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Science 13 March 2009:
Vol. 323. no. 5920, p. 1442
DOI: 10.1126/science.1168122
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Brevia

Time-Variable Deformation in the New Madrid Seismic Zone

Eric Calais1 and Seth Stein2

New geodetic measurements show that the New Madrid is currently deforming too slowly, if at all, to account for large earthquakes in the region over the past 5000 years. This result, together with increasing evidence for temporal clustering and spatial migration of earthquake sequences in continental interiors, indicates that either tectonic loading rates or fault properties vary over a few thousand years.

1 Department of Earth and Atmospheric Sciences, Purdue University, West Lafayette, IN 47906, USA.
2 Department of Earth and Planetary Sciences, Northwestern University, Evanston, IL 60208, USA.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)