Mathematics – Logic
Scientific paper
Jul 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980natur.286...43a&link_type=abstract
Nature, Volume 286, Issue 5768, pp. 43-46 (1980).
Mathematics
Logic
19
Scientific paper
Most ultra-basic nodules that probably originated in the upper mantle have anisotropic petrofabric and elastic properties1,2. Within seismology, however, the Earth is generally assumed to be isotropic and this assumption is appropriate for most seismological studies. Thus, rocks can be considered isotropic on large scales although anisotropic on a scale of hand specimen3. This interpretation is questionable, however, in light of the increasing resolution of seismic observations. Many reliable reports on seismic anisotropies have been accumulating: for example, azimuthal anisotropy in Pn velocities in oceanic basins4, and in the continent5 and the back-arc basin6, and an S-wave splitting of the SH and SV waves revealing an anisotropic structure as deep as 190 km (ref. 7). These suggest that some unsuccessful detections of the Earth's anisotropies may be due to lack of appropriate observations. We describe here the recent discovery of shear wave anisotropy in a volcanic area in Japan, which was revealed by an improvement in the seismographic observation systems.
Ando Masataka
Ishikawa Yuzo
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