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. doi:10.1002/2015GL066390. https://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.
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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 | ||||||||||
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Issue or Number: | 24 | ||||||||||
DOI: | 10.1002/2015GL066390 | ||||||||||
Record Number: | CaltechAUTHORS:20160218-105113138 | ||||||||||
Persistent URL: | https://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: | 10 Nov 2021 23:32 |
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