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- W2003005196 abstract "Tomographic inversion of seismic amplitudes for attenuation structure has been applied to first arrival amplitudes from a seismic refraction profile across the Juan de Fuca Ridge to further constrain a velocity structure previously obtained by travel time‐velocity tomography and to obtain a model for attenuation variations within the shallow crust. Amplitude analysis has identified an additional boundary, defined by a decrease in vertical velocity gradient, at ∼2.0 km subbottom which was not required by the travel time data. This transition zone likely represents the oceanic layer 2‐layer 3 boundary. The analysis also identified zones of relatively high attenuation ( Q E ∼ 20–100) at subbottom depths of 0.3–2.0 km beneath the ridge axis which correlate well with low‐velocity zones (velocities reduced by <0.4 km/s) in the velocity model. The subaxial zone is interpreted as a region of increased fracture porosity and/or permeability associated with axial hydrothermal circulation within the extrusives and sheeted dike complex." @default.
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- W2003005196 date "1994-02-10" @default.
- W2003005196 modified "2023-10-17" @default.
- W2003005196 title "Seismic attenuation structure beneath the Juan de Fuca Ridge from tomographic inversion of amplitudes" @default.
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- W2003005196 doi "https://doi.org/10.1029/93jb02039" @default.
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