|Title:||Lower Mantle Substructure Embedded in the Farallon Plate: The Hess Conjugate||Authors:||YEN-TING KO
Helmberger, Don V.
|Keywords:||Farallon Plate | Hess conjugate | multipathing | waveform modeling||Issue Date:||28-Oct-2017||Publisher:||AMER GEOPHYSICAL UNION||Journal Volume:||44||Journal Issue:||20||Start page/Pages:||10216||Source:||Geophysical Research Letters||Abstract:||
©2017. American Geophysical Union. All Rights Reserved. The morphologies of subducted remnants in the lower mantle are essential to our understanding of the history of plate tectonism. Here we image a high-velocity slab-like (HVSL) anomaly beneath the southeastern U.S. using waveforms from five deep earthquakes beneath South America recorded by the USArray. In addition to travel time anomalies, the multipathing of S and ScS phases at different distances are used to constrain the HVSL model. We jointly invert S and ScS traveltimes, amplitudes, and waveform complexities to produce a best fitting block model characterized by a rectangular shape with a 2.5% S wave velocity increase and tapered edges. While the Farallon slab is expected to dip primarily eastward, the HVSL structure apparently dips 40° to 50° to the SE and appears to be related to the eclogitized Hess conjugate.
|Appears in Collections:||海洋研究所|
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