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Seismology: tectonic strain in plate interiors?
E Calais1, G Mattioli, C DeMets
1Department of Earth and Atmospheric Sciences, Purdue University, West Lafayette, Indiana 47907, USA. ecalais@purdue.edu
Nature
|December 16, 2005
Summary
Understanding tectonic plate deformation and its link to earthquakes remains a challenge. New research challenges claims of significant deformation in the central US, suggesting only upper bounds for large earthquake magnitudes and recurrence intervals can currently be estimated.
Area of Science:
- Geophysics
- Tectonics
- Seismology
Background:
- The mechanisms driving deformation in the interior of tectonic plates are not fully understood.
- Large, infrequent earthquakes are associated with this intraplate deformation.
- Previous studies suggested significant surface deformation in the central United States.
Discussion:
- This study re-analyzed data used in a prior study suggesting high deformation rates in the central US.
- Three independent analyses found no statistically significant deformation.
- The findings challenge the interpretation of substantial surface deformation in this region.
Key Insights:
- Current data do not support claims of deformation rates comparable to plate boundaries in the central US.
- The study highlights the importance of rigorous statistical analysis in geodetic data.
- The research implies limitations in predicting earthquake behavior based on current intraplate deformation models.
Outlook:
- Further research is needed to understand the processes governing intraplate deformation.
- Improved geodetic data and analytical methods may refine our understanding of earthquake potential.
- Focus may shift towards establishing more robust upper bounds for earthquake magnitudes and recurrence intervals in stable continental regions.
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