Crustal and upper mantle structure of the northwestern North Island, New Zealand, from seismic refraction data

Autor: Tim Stern, Euan G. C. Smith, K. J. Muirhead, Fred Davey
Rok vydání: 1987
Předmět:
Zdroj: Geophysical Journal International. 91:913-936
ISSN: 1365-246X
0956-540X
DOI: 10.1111/j.1365-246x.1987.tb01674.x
Popis: Summary. The crustal and upper mantle structure of the northwestern North lsland of New Zealand is derived from the results of a seismic refraction experiment; shots were fired at the ends and middle of a 575 km-long line extending from Lake Taupo to Cape Reinga. The principal finding from the experiment is that the crust is 25 f 2 km thick, and is underlain by what is interpreted to be an upper mantle of seismic velocity 7.6 f 0.1 km s-', that increases to 7.9 km s-l at a depth of about 45 km. Crustal seismic velocities vary between 5.3 and 6.36 km s-l with an average value of 6.04 km s-'. There are close geophysical and geological similarities between the northwestern North Island of New Zealand and the Basin and Range province of the western United States. In particular, the conditions of low upper-mantle seismic velocities, thin crust with respect to surface elevation, and high heatflow (70-100 mW m-') observed in these two areas can be ascribed to their respective positions behind an active convergent margin for about the past 20 Myr.
Databáze: OpenAIRE
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