Fundamental and higher-mode Rayleigh wave characteristics of ambient seismic noise in New Zealand

Details Fundamental and higher-mode Rayleigh wave characteristics of ambient seismic noise in New Zealand Fundamental and higher-mode Rayleigh wave characteristics of ambient seismic noise in New Zealand

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3623303b&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 23, CiteID L23303

Physics

3

Seismology: Surface Waves And Free Oscillations, Seismology: Lithosphere (1236), Seismology: Tomography (6982, 8180)

Scientific paper

In order to use ambient seismic noise for mapping Earth's structure, it is important to understand the spatio-temporal characteristics of the noise field. This study uses data collected during four austral winter months of 2002 to investigate New Zealand's ambient seismic noise field in the double-ocean-wave-frequency range (0.1-0.3 Hz). It is shown via beamforming analysis that there are two distinct dispersive waves in the data. These waves can be separated. Their estimated phase velocities (2.5-2 and 4-3 km/s in the frequency range 0.14-0.25 Hz) match well with fundamental and higher-mode Rayleigh dispersion curves. Studies of double-wave-frequency microseisms elsewhere generally show the Rayleigh noise fields to be dominated by fundamental mode waves. The reason why higher-mode signals are observed here may reflect a combination of long ocean wave periods, large waveheights, the direct deep water approach to narrow continental margins, and the proximity of the seismograph array to the source regions.

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