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Variable Holocene deformation above a shallow subduction zone extremely close to the trench

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  • Kaustubh Thirumalai

    (Institute for Geophysics, Jackson School of Geosciences, University of Texas at Austin, J. J. Pickle Research Campus
    Jackson School of Geosciences, University of Texas at Austin)

  • Frederick W. Taylor

    (Institute for Geophysics, Jackson School of Geosciences, University of Texas at Austin, J. J. Pickle Research Campus)

  • Chuan-Chou Shen

    (High-Precision Mass Spectrometry and Environment Change Laboratory (HISPEC), National Taiwan University)

  • Luc L. Lavier

    (Institute for Geophysics, Jackson School of Geosciences, University of Texas at Austin, J. J. Pickle Research Campus
    Jackson School of Geosciences, University of Texas at Austin)

  • Cliff Frohlich

    (Institute for Geophysics, Jackson School of Geosciences, University of Texas at Austin, J. J. Pickle Research Campus)

  • Laura M. Wallace

    (Institute for Geophysics, Jackson School of Geosciences, University of Texas at Austin, J. J. Pickle Research Campus)

  • Chung-Che Wu

    (High-Precision Mass Spectrometry and Environment Change Laboratory (HISPEC), National Taiwan University)

  • Hailong Sun

    (High-Precision Mass Spectrometry and Environment Change Laboratory (HISPEC), National Taiwan University
    The State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences)

  • Alison K. Papabatu

    (Energy, and Water Resources)

Abstract

Histories of vertical crustal motions at convergent margins offer fundamental insights into the relationship between interplate slip and permanent deformation. Moreover, past abrupt motions are proxies for potential tsunamigenic earthquakes and benefit hazard assessment. Well-dated records are required to understand the relationship between past earthquakes and Holocene vertical deformation. Here we measure elevations and 230Th ages of in situ corals raised above the sea level in the western Solomon Islands to build an uplift event history overlying the seismogenic zone, extremely close to the trench (4–40 km). We find marked spatiotemporal heterogeneity in uplift from mid-Holocene to present: some areas accrue more permanent uplift than others. Thus, uplift imposed during the 1 April 2007 Mw 8.1 event may be retained in some locations but removed in others before the next megathrust rupture. This variability suggests significant changes in strain accumulation and the interplate thrust process from one event to the next.

Suggested Citation

  • Kaustubh Thirumalai & Frederick W. Taylor & Chuan-Chou Shen & Luc L. Lavier & Cliff Frohlich & Laura M. Wallace & Chung-Che Wu & Hailong Sun & Alison K. Papabatu, 2015. "Variable Holocene deformation above a shallow subduction zone extremely close to the trench," Nature Communications, Nature, vol. 6(1), pages 1-6, November.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms8607
    DOI: 10.1038/ncomms8607
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