Article Dans Une Revue Science Advances Année : 2017

The discovery of a conjugate system of faults in the Wharton Basin intraplate deformation zone

Nugroho Hananto
  • Fonction : Auteur
Paul Tapponnier
  • Fonction : Auteur
Shengji Wei
  • Fonction : Auteur
Adam B Nugroho
  • Fonction : Auteur
Wishnu A Gemilang
  • Fonction : Auteur
Kerry Sieh
  • Fonction : Auteur
Sylvain Barbot
  • Fonction : Auteur

Résumé

The deformation at well-defined, narrow plate boundaries depends on the relative plate motion, but how the deformation takes place within a distributed plate boundary zone remains a conundrum. This was confirmed by the seismological analyses of the 2012 great Wharton Basin earthquakes [moment magnitude (M w) 8.6], which suggested the rupture of several faults at high angles to one another. Using high-resolution bathymetry and seismic reflection data, we report the discovery of new N294°E-striking shear zones, oblique to the plate fabric. These shear zones are expressed by sets of normal faults striking at N335°E, defining the direction of the principal compressional stress in the region. Also, we have imaged left-lateral strike-slip faults along reactivated N7°E-oriented oceanic fracture zones. The shear zones and the reactivated fracture zones form a conjugate system of faults, which accommodate present-day intraplate deformation in the Wharton Basin.

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Dates et versions

hal-02378628 , version 1 (07-01-2021)

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Satish C Singh, Nugroho Hananto, Yanfang Qin, Frédérique Leclerc, Praditya Avianto, et al.. The discovery of a conjugate system of faults in the Wharton Basin intraplate deformation zone. Science Advances , 2017, 3 (1), pp.e1601689. ⟨10.1126/sciadv.1601689⟩. ⟨hal-02378628⟩
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