Constraining sediment provenance for tsunami deposits using distributions of grain size and foraminifera from the Kujukuri coastline and shelf, Japan
Tsunami deposits preserved in the geological record provide a more comprehensive understanding of their patterns of frequency and intensity over longer timescales; but recognizing tsunami deposits can prove challenging due to post-depositional changes, lack of contrast between the deposits and surro...
| Main Authors: | , , , , , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2020
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/137476 |
| _version_ | 1811677358766161920 |
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| author | Pilarczyk, Jessica E. Sawai, Yuki Matsumoto, Dan Namegaya, Yuichi Nishida, Naohisa Ikehara, Ken Fujiwara, Osamu Gouramanis, Chris Dura, Tina Horton, Benjamin Peter |
| author2 | Asian School of the Environment |
| author_facet | Asian School of the Environment Pilarczyk, Jessica E. Sawai, Yuki Matsumoto, Dan Namegaya, Yuichi Nishida, Naohisa Ikehara, Ken Fujiwara, Osamu Gouramanis, Chris Dura, Tina Horton, Benjamin Peter |
| author_sort | Pilarczyk, Jessica E. |
| collection | NTU |
| description | Tsunami deposits preserved in the geological record provide a more comprehensive understanding of their patterns of frequency and intensity over longer timescales; but recognizing tsunami deposits can prove challenging due to post-depositional changes, lack of contrast between the deposits and surrounding sedimentary layers, and differentiating between tsunami and storm deposition. Modern baseline studies address these challenges by providing insight into modern spatial distributions that can be compared with palaeotsunami deposits. This study documents the spatial fingerprint of grain size and foraminifera from Hasunuma Beach and the Kujukuri shelf to provide a basis from which tsunami deposits can be interpreted. At Hasunuma Beach, approximately 50 km east of Tokyo, the spatial distribution of three common proxies (foraminiferal taxonomy, foraminiferal taphonomy and sediment grain size) for tsunami identification were mapped and clustered using Partitioning Around Medoids cluster analysis. Partitioning Around Medoids cluster analysis objectively discriminated two coastal zones corresponding to onshore and offshore sample locations. Results show that onshore samples are characterized by coarser grain sizes (medium to coarse sand) and higher abundances of Pararotalia nipponica (27 to 63%) than offshore samples, which are characterized by finer grain sizes (fine to medium sand), lower abundances of Pararotalia nipponica (2 to 19%) and Ammonia parkinsoniana (0 to 10%), higher abundances of planktonics (15 to 58%) and species with fragile tests including Uvigerinella glabra. When compared to grain-size and foraminiferal taxonomy, foraminiferal taphonomy; i.e. surface condition of foraminifera, a proxy not commonly used to identify tsunami deposits, was most effective in discriminating modern coastal zones (identified supratidal, intertidal and offshore environments) and determining sediment provenance for tsunami deposits at Kujukuri. This modern baseline study assists the interpretation of tsunami deposits in the geological record because it provides a basis for sediment provenance to be determined. |
| first_indexed | 2024-10-01T02:36:06Z |
| format | Journal Article |
| id | ntu-10356/137476 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T02:36:06Z |
| publishDate | 2020 |
| record_format | dspace |
| spelling | ntu-10356/1374762023-02-28T16:39:35Z Constraining sediment provenance for tsunami deposits using distributions of grain size and foraminifera from the Kujukuri coastline and shelf, Japan Pilarczyk, Jessica E. Sawai, Yuki Matsumoto, Dan Namegaya, Yuichi Nishida, Naohisa Ikehara, Ken Fujiwara, Osamu Gouramanis, Chris Dura, Tina Horton, Benjamin Peter Asian School of the Environment Earth Observatory of Singapore Science::Geology Cluster Analysis Coastal Hazards Tsunami deposits preserved in the geological record provide a more comprehensive understanding of their patterns of frequency and intensity over longer timescales; but recognizing tsunami deposits can prove challenging due to post-depositional changes, lack of contrast between the deposits and surrounding sedimentary layers, and differentiating between tsunami and storm deposition. Modern baseline studies address these challenges by providing insight into modern spatial distributions that can be compared with palaeotsunami deposits. This study documents the spatial fingerprint of grain size and foraminifera from Hasunuma Beach and the Kujukuri shelf to provide a basis from which tsunami deposits can be interpreted. At Hasunuma Beach, approximately 50 km east of Tokyo, the spatial distribution of three common proxies (foraminiferal taxonomy, foraminiferal taphonomy and sediment grain size) for tsunami identification were mapped and clustered using Partitioning Around Medoids cluster analysis. Partitioning Around Medoids cluster analysis objectively discriminated two coastal zones corresponding to onshore and offshore sample locations. Results show that onshore samples are characterized by coarser grain sizes (medium to coarse sand) and higher abundances of Pararotalia nipponica (27 to 63%) than offshore samples, which are characterized by finer grain sizes (fine to medium sand), lower abundances of Pararotalia nipponica (2 to 19%) and Ammonia parkinsoniana (0 to 10%), higher abundances of planktonics (15 to 58%) and species with fragile tests including Uvigerinella glabra. When compared to grain-size and foraminiferal taxonomy, foraminiferal taphonomy; i.e. surface condition of foraminifera, a proxy not commonly used to identify tsunami deposits, was most effective in discriminating modern coastal zones (identified supratidal, intertidal and offshore environments) and determining sediment provenance for tsunami deposits at Kujukuri. This modern baseline study assists the interpretation of tsunami deposits in the geological record because it provides a basis for sediment provenance to be determined. NRF (Natl Research Foundation, S’pore) MOE (Min. of Education, S’pore) Published version 2020-03-30T04:23:21Z 2020-03-30T04:23:21Z 2019 Journal Article Pilarczyk, J. E., Sawai, Y., Matsumoto, D., Namegaya, Y., Nishida, N., Ikehara, K., ... Horton, B. P. (2019). Constraining sediment provenance for tsunami deposits using distributions of grain size and foraminifera from the Kujukuri coastline and shelf, Japan. Sedimentology, 67(3), 1373-1392. doi:10.1111/sed.12591 0037-0746 https://hdl.handle.net/10356/137476 10.1111/sed.12591 2-s2.0-85065175122 3 67 1373 1392 en Sedimentology © 2019 The Authors. Sedimentology published by John Wiley & Sons Ltd on behalf of International Association of Sedimentologists. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. application/pdf |
| spellingShingle | Science::Geology Cluster Analysis Coastal Hazards Pilarczyk, Jessica E. Sawai, Yuki Matsumoto, Dan Namegaya, Yuichi Nishida, Naohisa Ikehara, Ken Fujiwara, Osamu Gouramanis, Chris Dura, Tina Horton, Benjamin Peter Constraining sediment provenance for tsunami deposits using distributions of grain size and foraminifera from the Kujukuri coastline and shelf, Japan |
| title | Constraining sediment provenance for tsunami deposits using distributions of grain size and foraminifera from the Kujukuri coastline and shelf, Japan |
| title_full | Constraining sediment provenance for tsunami deposits using distributions of grain size and foraminifera from the Kujukuri coastline and shelf, Japan |
| title_fullStr | Constraining sediment provenance for tsunami deposits using distributions of grain size and foraminifera from the Kujukuri coastline and shelf, Japan |
| title_full_unstemmed | Constraining sediment provenance for tsunami deposits using distributions of grain size and foraminifera from the Kujukuri coastline and shelf, Japan |
| title_short | Constraining sediment provenance for tsunami deposits using distributions of grain size and foraminifera from the Kujukuri coastline and shelf, Japan |
| title_sort | constraining sediment provenance for tsunami deposits using distributions of grain size and foraminifera from the kujukuri coastline and shelf japan |
| topic | Science::Geology Cluster Analysis Coastal Hazards |
| url | https://hdl.handle.net/10356/137476 |
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