S-wave splitting in the offshore South Island, New Zealand : insights into plate-boundary deformation
Karalliyadda, Sapthala C.
Savage, Martha K.
Sheehan, Anne F.
Collins, John A.
Zietlow, Daniel W.
MetadataShow full item record
Local and regional S-wave splitting in the offshore South Island of the New Zealand plate-boundary zone provides constraints on the spatial and depth extent of the anisotropic structure with an enhanced resolution relative to land-based and SKS studies. The combined analysis of offshore and land measurements using splitting tomography suggests plate-boundary shear dominates in the central and northern South Island. The width of this shear zone in the central South Island is about 200 km, but is complicated by stress-controlled anisotropy at shallow levels. In northern South Island, a broader (>200 km) zone of plate-boundary parallel anisotropy is associated with the transitional faulting between the Alpine fault and Hikurangi subduction and the Hikurangi subduction zone itself. These results suggest S-phases of deep events (∼90 km) in the central South Island are sensitive to plate-boundary derived NE-SW aligned anisotropic media in the upper-lithosphere, supporting a “thin viscous sheet” deformation model.
Author Posting. © American Geophysical Union, 2015. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geochemistry, Geophysics, Geosystems 16 (2015): 2829–2847, doi:10.1002/2015GC005882.
Suggested CitationArticle: Karalliyadda, Sapthala C., Savage, Martha K., Sheehan, Anne F., Collins, John A., Zietlow, Daniel W., Shelley, Adrian, "S-wave splitting in the offshore South Island, New Zealand : insights into plate-boundary deformation", Geochemistry, Geophysics, Geosystems 16 (2015): 2829–2847, DOI:10.1002/2015GC005882, https://hdl.handle.net/1912/7692
Showing items related by title, author, creator and subject.
Deformation of the Pacific/North America plate boundary at Queen Charlotte Fault : the possible role of rheology ten Brink, Uri S.; Miller, Nathaniel C.; Andrews, Brian D.; Brothers, Daniel S.; Haeussler, Peter J. (John Wiley & Sons, 2018-03-30)The Pacific/North America (PA/NA) plate boundary between Vancouver Island and Alaska is similar to the PA/NA boundary in California in its kinematic history and the rate and azimuth of current relative motion, yet their ...
Ding, Min; Lin, Jian (John Wiley & Sons, 2016-09-03)We conducted numerical experiments to simulate elastoplastic deformation of the overriding plate caused by a subducted seamount. Calculations revealed development of a distinct pair of fault-like shear zones, including a ...
Garland, Elizabeth D.; Mullineaux, Lauren S. (Woods Hole Oceanographic Institution, 1992-06)Patterns and rates of particle contact onto flat plates in steady unidirectional flows were investigated in a laboratory flume. Plates with three leading edge configurations (faired, bluff and split) were used to generate ...