Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007geoji.170..649l&link_type=abstract
Geophysical Journal International, Volume 170, Issue 9, pp. 649-666.
Astronomy and Astrophysics
Astronomy
48
Ambient Noise, Cross-Correlations, Crustal Structure, New Zealand, Surface Waves, Tomography
Scientific paper
We present the first New Zealand-wide study of surface wave dispersion, using ambient noise observed at 42 broad-band stations in the national seismic network (GeoNet) and the Global Seismic Network (GSN). Year-long vertical-component time-series recorded between 2005 April 1 and 2006 March 31 have been correlated with one another to yield estimated fundamental mode Rayleigh wave Green's functions. We filter these Green's functions to compute Rayleigh wave group dispersion curves at periods of 5-50 s, using a phase-matched filter, frequency-time analysis technique. The uncertainties of the measurements are estimated based on the temporal variation of the dispersion curves revealed by 12 overlapping 3-month stacks. After selecting the highest quality dispersion curve measurements, we compute group velocity maps from 7 to 25 s period. These maps, and 1-D shear wave velocity models at four selected locations, exhibit clear correlations with major geological structures, including the Taranaki and Canterbury Basins, the Hikurangi accretionary prism, and previously reported basement terrane boundaries.
Bannister Stephen
Lin Fan-Chi
Ritzwoller Michael H.
Savage Martha Kane
Townend John
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