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| Titel |
Slab deformation and seismicity |
| VerfasserIn |
T. W. Becker, L. A. Alpert, I. W. Bailey, M. S. Miller |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250061826
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| Zusammenfassung |
| The dynamics of plate tectonics depend on slab and asthenospheric
viscosity, yet a range of macroscopic diagnostics such as plate
kinematics and the geoid yield non-unique inferences. This motivates
renewed efforts to evaluate the co-seismic, in-slab strain imaged by
earthquake moment tensor solutions in the light of mantle flow
models. We discuss results from global, high resolution mantle
circulation modeling and reanalysis of the global Centroid Moment
Tensor (gCMT) earthquake catalog. We show that first order patterns in
slab seismicity can be explained by the stresses as predicted from our
flow models. The style of deep slab deformation indicates a
sensitivity to slab and lower mantle viscosity, and net rotations of
the lithosphere with respect to the lower mantle. The non-double
couple (CLVD) radiation pattern component of seismicity increases with
depth, and such a behavior is predicted by the flow models, providing
a first physical model of such CLVD systematics. The geodynamic
modeling results can be interpreted as a simple reference model
against which individual subduction zone patterns can be compared,
expanding our set of constraints for understanding regional and global
force transmission in upper mantle convection. |
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