Physics
Scientific paper
Oct 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30tsde8p&link_type=abstract
Geophysical Research Letters, Volume 30, Issue 20, pp. SDE 8-1, CiteID 2051, DOI 10.1029/2003GL017758
Physics
2
Seismology: Continental Crust (1242), Structural Geology: Fractures And Faults, Tectonophysics: Continental Contractional Orogenic Belts, Tectonophysics: Continental Tectonics-General (0905), Tectonophysics: Plate Boundary-General (3040)
Scientific paper
A high resolution active source dataset recorded across the Southern Alps of New Zealand displays unusually strong S-wave phases, which show minimal shear wave splitting. A suite of methods was used to analyse the data to minimize the uncertainty in the anisotropy measurements. We use the Silver and Chan [1991] method, cross correlation of stacked data, and deconvolution in combination with the other methods. The results were consistent at each station, but differed between stations. Fault-parallel fast directions with delay times of 0-0.08 s were calculated from the most impulsive S-wave arrivals. The crustal rocks from the Southern Alps are strongly anisotropic in the laboratory, contrasting with results shown here. The minimal delay times suggest that the shear waves are affected by multiple phases of deformation in the crust.
Pulford Anna
Savage Martha
Stern Tim
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