期刊
GEOPHYSICAL RESEARCH LETTERS
卷 40, 期 17, 页码 4609-4613出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/grl.50907
关键词
Seismic interferometry; body wave; cross-correlation; coda; ambient noise; core phases
资金
- NSF [EAR- 1316348]
- Division Of Earth Sciences
- Directorate For Geosciences [1316348] Funding Source: National Science Foundation
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 similar to 10,000 and 30,000s 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.
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