"Subsidence along the Atlantic Coast of North America: Insights from GP" by Makan A. Karegar, Timothy H. Dixon et al.
 

Document Type

Article

Publication Date

4-2016

Keywords

Holocene relative sea level, GPS, glacial isostatic adjustment, Atlantic Coast of North America, groundwater depletion

Digital Object Identifier (DOI)

https://doi.org/10.1002/2016GL068015

Abstract

The Atlantic Coast of North America is increasingly affected by flooding associated with tropical and extratropical storms, exacerbated by the combined effects of accelerated sea‐level rise and land subsidence. The region includes the collapsing forebulge of the Laurentide Ice Sheet. High‐quality records of late Holocene relative sea‐level (RSL) rise are now available, allowing separation of long‐term glacial isostatic adjustment‐induced displacement from modern vertical displacement measured by GPS. We compare geological records of late Holocene RSL to present‐day vertical rates from GPS. For many coastal areas there is no significant difference between these independent data. Exceptions occur in areas of recent excessive groundwater extraction, between Virginia (38°N) and South Carolina (32.5°N). The present‐day subsidence rates in these areas are approximately double the long‐term geologic rates, which has important implications for flood mitigation. Tide gauge records, therefore, should be used with caution for studying sea‐level rise in this region.

Was this content written or created while at USF?

Yes

Citation / Publisher Attribution

Geophysical Research Letters, v. 43, issue 7, p. 3126-3133

©2016. American Geophysical Union. All Rights Reserved.

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