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Slab Control on the Northeastern Edge of the Mid-Pacific LLSVP near Hawaii

Sun, D. and Helmberger, D. and Lai, V. H. and Gurnis, M. and Jackson, J. M. and Yang, H.-Y. (2019) Slab Control on the Northeastern Edge of the Mid-Pacific LLSVP near Hawaii. Geophysical Research Letters, 46 (6). pp. 3142-3152. ISSN 0094-8276. http://resolver.caltech.edu/CaltechAUTHORS:20190215-152553385

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Abstract

At the core‐mantle boundary, most observed ultralow velocity zones (ULVZs) cluster along the edges of the large low shear velocity provinces (LLSVPs) and provide key information on the composition, dynamics, and evolution of the lower mantle. However, their detailed structure near slab‐like structures beneath the mid‐Pacific remains particularly challenging because of the lack of station coverage. While most studies of ULVZs concentrate on SKS‐complexity, here we report on the multipathing of ScS, which expands the sampling for ULVZs. We find the strongest multipathing along a ULVZ patch located just south of Hawaii and the far northeastern edge of the LLSVP, in a zone ~200 km in width and extending 600 km southward. The anomalous ScS travel times and distorted S_(diff) waveforms further reveal patches interrupted by observed enhanced D″ indicative of slab‐debris influence on the complexity of the northeastern boundary of the mid‐Pacific LLSVP.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1029/2018GL081130DOIArticle
ORCID:
AuthorORCID
Sun, D.0000-0003-4461-4664
Lai, V. H.0000-0002-0738-0187
Gurnis, M.0000-0003-1704-597X
Jackson, J. M.0000-0002-8256-6336
Additional Information:© 2019 American Geophysical Union. Received 29 OCT 2018; Accepted 13 FEB 2019; Accepted article online 15 FEB 2019; Published online 19 MAR 2019. The authors would like to thank Editor Jeroen Ritsema and two anonymous reviewers. Their suggestions and comments were greatly appreciated and lead to significant improvements to the manuscript. We thank the IRIS Data Center and Earthscope USArray for providing the seismic data, which are available at the IRIS website (http://www.iris.edu). All maps in this paper were produced using GMT developed by Paul Wessel and Walter H.F. Smith. We are thankful to Strategic Priority Research Program (B) of Chinese Academy of Sciences, Grant XDB18000000; National Natural Science Foundation of China 41574037; Chinese MOST 973 program 2014CB845901; Key Research Program of Frontier Sciences CAS, Grant QYZDB‐SSWSYS011; Fundamental Research Funds for the Central Universities in China WK2080000078; and the NSF CSEDI EAR‐1161046 for support of this research.
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
Chinese Academy of SciencesXDB18000000
National Natural Science Foundation of China41574037
Ministry of Science and Technology (China)2014CB845901
Chinese Academy of SciencesQYZDB-SSWSYS011
Fundamental Research Funds for the Central Universities in China WK2080000078
NSFEAR-1161046
Subject Keywords:ULVZ; mid‐Pacific; LLSVP ScS
Record Number:CaltechAUTHORS:20190215-152553385
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20190215-152553385
Official Citation:Sun, D., Helmberger, D., Lai, V. H., Gurnis, M., Jackson, J. M., & Yang, H.‐Y. (2019). Slab control on the northeastern edge of the mid‐Pacific LLSVP near Hawaii. Geophysical Research Letters, 46, 3142–3152. https://doi.org/10.1029/2018GL081130
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:92961
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:19 Feb 2019 22:43
Last Modified:17 Apr 2019 16:57

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