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Deep azimuthal seismic anisotropy in the southern Kurile and Japan subduction zones

Author:
Sandvol, Eric   Ni, James  


Journal:
Journal of Geophysical Research


Issue Date:
1997


Abstract(summary):

Shear wave splitting parameters of local and teleseismic S waves from intermediate and deep earthquakes in the southern Kurile and Japan subduction zones are combined with splitting parameters obtained from SKS and SKKS waves to determine depth variation in shear wave splitting both above and below the earthquake. Local S wave splitting results measured at station MAJO (Matsushiro, Japan) and at YSS (Yuzhno Sakhalinsk, Russia) combine to indicate that very little splitting occurs in the asthenosphere below the southern Kurile slab at about 450 km depth. S waves from deep earthquakes beneath MDJ (Mudanjiang, Heilongjiang Province, China) show ~1.0 s of lag time, while SKKS results show ~1.6 s of lag time. This difference in shear wave splitting lag times indicates significant variation in azimuthal anisotropy beneath a minimum depth of 350 km. This inference is consistent with the source-side splitting of ~0.8 s lag time observed from deep teleseismic S waves which traverse the lower parts of the upper mantle and the upper mantle/lower mantle boundary. A plausible explanation for the presence of deep seismic anisotropy is that shear wave splitting is occurring in the metastable olivine in the flattened and broadened southern Japan slab. Another explanation for these observations is the presence of an anisotropic layer composed primarily of highly anisotropic beta-spinel at the base of the 410-km discontinuity


Page:
9911


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