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. doi:10.1029/2018GL081130. https://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.
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| 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 | ||||||||||||||
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| Subject Keywords: | ULVZ; mid‐Pacific; LLSVP ScS | ||||||||||||||
| Issue or Number: | 6 | ||||||||||||||
| DOI: | 10.1029/2018GL081130 | ||||||||||||||
| Record Number: | CaltechAUTHORS:20190215-152553385 | ||||||||||||||
| Persistent URL: | https://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: | 16 Nov 2021 16:54 |
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