The origins of the intraplate stress field in continental Australia

David D. Coblentz, Mike Sandiford, Randall Richardson, Shaohua Zhou, Richard Hillis

Research output: Contribution to journalArticle

122 Citations (Scopus)

Abstract

The ridge push force acting on the Indo-Australian plate exerts a significant torque (8.5 × 1025N m) about a pole at 30.3°N, 34.5°E. The angular difference between this torque pole and the observed pole of rotation for the plate (19.2°N, 35.6°E) is less than 12° and suggests that the ridge push force plays an important role in the dynamics of the Indo-Australian plate. We have used an elastic finite-element analysis to study the predicted intraplate stress field in continental Australia for four models which employ different boundary conditions to balance the ridge push torque acting on the plate. The modeling indicates that a number of important features of the observed stress field within the Australian continent can be explained in terms of balancing the ridge push torque with resistance imposed along the Himalaya, Papua New Guinea, and New Zealand collisional boundaries segments. These features include NS-to NE-SW-oriented compression in the northern Australia and E-W-oriented compression in southern Australia. Our analysis also shows that subduction processes along the northern and eastern boundaries provide only second-order controls on the intraplate stress field in continental Australia.

Original languageEnglish (US)
Pages (from-to)299-309
Number of pages11
JournalEarth and Planetary Science Letters
Volume133
Issue number3-4
DOIs
StatePublished - 1995

Fingerprint

torque
stress field
stress distribution
ridges
Torque
Australian plate
Poles
poles
compression
Papua New Guinea
New Zealand
continents
boundary condition
subduction
Boundary conditions
boundary conditions
Finite element method
modeling
analysis

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)
  • Geochemistry and Petrology
  • Geophysics
  • Space and Planetary Science
  • Earth and Planetary Sciences(all)
  • Environmental Science(all)

Cite this

The origins of the intraplate stress field in continental Australia. / Coblentz, David D.; Sandiford, Mike; Richardson, Randall; Zhou, Shaohua; Hillis, Richard.

In: Earth and Planetary Science Letters, Vol. 133, No. 3-4, 1995, p. 299-309.

Research output: Contribution to journalArticle

Coblentz, David D. ; Sandiford, Mike ; Richardson, Randall ; Zhou, Shaohua ; Hillis, Richard. / The origins of the intraplate stress field in continental Australia. In: Earth and Planetary Science Letters. 1995 ; Vol. 133, No. 3-4. pp. 299-309.
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