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Direct Detection of Sharp Upper-Mantle Structures Beneath the Western United States

This study investigates complex upper-mantle structures beneath the western United States using waveform complexity analysis from South American events and DLR amplitude data. Our findings reveal that many TA waveforms exhibit significant complexity (ΔLR), influenced by multi-pathing effects. Larger ΔLR values correlate with more complex waveforms and are often associated with low amplitudes. Notably, an azimuthal dependency in ΔLR indicates that these anomalies predominantly dip to the south. These insights contribute to our understanding of the upper-mantle's geology in this region.

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Direct Detection of Sharp Upper-Mantle Structures Beneath the Western United States

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  1. Direct Detection of Sharp Upper-Mantle Structures Beneath the Western United States Using Waveform Complexity Analysis South American event Complexity (DLR) Amplitude Data-Synth (DT) • Many TA waveforms exhibit significant complexity (ΔLR) that can be described by a multi-pathingeffect • Larger ΔLR values = more complex waveform • Large ΔLR values are associated with low amplitudes. • Azimuthal dependence in ΔLRis observed, suggesting that the anomalies in the upper-mantle beneath western US mainly dip to the south. Kamchatka event • [Sun and Helmberger, 2011, GJI]

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