Imaging subducted slab structure beneath the Sea of Okhotsk with teleseismic waveforms

TitleImaging subducted slab structure beneath the Sea of Okhotsk with teleseismic waveforms
Publication TypeJournal Article
Year of Publication2014
AuthorsZhan Z.W, Helmberger D.V, Li D.Z
JournalPhysics of the Earth and Planetary Interiors
Date Published2014/07
Type of ArticleArticle
ISBN Number0031-9201
Accession NumberWOS:000337859400004
Keywordsdepth; earthquakes; Finite difference; high-velocity; island arcs; lower mantle; northwest; p-wave; pacific; penetration; s-waves; seismic constraints; Slab structure; subduction zone; Teleseismic waveform

The structure of subducted slabs is not well imaged in most global tomographic models with anomalies typically less than 1%. Synthetic waveforms for such models are not noticeably different from their 1D reference models. In contrast, we find that observed teleseismic waveforms sampling slabs in the down-dip direction display multipathing features indicative of substantial structure. Such waveform complexity patterns appear distinctly different for various source locations with outer-rise events generally displaying relatively simple waveforms. Here, we model these waveform patterns for a portion of the Kuril subduction zone. The best fitting slab models have relatively fast cores (similar to 5%) with smooth edges compatible with thermal modeling in shape. Complete seismograms for these 2D models indicate that multibounce P and S waves are slab-sensitive and can be used in refining models. (C) 2014 Elsevier B.V. All rights reserved.

Short TitlePhys. Earth Planet. Inter.
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