Journal
QUATERNARY SCIENCE REVIEWS
Volume 113, Issue -, Pages 78-92Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.quascirev.2014.12.001
Keywords
Sea-level database; Cascadia subduction zone; Pacific North America; Glacial isostatic adjustment; Holocene
Funding
- NSF [EAR-1419844]
- BPH [EAR-1052848, EAR-1419824]
- REK [ARC-1203415]
- French government through the A*MIDEX project [ANR-11-LABX-0061, ANR-11-IDEX-0001-02]
- Earthquake Hazards Program of the U.S. Geological Survey (USGS)
- Division Of Earth Sciences
- Directorate For Geosciences [1419844, 1419366] Funding Source: National Science Foundation
- Division Of Earth Sciences
- Directorate For Geosciences [1419824] Funding Source: National Science Foundation
- Office of Polar Programs (OPP)
- Directorate For Geosciences [1203415] Funding Source: National Science Foundation
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A database of published and new relative sea-level (RSL) data for the past 16 ka constrains the sea-level histories of the Pacific coast of central North America (southern British Columbia to central California). Our reevaluation of the stratigraphic context and radiocarbon age of sea-level indicators from geological and archaeological investigations yields 600 sea-level index points and 241 sea-level limiting points. We subdivided the database into 12 regions based on the availability of data, tectonic setting, and distance from the former Cordilleran ice sheet. Most index (95%) and limiting points (54%) are <7 ka; older data come mainly from British Columbia and San Francisco Bay. The stratigraphic position of points was used as a first-order assessment of compaction. Formerly glaciated areas show variable RSL change; where data are present, highstands of RSL occur immediately post-deglaciation and in the mid to late Holocene. Sites at the periphery and distant to formerly glaciated areas demonstrate a continuous rise in RSL with a decreasing rate through time due to the collapse of the peripheral forebulge and the reduction in meltwater input during deglaciation. Late Holocene RSL change varies spatially from falling at 0.7 +/- 0.8 mm a(-1) in southern British Columbia to rising at 1.5 +/- 0.3 mm a(-1) in California. The different sea-level histories are an ongoing isostatic response to deglaciation of the Cordilleran and Laurentide Ice Sheets. (C) 2014 Elsevier Ltd. All rights reserved.
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