKINAWA ARCHAEOLOGICAL SOCIETY 

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Research Interests 【 display / non-display 】

  • Archaeology, Prehistoric human chronology

  • Ryukyus islands, Okinawa

  • Southern Ryukyus, Miyako-Yaeyama islands

  • Chemical analysis of Material cultures

  • Cultural adaptation for island environment

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Research Areas 【 display / non-display 】

  • Archaeology

  • Humanities & Social Sciences / Cultural assets study

  • Miyako-Yaeyama islands

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Acquisition of a qualification 【 display / non-display 】

  • Dive Person

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Published Papers 【 display / non-display 】

  • AMS radiocarbon ages of Holocene tephras from Iraya Volcano in the northern Philippines

    Mitsuru Okuno, Robjunelieaaa B. Lim, Eiichi Sato, Eusebio Dizon, Ame Garong, Danikko John V. Rivera, Ericson B. Bariso, Marie Thess D. Quilalang-Gemal, Abigael Castro, Takashi Tashiro, Reina Nakaoka, Kaishi Yamagiwa, Kazuhiko Tanaka

    Radiocarbon ( Cambridge University Press )    1 - 11   2026.01 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

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      DOI

  • The Potential of Ryukyu Archipelago Human History Studies Beyond the Perspective of Origins: New Possibilities for Comparative Regional Cultural Research on the Unique Cultural Formation in the Prehistoric Southern Ryukyus

    Proceedings of the 30th Anniversary of the Archaeology Laboratory, University of the Ryukyus     1 - 12   2024.07

    Type of publication: Research paper (bulletin of university, research institution)

  • Ceramic Roof Tiles in Ryukyu Islands and Taiwan in Modern Period

    So Hatano, Kaishi Yamagiwa, Saki Takeshima

    Journal of Southeast Asian Archaeology   ( 42 ) 73 - 84   2023.02 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

  • A new perspective on the evolution of "Kawara" roof tiles in Ryukyu: A multidisciplinary non-destructive analysis of roof tile transition at Shuri Castle, Ryukyu Islands, Japan

    Aoyama, H; Yamagiwa, K; Taira, W; Kon, T

    PLOS ONE ( Plos One )  17 ( 11 ) e0277560 - e0277560   2022.11 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

    　View Summary

    A unique historical architecture was created at Shuri Castle (Shuri-jo) in the Ryukyu Islands by its “Kawara” roof tiles. After the 13th and 14th centuries, Kawara tiles were introduced to the Ryukyu Islands from several regions, including China, Korea, and mainland Japan, and evolved shapes and patterns that are unique to this island region. However, the transition of some internal features, such as the chemical components and microstructure, had not been analyzed. This study used a multi-faceted approach for such internal data and non-destructive quantitative methods to propose a new perspective on the evolution of historical Ryukyuan Kawara. We analyzed two styles of Ryukyuan Kawara from the 13th to 15th centuries and found that the material processing and firing conditions of the two styles were very similar, even though it had been suggested that they had different origins. A quantitative analysis of tiles from the 16th to 19th centuries revealed a transition in color tone to red, leading to the modern traditional Ryukyuan tiles; traces of changes in firing conditions were also found along with this transition. Finally, the study revealed that the evolution of Ryukyuan Kawara consisted of changed factors, e.g. surface color, and unchanged factors, e.g. paste density. Previous archaeological studies mainly focused on changing external characteristics, such as form and pattern; however, our analysis showed that the internal features changed, while the elemental composition and paste density remained constant from the appearance of the roof tiles until the 19th century. We propose that this is related to different responses of individual factors to external stressors, such as the social context, which may be common to other archaeological artifacts as well. Our study provides a new perspective on the evolution of Ryukyuan Kawara and presents a different discussion of and methods for the chronological study of material culture.

  • Early Human Cultural and Communal Diversity in the Ryukyu Islands

    Kaishi Yamagiwa

    Okinawan Journal of Island Studies   3 ( 2 ) 3 - 15   2022.03 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

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Presentations 【 display / non-display 】

  • An update on the “Eruptive history of Iraya Volcano and the exchange history between Taiwan and Luzon viewed from the archaeological sites of Batan Island in the Philippines”

    Ame Garong, Kaishi Yamagiwa, Eusebio Dizon, Kazuhiko Tanaka, Mitsuru Okuno

    Closing Seminar: A collaborative project between the National Museum of the Philippines, Osaka Metropolitan University, Tsurumi University and University of the Ryukus  2025.02  -  2025.02 

  • The Austronesian expanding colonization in Batanes and Lallo, Cagayan Valley, Philippines

    Kazuhiko Tanaka, Ame Garong, Kaishi Yamagiwa, Eusebio Z. Dizon, Okuno Mitsuru

    European Roundtable on Southeast Asian Archaeology: Current Research and Perspectives  2024.07  -  2024.07 

  • 環シナ海島嶼地域のモザイク状境界領域研究へ向けて

    山極海嗣

    『先史南琉球地域の文化・集団起源に関する網羅的地域比較研究』に向けた研究会  2023.11  -  2023.11 

  • Excavation Report of Shiraho-D Cave (Karadagi Cave) in Ishigaki Island, Okinawa.

    Kaishi Yamagiwa, Shingo Kameshima, Seita Gushiken, Chiaki Katagiri, Rintaro Ono, Yoshirou Ishihara

    Regular Conference of Okinawa Archaeological Society in November, 2022.  2022.11  -  2022.11 

  • Large-Scale Tsunami Events Records of Deposits and Stalagmites in Caves of Ishigaki Island, Okinawa Prefecture, Japan

    JpGU Meeting 2022  2022.05  -  2022.06 

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Grant-in-Aid for Scientific Research 【 display / non-display 】

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Social Activity 【 display / non-display 】

  • 2020.02
    　
    　

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