Hiroo Nasu

Okayama University of Science

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Yuki Sawai

Geological Survey of Japan

Masanobu Shishikura

Geological Survey of Japan

Takanobu Kamataki

Okayama University of Science

Kenji Satake

The University of Tokyo

Takeshi Inomata

University of Arizona

Kazuo Aoyama

NTT (Japan)

Yoshinori Yasuda

Nagoya University

Mitsuru Okuno

Fukuoka University

Flory Pinzón

Ministerio de Educación Cultura y Deporte

Arata Momohara

Chiba University

Cooperative Institutions

Geological Survey of Japan

National Institute of Advanced Industrial Science and Technology

International Research Center for Japanese Studies

Nagoya University

University of Arizona

The University of Tokyo

Kyoto University

United States Geological Survey

Hokkaido University

University of Washington

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Holocene beach ridges record coastal uplift at 500 year interval due to unusually large earthquakes along Kuril Trench

AGU Fall Meeting Abstracts (2005)

Masanobu Shishikura Yuki Sawai Takanobu Kamataki Kenji Satake Yukinobu Okamura

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Transient Uplift After a 17th-Century Earthquake Along the Kuril Subduction Zone

Science (2004)

Yuki Sawai Kenji Satake Takanobu Kamataki Hiroo Nasu Masanobu Shishikura

In eastern Hokkaido, 60 to 80 kilometers above a subducting oceanic plate, tidal mudflats changed into freshwater forests during the first decades after a 17th-century tsunami. The mudflats gradually rose by a meter, as judged from fossil diatom assemblages. Both the tsunami and the ensuing uplift exceeded any in the region's 200 years of written history, and both resulted from a shallow plate-boundary earthquake of unusually large size along the Kuril subduction zone. This earthquake probably induced more creep farther down the plate boundary than did any of the region's historical events.

10.1126/science.1104895

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Citations (148)

Environmental archaeology at the Chengtoushan site, Hunan Province, China, and implications for environmental change and the rise and fall of the Yangtze River civilization

Quaternary International (2004)

Yoshinori Yasuda Toshiyuki Fujiki Hiroo Nasu Megumi Kato Yoshimune Morita

Human settlement

Yangtze river

10.1016/j.quaint.2004.02.016

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Citations (93)

Re-identification of plant impressions on prehistoric pottery from Ukraine

Journal of Archaeological Science Reports (2022)

Eiko Endo Hiroo Nasu Dmytro Haskevych Yakiv Gershkovych Мykhailo Videiko

Panicum miliaceum

Setaria

Chalcolithic

10.1016/j.jasrep.2022.103364

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Climate Deterioration and Angkor’s Demise

Advances in Asian human-environmental research (2012)

Yoshinori Yasuda Hiroo Nasu Toshiyuki Fujiki Kazuyoshi Yamada Junko Kitagawa

Demise

Paleoclimatology

10.1007/978-4-431-54111-0_10

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Re-Identification of Plant Impressions on Prehistoric Pottery from Ukraine

SSRN Electronic Journal (2021)

Eiko Endo Hiroo Nasu Dmytro Haskevych Yakiv Gershkovych Мykhailo Videiko

In this paper, we report newly obtained data on cereals from the Neolithic to Bronze Age from the northern side of the Black Sea. One part of the North Pontic area, located within present-day Ukraine, is one of the focal points of discussions on the agricultural dispersal between west and east Eurasia; however, existing reliable cereal data are scarce. In this study, we employed an improved silicone casting method to obtain impressions from pottery artifacts and conducted a survey of more than 30,000 pottery samples from different times. Observations of seed surface texture using scanning electron microscopy further improved the identification accuracy. The results showed no reliable cereal impressions in Ukrainian sub-Neolithic pottery, despite the predicted exceptionally early start of agriculture prior to the 6th millennium BC. In contrast, in Linear Band and Eneolithic pottery, cereals originating from West Asia were identified, although Chinese millet was absent. Meanwhile, abundant Panicum miliaceum impressions appeared abruptly with incidental barley and wheat in Late Bronze Age pottery. The Chinese millet species Setaria italica, which is clearly distinguishable from P. miliaceum using our method, was also not identified.

Panicum miliaceum

Setaria

Chalcolithic

10.2139/ssrn.3943533

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High-precision radiocarbon dating of political collapse and dynastic origins at the Maya site of Ceibal, Guatemala

Proceedings of the National Academy of Sciences (2017)

Takeshi Inomata Daniela Triadan Jessica MacLellan Melissa Burham Kazuo Aoyama

Significance Tracing political change through refined chronologies is a critical step for the study of social dynamics. Whereas coarse chronologies can give an impression of gradual change, better temporal control may reveal multiple episodes of rapid disruption comprised in that span. Precise dating through radiocarbon determinations and ceramic studies is particularly important for the study of the Preclassic collapse, which lacks calendrical dates recorded in texts. The high-precision chronology of Ceibal revealed waves of decline over the course of the Preclassic and Classic collapses in a temporal resolution that was not possible before. The emerging understanding of similarities and differences in the two cases of collapse provides an important basis for evaluating the vulnerability and resilience of Maya political systems.

Chronology

Maya

10.1073/pnas.1618022114

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Development of sedentary communities in the Maya lowlands: Coexisting mobile groups and public ceremonies at Ceibal, Guatemala

Proceedings of the National Academy of Sciences (2015)

Takeshi Inomata Jessica MacLellan Daniela Triadan Jessica Munson Melissa Burham

Significance The results of our research at the lowland Maya site of Ceibal add to the growing archaeological understanding that the transition to sedentism did not necessarily occur simultaneously across different social groups within a region and that monumental constructions did not always postdate fully established sedentism. Whereas sedentary and mobile populations are, in many cases, interpreted to have maintained separate communities, our study suggests that groups with different levels of mobility gathered and collaborated for constructions and public ceremonies. These data indicate that the development of sedentism was a complex process involving interactions among diverse groups, and that collaborative construction projects and communal gatherings played a critical role in this social transformation by facilitating social integration among different groups.

Maya

Ephemeral key

Elite

10.1073/pnas.1501212112

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Citations (105)

Aperiodic recurrence of geologically recorded tsunamis during the past 5500 years in eastern Hokkaido, Japan

Journal of Geophysical Research Atmospheres (2009)

Yuki Sawai Takanobu Kamataki Masanobu Shishikura Hiroo Nasu Yukinobu Okamura

Along Hokkaido's Pacific coast near the town of Kiritappu, sandy deposits in a muddy lagoon and on a nearby beach‐ridge plain provide evidence for 15 tsunamis between 200 and 6000 years ago. Additional sand beds at the lagoon probably represent the historical tsunamis of A.D. 1843 and 1894. We observed the sequences of sandy deposits in continuous slices 2 to 4 m deep. Some of the deposits consist of just a single sand bed, whereas others contain multiple units of sand, muddy sand (or sandy mud), and mud caps including plant detritus. We also found at the lagoon a 17th century tsunami deposit that thickens and thins regardless of elevation or distance inland. We bracketed the ages of most of the inferred tsunamis by radiocarbon dating of detritus, mainly seeds and leaves at the lagoon and charcoal at the beach‐ridge plain, from pretsunami and posttsunami beds. Tsunami dates computed from the bracketing ages commonly have uncertainties spanning 2 to 4 centuries. Within these uncertainties, the inferred sequence of 15 prehistoric tsunamis at the lagoon, beginning almost 6000 years ago, can be matched tsunami by tsunami with the inferred history at the beach‐ridge plain, 15 km away. The sand sheet extents suggest that most of these tsunamis were larger than any generated at Hokkaido in the last 200 years. The intervals between these inferred outsized tsunamis average nearly 400 years but range widely from about 100 to about 800 years.

Detritus

Coastal plain

10.1029/2007jb005503

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Citations (131)

Coastal uplift event recorded in salt marsh sediments along the Pacific coast of eastern Hokkaido, northern Japan

The American Journal of Gastroenterology (2004)

Yuki Sawai Kenji Satake Hiroo Nasu Takanobu Kamataki Masanobu Shishikura

Salt marsh

East coast

10.14866/ajg.2004f.0.57.0

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