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The case for dynamic subsidence of the U.S. east coast since the Eocene

Spasojević, Sonja and Liu, Lijun and Gurnis, Michael and Müller, R. Dietmar (2008) The case for dynamic subsidence of the U.S. east coast since the Eocene. Geophysical Research Letters, 35 (8). Art. No. L08305. ISSN 0094-8276. http://resolver.caltech.edu/CaltechAUTHORS:20101112-145452843

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Abstract

The dynamic subsidence of the United States east coast is addressed using the discrepancy between regional and global estimates of sea level, elevation of paleoshorelines, and adjoint models of mantle convection that assimilate plate motions and seismic tomography. The positions of Eocene and Miocene paleoshorelines are lower than predicted by global sea levels, suggesting at least 50 m, and possibly as much as 200 m of subsidence since the end of the Eocene. Dynamic models predict subsidence of the east coast since the end of Eocene, although the exact magnitude is uncertain. This subsidence has been occurring during an overall global sea-level fall, with the eustatic change being larger than the dynamic subsidence; this results in a regional sea-level fall in the absence of land subsidence. Dynamic subsidence is consistent with the difference between eustasy and regional sea level at the New Jersey coastal plain.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1029/2008GL033511DOIArticle
ORCID:
AuthorORCID
Gurnis, Michael0000-0003-1704-597X
Müller, R. Dietmar0000-0002-3334-5764
Additional Information:© 2008 American Geophysical Union. Received 4 February 2008; revised 16 March 2008; accepted 19 March 2008; published 22 April 2008. We thank Michelle Kominz and Ken Miller for helpful reviews. The CitcomS software was obtained from CIG (http://geodynamics.org). This is Contribution 8996 of the Division of Geological and Planetary Sciences and 87 of the Tectonics Observatory. Supported in part of NSF grant EAR-0609707 and by the Gordon and Betty Moore Foundation through the Caltech Tectonics Observatory.
Group:Caltech Tectonics Observatory, Seismological Laboratory
Funders:
Funding AgencyGrant Number
NSFEAR-0609707
Gordon and Betty Moore FoundationUNSPECIFIED
Subject Keywords:dynamic subsidence; geodynamic models; sea level
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Caltech Tectonics Observatory87
Caltech Division of Geological and Planetary Sciences8996
Record Number:CaltechAUTHORS:20101112-145452843
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20101112-145452843
Official Citation:Spasojević, S., L. Liu, M. Gurnis, and R. D. Müller (2008), The case for dynamic subsidence of the U.S. east coast since the Eocene, Geophys. Res. Lett., 35, L08305, doi:10.1029/2008GL033511.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:20782
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:17 Nov 2010 22:00
Last Modified:24 Oct 2017 20:14

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