Seismic and geodetic constraints on plate boundary deformation across the northern Macquarie Ridge and southern South Island of New Zealand

Details Seismic and geodetic constraints on plate boundary deformation across the northern Macquarie Ridge and southern South Island of New Zealand Seismic and geodetic constraints on plate boundary deformation across the northern Macquarie Ridge and southern South Island of New Zealand

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000geoji.143..847m&link_type=abstract

Geophysical Journal International, Volume 143, Issue 3, pp. 847-880.

Astronomy and Astrophysics

Astronomy

5

Crustal Deformation, Earthquakes, Fault Plane Solutions, Seismotectonics

Scientific paper

In the southern New Zealand region the boundary between the Australian and Pacific plates changes from oblique continental convergence in the central South Island of New Zealand to interoceanic transcurrent motion along the Macquarie Ridge. Source parameters of recent (post-1964) upper crustal events, Mw>=5.3, in the region 43-53°S, 155-175°E are determined using P- and SH-waveform analysis in order to investigate the nature of strain accommodated seismically throughout the region. Repeated occupation of three geodetic networks across the southern South Island provides estimates of contemporary crustal strain. Seismicity over the last 35 years shows uneven spatial and temporal distribution, with clusters of events occurring in regions along the plate boundary that exhibit structural variation. Focal mechanisms of individual earthquakes vary widely but are consistent with the accommodation of long-term estimates of the relative plate motion. Across the southern South Island, geodetically measured principal contraction directions are consistent with P-axis orientations. The mode of accommodation of the relative plate motion varies throughout the region, influenced by the change in crustal composition on either side of the plate boundary, the underlying structure as a relic of previous relative motions, and the variation of obliquity of the relative motion with respect to these structures.

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