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, Alison K. Papabatu

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

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 M w 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.

Original languageEnglish (US)
Article number7607
JournalNature communications
Volume6
DOIs
StatePublished - Jun 30 2015
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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