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    Present-day stress orientation in Thailand's basins

    155447_155447.pdf (1.921Mb)
    Access Status
    Open access
    Authors
    Tingay, Mark
    Morley, C.
    Hillis, R.
    Meyer, J.
    Date
    2010
    Type
    Journal Article
    
    Metadata
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    Citation
    Tingay, Mark R.P. and Morley, Chris K. and Hillis, Richard R. and Meyer, Jeremy. 2010. Present-day stress orientation in Thailand's basins. Journal of Structural Geology. 32 (2): pp. 235-248.
    Source Title
    Journal of Structural Geology
    DOI
    10.1016/j.jsg.2009.11.008
    ISSN
    0191-8141
    School
    Department of Applied Geology
    Remarks

    NOTICE: This is the author’s version of a work that was accepted for publication in Journal of Structural Geology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to thiswork since it was submitted for publication. A definitive version was subsequently published in Journal of Structural Geology [32, 2, 2010] DOI 10.1016/j.jsg.2009.11.008

    URI
    http://hdl.handle.net/20.500.11937/44286
    Collection
    • Curtin Research Publications
    Abstract

    The Cenozoic tectonic evolution of Thailand is widely considered to have been primarily controlled by forces generated at the eastern Himalayan syntaxis. This hypothesis is supported by earthquakes in northern Indochina and southern China, which reveal a fan-shaped present-day maximum horizontal stress (SHmax) pattern centered on the eastern Himalayan syntaxis. However, the distance to which forces generated by the Himalayan syntaxis influence the stress pattern in Indochina is not known. We analyzed caliper and image logs from 106 petroleum wells for borehole breakouts and drilling-induced fractures. A total of 558 breakouts and 45 drilling-induced fractures were interpreted in six basins, indicating that a north–south regional present-day SHmax exists in central and southern Thailand and the Gulf of Thailand. The N–S SHmax orientation suggests that forces generated at the Himalayan syntaxis are a major control on the stress pattern throughout Thailand, extending approximately 1000 km beyond the outer limit of syntaxis-associated seismicity.Despite the influence of the Himalayan syntaxis on the present-day stress field, the sedimentary basins of central, southern and offshore Thailand are characterized by structural styles that are somewhat inconsistent with those predicted to result from India–Eurasia collision. Furthermore, localized variations in SHmax orientation, and the predominance of structures associated with purely extensional rifting, indicate that other processes also influence the stress field in Thailand. We suggest that stresses generated by the Sumatran–Andaman subduction zone may also have resulted in significant deformation in offshore Thailand and that the stress pattern may also be perturbed at very local (several km) scales by mechanically weak faults.

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