Late Quaternary sea-level changes and palaeoseismology of the Bering Glacier region,Alaska |
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| Authors: | Ian Shennan |
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| Affiliation: | 1. School of Biological, Earth and Environmental Sciences, UNSW Australia, Sydney, NSW 2052, Australia;2. Institute for Environmental Research, Australian Nuclear and Science Technology Organisation, Locked Bag 2001, Kirrawee DC, NSW 2232, Australia;3. Escuela de Ciencias del Mar, Pontificia Universidad Católica de Valparaíso, Casilla (P.O. Box) 1020, Valparaíso 1, Chile;1. Instituto Dom Luiz and Departamento de Geologia, Faculdade de Ciências, Universidade de Lisboa, Edifício C6, Campo Grande, 1749-016 Lisboa, Portugal;2. Instituto Hidrográfico - Marinha, Rua das Trinas, 49, 1249-093 Lisboa, Portugal;3. NIOZ Royal Netherlands Institute for Sea Research, Texel, The Netherlands;4. Department of Earth Sciences, Geosciences Faculty, Utrecht University, Utrecht, The Netherlands;1. Geological Survey of Belgium, Royal Belgian Institute of Natural Sciences, Brussels, Belgium;2. Department of Geography, Durham University, United Kingdom;3. Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, Japan;4. School of History, Classics and Archaeology, Newcastle University, United Kingdom;5. Department of Geology and Soil Science, Ghent University, Belgium;6. Atmosphere and Ocean Research Institute, University of Tokyo, Japan;7. Department of Geography, University of Liège, Belgium;8. Institute of Geography, University of Cologne, Germany;9. Renard Centre of Marine Geology, Department of Geology and Soil Science, Ghent University, Belgium |
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| Abstract: | Glacial isostatic adjustment and multiple earthquake deformation cycles produce temporal and spatial variability in the records of relative sea-level change across south-central Alaska. Bering Glacier had retreated inland of the present coast by 16 ka BP and north of its present terminus by ～14 ka BP. Reconnaissance investigations in remote terrain provide new but limited insights of post-glacial relative sea-level change and the palaeoseismology of the region. Relative sea-level was above present ～9.2 ka BP to at least 5 ka BP before falling to below present. It was above present by the early 20th century, before land uplift in the 1964 M 9.2 earthquake. The pattern of relative sea-level change differs what may be expected in comparison with model predictions for other seismic and non-seismic locations. Buried mud–peat couplets show a great earthquake ～900 cal BP, including evidence of a tsunami. Correlation with other sites suggest simultaneous rupture of adjacent segments of the Aleutian megathrust and the Yakutat microplate. |
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