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

Kaustubh Thirumalai (), Frederick W. Taylor, Chuan-Chou Shen, Luc L. Lavier, Cliff Frohlich, Laura M. Wallace, Chung-Che Wu, Hailong Sun and Alison K. Papabatu
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Kaustubh Thirumalai: Institute for Geophysics, Jackson School of Geosciences, University of Texas at Austin, J. J. Pickle Research Campus
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
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
Alison K. Papabatu: Energy, and Water Resources

Nature Communications, 2015, vol. 6, issue 1, 1-6

Abstract: 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.

Date: 2015
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DOI: 10.1038/ncomms8607

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