Seismic interferometry with antipodal station pairs

In this study, we analyze continuous data from all Global Seismographic Network stations between year 2000 and 2009 and demonstrate that several body wave phases (e.g., PP, PcPPKP, SKSP, and PPS) propagating between nearly antipodal station pairs can be clearly observed without array stacking using...

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Bibliographic Details
Published in:Geophysical research letters 2013-09, Vol.40 (17), p.4609-4613
Main Authors: Lin, Fan-Chi, Tsai, Victor C.
Format: Article
Language:English
Subjects:
ambient noise
Antipodes
Arrays
body wave
coda
core phases
cross-correlation
Earth sciences
Earth, ocean, space
Earthquakes
Exact sciences and technology
Interferometry
Phases
Polypropylenes
Seismic activity
Seismic interferometry
Seismic phenomena
Stations
Wave propagation
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Summary:In this study, we analyze continuous data from all Global Seismographic Network stations between year 2000 and 2009 and demonstrate that several body wave phases (e.g., PP, PcPPKP, SKSP, and PPS) propagating between nearly antipodal station pairs can be clearly observed without array stacking using the noise/coda cross‐correlation method. Based on temporal correlations with global seismicity, we show that the observed body waves are clearly earthquake related. Moreover, based on single‐earthquake analysis, we show that the earthquake coda energy observed between ~10,000 and 30,000 s after a large earthquake contributes the majority of the signal. We refine our method based on these observations and show that the signal can be significantly improved by selecting only earthquake coda times. With our improved processing, the PKIKP phase, which does not benefit from the focusing effect near the antipode, can now also clearly be observed for long‐distance station pairs. Key Points Near‐antipodal body waves can be extracted using seismic interferometry The earthquake coda energy is important for the seismic interferometry to work The coda interferometry improves the SNR of the observed body waves
ISSN:0094-8276
1944-8007
DOI:10.1002/grl.50907