open access

https://hdl.handle.net/2115/57347

Estimation of azimuthal anisotropy in the NW Pacific from seismic ambient noise in seafloor records

英語

Dynamics of lithosphere and mantle

2014-10

Oxford University Press

Geophysical Journal International

199(1)

11-22

We analysed background surface waves in seismic ambient noise by cross-correlating continuous records of eight ocean bottom seismometers and nine differential pressure gauges deployed in the northwestern Pacific Ocean by the PLATE project. After estimating the clock delay and instrumental phase responses of differential pressure gauges by using cross-correlation functions, we measured average phase velocities in the area of the array for the fundamental-, first higher- and second higher-mode Rayleigh waves, and the fundamental-mode Love waves at a period range of 3-40 s by waveform fitting. We then measured phase-velocity anomalies of fundamental-mode and first higher-mode Rayleigh waves for each pair of stations at a period range of 5-25 s, and corrected the effect of variation in water-depths. The seismic anomalies imply the presence of strong azimuthal anisotropy beneath the eastern part of array. The direction of maximum velocity is approximately N35A degrees E in the fossil seafloor spreading direction perpendicular to magnetic lineations from the ancient triple junction at this location. The peak-to-peak intensity of shear-wave velocity anisotropy in the mantle is similar to 7 per cent.

学術雑誌論文

Version of Record

This article has been accepted for publication in "Geophysical Journal International" © The Authors 2014. Published by Oxford University Press on behalf of The Royal Astronomical Society.

0956-540X

1365-246X