Location of high-frequency P wave microseismic noise in the Pacific Ocean using multiple small aperture arrays
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Univ. of Utah, Salt Lake City, UT (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
We investigate source locations of P wave microseisms within a narrow frequency band (0.67–1.33 Hz) that is significantly higher than the classic microseism band (~0.05–0.3 Hz). Employing a backprojection method, we analyze data recorded during January 2010 from five International Monitoring System arrays that border the Pacific Ocean. We develop a ranking scheme that allows us to combine beam power from multiple arrays to obtain robust locations of the microseisms. Some individual arrays exhibit a strong regional component, but results from the combination of all arrays show high-frequency P wave energy emanating from the North Pacific basin, in general agreement with previous observations in the double-frequency (DF) microseism band (~0.1–0.3 Hz). Furthermore, this suggests that the North Pacific source of ambient P noise covers a broad range of frequencies and that the wave-wave interaction model is likely valid at shorter periods.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC52-07NA27344; AC52-06NA25396
- OSTI ID:
- 1184169
- Alternate ID(s):
- OSTI ID: 1321755; OSTI ID: 1402298
- Report Number(s):
- LLNL-JRNL-667212; LA-UR-15-21040
- Journal Information:
- Geophysical Research Letters, Vol. 42, Issue 8; ISSN 0094-8276
- Publisher:
- American Geophysical UnionCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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