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High-resolution probing of inner core structure with seismic interferometry

Huang, Hsin-Hua and Lin, Fan-Chi and Tsai, Victor C. and Koper, Keith D. (2015) High-resolution probing of inner core structure with seismic interferometry. Geophysical Research Letters, 42 (24). pp. 10622-10630. ISSN 0094-8276. http://resolver.caltech.edu/CaltechAUTHORS:20160218-105113138

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Abstract

Increasing complexity of Earth's inner core has been revealed in recent decades as the global distribution of seismic stations has improved. The uneven distribution of earthquakes, however, still causes a biased geographical sampling of the inner core. Recent developments in seismic interferometry, which allow for the retrieval of core-sensitive body waves propagating between two receivers, can significantly improve ray path coverage of the inner core. In this study, we apply such earthquake coda interferometry to 1846 USArray stations deployed across the U.S. from 2004 through 2013. Clear inner core phases PKIKP^2 and PKIIKP^2 are observed across the entire array. Spatial analysis of the differential travel time residuals between the two phases reveals significant short-wavelength variation and implies the existence of strong structural variability in the deep Earth. A linear N-S trending anomaly across the middle of the U.S. may reflect an asymmetric quasi-hemispherical structure deep within the inner core with boundaries of 99°W and 88°E.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1002/2015GL066390DOIArticle
http://onlinelibrary.wiley.com/doi/10.1002/2015GL066390/abstractPublisherArticle
ORCID:
AuthorORCID
Tsai, Victor C.0000-0003-1809-6672
Additional Information:© 2015 American Geophysical Union. Received 29 SEP 2015; Accepted 5 DEC 2015; Accepted article online 9 DEC 2015; Published online 23 DEC 2015. We thank Alex Song for helpful discussion. We also thank H. Tkalcic and an anonymous reviewer for their constructive comments. All waveform data used in this study can be downloaded from the IRIS Data Management Center. This work was supported by National Science Foundation grants EAR-1316348 and CyberSEES-1442665, the King Abdullah University of Science and Technology (KAUST) under award OCRF-2014-CRG3-2300, and the Ministry of Science and Technology, Taiwan, grant 104-2917-I-564-052.
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
NSFEAR-1316348
NSFCyberSEES-1442665
King Abdullah University of Science and Technology (KAUST)OCRF-2014-CRG3-2300
Ministry of Science and Technology (Taipei)104-2917-I-564-052
Record Number:CaltechAUTHORS:20160218-105113138
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20160218-105113138
Official Citation:Huang, H.-H., F.-C. Lin, V. C. Tsai, and K. D. Koper (2015), High-resolution probing of inner core structure with seismic interferometry, Geophys. Res. Lett., 42, 10,622–10,630, doi:10.1002/2015GL066390.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:64550
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:19 Feb 2016 00:05
Last Modified:23 Nov 2016 19:20

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