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Extracting seismic core phases with array interferometry

Lin, Fan-Chi and Tsai, Victor C. and Schmandt, Brandon and Duputel, Zacharie and Zhan, Zhongwen (2013) Extracting seismic core phases with array interferometry. Geophysical Research Letters, 40 (6). pp. 1049-1053. ISSN 0094-8276. doi:10.1002/grl.50237.

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Seismic body waves that sample Earth's core are indispensable for studying the most remote regions of the planet. Traditional core phase studies rely on well-defined earthquake signals, which are spatially and temporally limited. We show that, by stacking ambient-noise cross-correlations between USArray seismometers, body wave phases reflected off the outer core (ScS), and twice refracted through the inner core (PKIKP^2) can be clearly extracted. Temporal correlation between the amplitude of these core phases and global seismicity suggests that the signals originate from distant earthquakes and emerge due to array interferometry. Similar results from a seismic array in New Zealand demonstrate that our approach is applicable in other regions and with fewer station pairs. Extraction of core phases by interferometry can significantly improve the spatial sampling of the deep Earth because the technique can be applied anywhere broadband seismic arrays exist.

Item Type:Article
Related URLs:
URLURL TypeDescription
Lin, Fan-Chi0000-0003-0394-6830
Tsai, Victor C.0000-0003-1809-6672
Schmandt, Brandon0000-0003-1049-9020
Zhan, Zhongwen0000-0002-5586-2607
Additional Information:© 2013 American Geophysical Union. Received 17 December 2012; revised 5 February 2013; accepted 6 February 2013; published 26 March 2013. The authors thank Michael Ritzwoller, Xiaodong Song, and an anonymous reviewer for comments that helped to improve this paper. The facilities of the IRIS Data Management Center and the New Zealand GeoNet Project provided the waveform data used in this study.
Group:Seismological Laboratory
Subject Keywords:Core phases; Seismic interferometry; Body waves; cross-correlation
Issue or Number:6
Record Number:CaltechAUTHORS:20130627-095929812
Persistent URL:
Official Citation:Lin, F.-C., V. C. Tsai, B. Schmandt, Z. Duputel, and Z. Zhan (2013), Extracting seismic core phases with array interferometry, Geophys. Res. Lett., 40, 1049–1053, doi:10.1002/grl.50237.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:39122
Deposited On:27 Jun 2013 20:23
Last Modified:09 Nov 2021 23:42

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