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• W2105656935 abstract "We present an analysis of seismic noise recorded during 1995-2004 by a medium-aperture, short-period seismic array located in Chiang Mai, Thailand (CMAR). We calculated frequency-wavenumber spectra for nearly 1000 randomly selected time windows, each with a length of 160 sec. At frequencies above about 1.4 Hz the noise is unorganized and the wavenumber spectra are isotropic and dif- fuse; however, at lower frequencies three robust wavenumber peaks exist. Two of the peaks have phase velocities centered near 4:0 km=sec, consistent with higher- mode Rayleigh waves, while the third peak has much higher apparent velocity (>25 km=sec), consistent with body waves that have interacted with the Earth's core (PKP, PcP). All three peaks are strongly seasonal with annual power variations of 10- 20 dB, and all show excellent correlation in their putative source regions with ocean wave heights derived from TOPEX/POSEIDON satellite tracks. To the best of our knowledge, this is the first time such a high-velocity component of seismic noise has been consistently observed. The presence of this high-velocity peak raises the possibility of using ambient noise to image the Earth's lower mantle and core." @default.
• W2105656935 created "2016-06-24" @default.
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• W2105656935 date "2008-01-01" @default.
• W2105656935 modified "2023-09-27" @default.
• W2105656935 title "Short Note Seasonal Anisotropy in Short-Period Seismic Noise Recorded in South Asia" @default.
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