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Rock seismic anisotropy of the low‐velocity zone beneath the volcanic front in the mantle wedge
Author(s) -
Michibayashi Katsuyoshi,
Oohara Tatsuya,
Satsukawa Takako,
Ishimaru Satoko,
Arai Shoji,
Okrugin Victor M.
Publication year - 2009
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2009gl038527
Subject(s) - geology , peridotite , slab , mantle wedge , anisotropy , volcano , seismology , mantle (geology) , xenolith , transition zone , petrology , seismic anisotropy , olivine , wedge (geometry) , geophysics , subduction , geochemistry , tectonics , geometry , physics , quantum mechanics , mathematics
Peridotite xenoliths derived from the low velocity zone beneath the Avacha frontal volcano, Kamchatka, preserve a ‐axis slip fabrics, comparable with those in xenoliths from the back‐arc region of the NE Japan. Although low‐velocity zones are commonly attributed to zones of partially melted mantle, migration of the melt does not erase the existing olivine fabrics and related seismic anisotropies. These anisotropies may counteract the anisotropies associated with c ‐axis slip fabrics, if they exist, along the slab or in the high‐pressure zone.