2015
DOI: 10.1002/2015gc006017
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Toward the reconciliation of seismological and petrological perspectives on oceanic lithosphere heterogeneity

Abstract: The character of the high‐frequency seismic phases Po and So, observed after propagation for long distances in the oceanic lithosphere, requires the presence of scattering from complex structure in 3‐D. Current models use stochastic representations of seismic structure in the oceanic lithosphere. The observations are compatible with quasi‐laminate features with horizontal correlation length around 10 km and vertical correlation length 0.5 km, with a uniform level of about 2% variation through the full thicknes… Show more

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Cited by 24 publications
(27 citation statements)
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“…Kennett and Furumura [] show that pervasive stochastic heterogeneities with horizontal and vertical correlation lengths of ∼10 km and ∼0.5 km, respectively, provide a good explanation for their P o/ S o observations. Since such quasi‐laminated petrological fabrics would manifest themselves in the form of radial anisotropy, when seen by longer‐period surface waves, Kennett and Furumura [] suggest the level of heterogeneity as a potential ξ proxy.…”
Section: Discussionmentioning
confidence: 99%
“…Kennett and Furumura [] show that pervasive stochastic heterogeneities with horizontal and vertical correlation lengths of ∼10 km and ∼0.5 km, respectively, provide a good explanation for their P o/ S o observations. Since such quasi‐laminated petrological fabrics would manifest themselves in the form of radial anisotropy, when seen by longer‐period surface waves, Kennett and Furumura [] suggest the level of heterogeneity as a potential ξ proxy.…”
Section: Discussionmentioning
confidence: 99%
“…The Pn phase is distinguishable by its high frequency content (3–30 Hz), typically emergent onset, long coda, and a move‐out velocity around 8 km/s. Scattering, possibly from elongate lithospheric heterogeneities, in combination with sediment and water column reverberations generates an emergent waveform with a coda that decays slowly over many tens of seconds (Kennett & Furumura, , ; Sereno & Orcutt, ). Scattering near the source region may obscure the polarity of the Pn onset adding further complexity to the waveform.…”
Section: Methodsmentioning
confidence: 99%
“…The model of small‐scale heterogeneity in the subducting slab also builds on Furumura and Kennett [], using a von Karmán distribution function with horizontal correlation length of a h = 10 km along the plate dip direction and much shorter correlation distance of a z = 0.5 km across the plate thickness. Based on the work of Kennett and Furumura [], we introduce a sinusoidally increasing strength of heterogeneities with standard deviation ε ranging from 0.5% at the top to 2.5% at the bottom of the slab, superimposed on the background P and S wave velocities and densities of the oceanic mantle (80% of the standard deviation for P and S wave speeds). The heterogeneity model in the continental and oceanic crust are modeled by a h = 0.25 km and a z = 0.5 km with ε = 2%, and much larger scale but weaker heterogeneity ( a h = 20 km, a z = 5 km, ε = 1%) is introduced in the mantle.…”
Section: Fdm Simulations Of Deep Slab Eventsmentioning
confidence: 99%