Abstract
Seismologists are becoming increasingly aware of the ubiquity of anisotropy, albeit mostly weak. This is partly due to field observations and partly to the results of measurements in the laboratory. Furthermore, it has been known for a long time that layering of distinct isotropic media at subwavelength scales can cause “apparent anisotropy.” If unaccounted for, this anisotropy can result in distortion of tomographic images to the point of affecting their interpretation. C.H. Chapman and R.G. Pratt, in Traveltime tomography in anisotropic media: Theory (Geophysical Journal International 1992), show how anisotropy may most generally be included in a 2-D tomographic inversion, resulting in a requirement for five distinct parameter fields.
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