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Stability of earthquake moment tensor inversions: effect of the double-couple constraint 总被引:1,自引:0,他引:1
We show that spurious large non-double-couple components can be obtained in inversions for the full deviatoric moment tensor for shallow crustal earthquakes due to inaccurate Earth models. The traditional “best double-couple” solution does not in general provide an optimal estimate of a double-couple mechanism, and is only reliable when the non-double-couple component of the full deviatoric solution is small. The inverse problem for the moment tensors of the 1998 Antarctic Plate and 2000 Wharton Basin strike-slip earthquakes is shown in each case to have two well-fitting minima in the misfit function of pure double-couple solutions. Such pairs of solutions are most likely to exist for earthquakes which are close either to vertical strike-slip or to dip-slip on a fault plane dipping at 45°. It is shown theoretically that these pairs of solutions arise from the combination of the pure double-couple constraint and the instability of two elements of the moment tensor. No significant non-double-couple component is found for the shallow thrusting 1996 Biak, Indonesia earthquake. 相似文献
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A. M. Dziewonski J. E. Franzen J. H. Woodhouse 《Physics of the Earth and Planetary Interiors》1985,40(4):249-258
Centroid-moment tensor solutions are presented for 170 earthquakes that occurred during the first quarter of 1985. The solutions are obtained using corrections for aspherical Earth structure. 相似文献
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A.M. Dziewonski J.E. Franzen J.H. Woodhouse 《Physics of the Earth and Planetary Interiors》1984,34(4):209-219
Centroid-moment tensor solutions are presented for 148 earthquakes that occurred during the first quarter of 1984. The solutions are obtained using corrections for aspherical Earth structure. 相似文献
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A.M. Dziewonski J.E. Franzen J.H. Woodhouse 《Physics of the Earth and Planetary Interiors》1983,33(4):243-249
Centroid-moment tensor solutions are presented for 99 earthquakes that occurred during the second quarter of 1983. 相似文献
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Woodhouse I.H. Izzawati Wallington E.D. Turner D. 《Geoscience and Remote Sensing Letters, IEEE》2006,3(3):344-348
This letter investigates the edge effects on the tree height retrieval over coniferous plantations using X-band interferometry. A coherent version of the water cloud model is used to evaluate the influence of observation conditions such as incidence angle, tree height, and slope, each of which affects the extent of areas affected by edge effects. Results from the model simulation are discussed in the context of actual X-band data over pine plantations. A generic expression to indicate the extent of edge effects is described. 相似文献