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Beyond Plate Tectonics: Looking at Plate Deformation with Space Geodesy

Published online by Cambridge University Press:  03 August 2017

Thomas H. Jordan  and
J. Bernard Minster
Thomas H. Jordan
Affiliation:
Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139
J. Bernard Minster
Affiliation:
Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, La Jolla, CA 92093

Abstract

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We address the requirements that must be met by space-geodetic systems to place useful, new constraints on horizontal secular motions associated with the geological deformation of the earth's surface. Plate motions with characteristic speeds of about 50 mm/yr give rise to displacements that are easily observed by space geodesy. However, in order to improve the existing plate-motion models, the tangential components of relative velocities on interplate baselines must be resolved to an accuracy of < 3 mm/yr. Because motions considered small from a geodetic point of view have rather dramatic geological effects, especially when taken up as compression or extension of continental crust, detecting plate deformation by space-geodetic methods at a level that is geologically unresolvable places rather stringent requirements on the precision of the measurement systems: the tangential components on intraplate baselines must be observed with an accuracy of < 1 mm/yr. Among the measurements of horizontal secular motions that can be made by space geodesy, those pertaining to the rates within the broad zones of deformation characterizing the active continental plate boundaries are the most difficult to obtain by conventional ground-based geodetic and geological techniques. Measuring the velocities between crustal blocks to ± 5 mm/yr on 100-km to 1000-km length scales can yield geologically significant constraints on the integrated deformation rates across continental plate-boundary zones such as the western United States. However, baseline measurements in geologically complicated zones of deformation are useful only to the extent that the endpoints can be fixed in a local kinematical frame that includes major crustal blocks. For this purpose, the establishment of local geodetic networks around major VLBI and SLR sites in active areas should receive high priority.

Type
Geophysics
Information
Symposium - International Astronomical Union , Volume 129: The Impact of VLBI on Astrophysics and Geophysics , 1988 , pp. 341 - 350
Copyright
Copyright © Reidel 1988 

References

Agnew, D. C., et al., GPS measurements in central and southern California (abstract), Eos Trans. AGU, 68, 282, 1987.Google Scholar
Braile, L. W., Keller, G. R., Hinze, J. W., and Lidiak, E. G., An ancient rift complex and its relation to contemporary seismicity in the New Madrid seismic zone, Tectonics, 1, 225–237, 1982.Google Scholar
Chase, C. G., The n-plate problem of plate tectonics, Geophys. J. R. Astr. Soc., 29, 117–122, 1972.Google Scholar
Chase, C. G., Plate kinematics: the Americas, East Africa, and the rest of the world, Earth Planet. Sci. Lett., 37, 353–368, 1978.Google Scholar
Christodoulidis, D. C., Smith, D. E., Kolenkiewicz, R., Klosko, S. M., Torrence, M. H., and Dunn, P. J., Observing tectonic plate motions and deformations from satellite laser ranging, J. Geophys. Res., 90, 9249–9264, 1985.Google Scholar
Christodoulidis, D. C., Smith, D. E., Klosko, S. M., Robbins, J. W., Dunn, P. J., and Torrence, M. H., Tectonic motion in western USA from satellite laser ranging, preprint, 1987.Google Scholar
Clark, T., Ryan, J., Ma, C., Himwich, E., Gordon, D., and Mallama, A., Geodesy by radio interferometry: measurements of vector site motions in the western U.S. and Alaska (abstract), Eos Trans. AGU, 67, 906, 1986.Google Scholar
Crouch, J. K., Bachman, S. B., and Shay, J. T., Post-Miocene compressional tectonics along the central California margin, in Tectonics and Sedimentation along the California Margin , edited by Crouch, J. K. and Bachman, S. B., Pac. Sect. Soc. Econ. Paleontol. Mineral., 38, 37–54, 1984.Google Scholar
DeMets, C., Gordon, R. G., Stein, S., and Argus, D. F., A revised estimate of Pacific-North America motion and implications for western North America plate boundary zone tectonics, Geophys. Res. Lett., submitted, 1987.Google Scholar
Gawthrope, W. J., Seismicity and tectonics of the central California coastal region, in San Gregorio-Hosgri Fault Zone, California , edited by Silver, E. A. and Normark, W. R., Calif. Div. Mines Geol. Spec. Rept. 137, 45–56, 1978.Google Scholar
Goff, J. A., Bergman, E. A. and Solomon, S. C., Earthquake source mechanisms and transform fault tectonics in the Gulf of California, J. Geophys. Res., in press, 1987.Google Scholar
Golombeck, M. P., Geometry and rate of extension across the Pajarito fault zone, Espanola Basin, Rio Grande Rift, northern New Mexico, Geology, 9, 21–24, 1981.Google Scholar
Herring, T. A., and Shapiro, I. I., Geodesy by radio interferometry: stability of the North American plate, Eos Trans. AGU, 66, 848, 1985.Google Scholar
Herring, T. A., et al., Geodesy by radio interferometry: evidence for contemporary plate motion, J. Geophys. Res., 91, 8341–8347, 1986.Google Scholar
Johnson, A. C., and Nava, S. J., Recurrence rates and probability estimates for the New Madrid seismic zone, J. Geophys. Res., 90, 6737–6753, 1985.Google Scholar
Le Pichon, X., Sea-floor spreading and continental drift, J. Geophys. Res., 73, 3661–3697, 1968.CrossRefGoogle Scholar
Lyon-Caen, H., and Molnar, P., Gravity anomalies, flexure of the Indian plate, and the structure, support and evolution of the Himalaya and Ganga Basin, Tectonics, 4, 513–538, 1985.Google Scholar
Lyzenga, G. A., Wallace, K. S., Fanselow, J. L., Raefsky, A., and Groth, P. M., Tectonic motions in California inferred from very long baseline interferometry observations, J. Geophys. Res., 91, 9473–9487, 1986.Google Scholar
Minster, J. B., Jordan, T. H., Molnar, P., and Haines, E., Numerical modelling of instantaneous plate tectonics, Geophys. J. R. Astr. Soc., 36, 541–576, 1974.Google Scholar
Minster, J. B., and Jordan, T. H., Present-day plate motions, J. Geophys. Res., 83, 5331–5354, 1978.Google Scholar
Minster, J. B., and Jordan, T. H., PMOTION: interactive software for computing RM2-predicted relative motions and uncertainties between CDP sites, NASA Crustal Dynamics Project, unpublished technical report, April, 1983.Google Scholar
Minster, J. B., and Jordan, T. H., Vector constraints on Quaternary deformation of the western United States east and west of the San Andreas Fault, in Tectonics and Sedimentation along the California Margin , edited by Crouch, J. K. and Bachman, S. B., Pac. Sect. Soc. Econ. Paleontol. Mineral., 38, 1–16, 1984.Google Scholar
Minster, J. B., and Jordan, T. H., Vector constraints on western U.S. deformation from space geodesy, neotectonics and plate motions, J. Geophys. Res., 92, 4798–4804, 1987.Google Scholar
Molnar, P., and Deng, Q. D., Large earthquakes and average rate of deformation in Asia, J. Geophys. Res., 89, 6203–6228, 1984.Google Scholar
Nuttli, O. W., Average seismic source-parameter relations for mid-plate earthquakes, Bull. Seismol. Soc. Am., 73, 519–535, 1983.Google Scholar
Savage, J. C., Strain accumulation in western United States, Ann. Rev. Earth Planet. Sci., 11, 11–43, 1983.CrossRefGoogle Scholar
Savage, J. C., Lisowski, M., Prescott, W. H., and Sanford, A. R., Geodetic measurements of horizontal deformation across the Rio Grande Rift near Socorro, New Mexico, J. Geophys. Res., 85, 7215–7220, 1980.Google Scholar
Wallace, R. E., Patterns and timing of Late Quaternary faulting in the Great Basin province, and relation to some regional tectonic features, J. Geophys. Res., 89, 5763–5770, 1984.Google Scholar
Woodward, L. A., Rate of crustal extension across the Rio Grande Rift near Albuquerque, New Mexico, Geology, 5, 269–272, 1977.Google Scholar
Zoback, M. L., and Zoback, M., State of stress in the conterminous United States, J. Geophys. Res., 85, 6113–6156, 1980.Google Scholar