B-type olivine fabric and mantle wedge serpentinization beneath the Ryukyu arc
نویسندگان
چکیده
منابع مشابه
Olivine fabric transitions and shear wave anisotropy in the Ryukyu subduction system
Recent shear wave splitting measurements from the fore-arc region of the Ryukyu subduction system show large magnitude (0.3–1.6 s) trenchparallel splitting in both local and teleseismic phases. The similarity of splitting parameters associated with shallow local-S and teleseismic phases suggests that the source of anisotropy is located in the fore-arc mantle. One explanation for this pattern of...
متن کاملB-type olivine fabric in the mantle wedge: Insights from high-resolution non-Newtonian subduction zone models
Several hypotheses have been proposed to explain trench-parallel shear wave splitting in the mantle wedge of subduction zones. These include 3-D flow effects, parallel melt filled cracks, and B-type olivine fabric. We predict the distribution of Btype and other fabrics with high-resolution thermal and stress models of subduction zones. A composite viscous rheology is used that incorporates wet ...
متن کاملStress, strain, and B-type olivine fabric in the fore-arc mantle: Sensitivity tests using high-resolution steady-state subduction zone models
[1] Shear-wave splitting observations at several subduction systems show trench-parallel fast directions in the fore-arc mantle. The presence of B-type olivine fabric in the mantle wedge may provide an explanation for this pattern of anisotropy under low-temperature and hydrated conditions. Sensitivity tests are shown that provide insights into the distribution and magnitude of B-type fabric us...
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چکیده ندارد.
Evidence for serpentinization of the forearc mantle wedge along the Nicoya Peninsula, Costa Rica
[1] Characterizing the hydration state of the forearc mantle wedge yields valuable information on frictional stability at the downdip edge of subduction megathrusts. Simultaneous inversion of Pand S-wave arrival times collected as part of the Costa Rica Seismogenic Zone Experiment yields 1D and 3D Pand S-wave velocity models (VP and VS) for the Nicoya Peninsula segment of the Middle America Tre...
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ژورنال
عنوان ژورنال: Geophysical Research Letters
سال: 2013
ISSN: 0094-8276
DOI: 10.1002/grl.50369