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Published Papers 【 display / non-display 】

Published Papers 【 display / non-display 】

• 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)

• 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)

• Early Human Migration and Shell Use in Eastern Micronesia: Based on the Results of Recent Excavations on Pohnpei Island, Federated States of Micronesia

  Rintaro Ono, Kenyojiro Yamano, Osamu Kataoka, Jason Barnabas, Takuya Nagaoka, Chiaki Katagiri, Kaishi Yamagiwa

  Journal of Southeast Asian Archaeology   ( 41 ) 57 - 72   2022.02 [ 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 [ 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.

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• Non-destructive elemental analysis of prehistoric potsherds in the southern Ryukyu Islands, Japan: Consideration of the pottery surface processing technique in the boundary region between the Japanese Jōmon and Neolithic Taiwan

  Hiroaki Aoyama, Kaishi Yamagiwa, Shingo Fujimoto, Jin Izumi, Senri Ganeko, Shingo Kameshima

  Journal of Archaeological Science: Reports ( Elsevier BV )  33   102512 - 102512   2020.10 [ Peer Review Accepted ]

  Type of publication: Research paper (scientific journal)

  　View Summary

  The southern Ryukyu islands are at the southwest end of the Japanese Archipelago, and can be regarded as boundary region between Japan and Taiwan. Some artifacts with a presumed relationship with Neolithic Taiwan were found, dated to 4,800-3,300 BP. "Shimotabaru-type" pottery in particular could indicate cultural propagation from Taiwan due to similar pottery shapes. Other factors, like manufacturing techniques, have not been discussed much. Interestingly, some of this pottery had a characteristic heterogenous surface structure, which showed the possibility of some surface processing techniques like the slips or paint that is an indicative connection between the Southern Ryukyu Islands and Taiwan.Therefore, in this study, we analyzed this structure on Shimotabaru pottery using nondestructive methods such as X-ray fluorescence microscopy. Chemical analysis revealed that this structure was mainly composed of phosphorus and calcium, which differed from the Neolithic "red-coating" in Taiwan or other surface processing found in surrounding regions. Additionally, we also compared the chemical composition of the potsherd structure with the organic remains and soil associated with the potsherds, and concluded that it was not artificial surface processing but was caused by post-depositional alternation of many faunal remains. To our knowledge, this report is the first case in this region showing a distinct color change in the pottery surface because of coexisting faunal remains.Our results indicated that the heterogenous surface structure of Shimotabaru pottery was not kind of surface treatment but incidental and a result of the post-depositional environment. This result showed the surface processing such as slip or paint had not been developed in the Shimotabaru phase and supported an inconstant and weak cultural relationship the southern Ryukyu islands and surrounding regions, which in turn caused a re-estimation of the previous cultural relationship hypothesis.

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Presentations 【 display / non-display 】

• 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 

• ecent Archaeological Research of Ancient Human Evidence in the Southern Ryukyu Islands, Southwestern Part of Japan Archipelago

  Kaishi Yamagiwa

  Research Seminar No.217 of Research center for the Pacific Islands, Kagoshima University  2022.03  -  2022.03 

• When Did Early Migrants reach Pohnpei? Human Migration, Interisland Networks, and Resource Use in Eastern Micronesia

  Rintaro Ono, Jason Barnabas, Osamu Kataoka, Kaishi Yamagiwa, Takuya Nagaoka, Scott M. Fitzpatrick

  SAA 86th Annual Meeting (Online - 2021)  2021.04  -  2021.04 

• Prehistoric Ryukyu Islands and Island Environment

  山極 海嗣

  Symposium: 30th Anniversary of the University of Hawai’i, University of the Ryukyus Partnership  1900.01  -  1900.01 

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• Archaeological Study of Holocene Human Dispersal to Micronesia: Especially focus on Shell Artifacts.

  Grant-in-Aid for Scientific Research(C)

  Project Year: 2022.04  -  2025.03 

  Direct: 2,900,000 (YEN)  Overheads: 3,770,000 (YEN)  Total: 870,000 (YEN)

• Archaeological Study of Holocene Human Dispersal to Micronesia: Especially focus on Shell Artifacts.

  Grant-in-Aid for Scientific Research(C)

  Project Year: 2022.04  -  2025.03 

  Direct: 2,900,000 (YEN)  Overheads: 3,770,000 (YEN)  Total: 870,000 (YEN)

• Archaeological Study of Holocene Human Dispersal to Micronesia: Especially focus on Shell Artifacts.

  Grant-in-Aid for Scientific Research(C)

  Project Year: 2022.04  -  2025.03 

  Direct: 2,900,000 (YEN)  Overheads: 3,770,000 (YEN)  Total: 870,000 (YEN)

• Austronesian migration into Southeast Asia: interdisciplinary study of their pottery and burial tradition

  Challenging research (development)

  Project Year: 2020.07  -  2023.03 

  Direct: 19,500,000 (YEN)  Overheads: 25,350,000 (YEN)  Total: 5,850,000 (YEN)

• Austronesian migration into Southeast Asia: interdisciplinary study of their pottery and burial tradition

  Challenging research (development)

  Project Year: 2020.07  -  2023.03 

  Direct: 19,500,000 (YEN)  Overheads: 25,350,000 (YEN)  Total: 5,850,000 (YEN)

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