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

S. C. Singh | Zendy; Nugroho D. Hananto | Zendy; Yanfang Qin | Zendy; Frédérique Leclerc | Zendy; Praditya Avianto | Zendy; Paul Tapponnier | Zendy; H. D. Carton | Zendy; Shengji Wei | Zendy; Adam Budi Nugroho | Zendy; Wishnu A. Gemilang | Zendy; Kerry Sieh | Zendy; Sylvain Barbot | Zendy

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

Author(s) -

S. C. Singh,

Nugroho D. Hananto,

Yanfang Qin,

Frédérique Leclerc,

Praditya Avianto,

Paul Tapponnier,

H. D. Carton,

Shengji Wei,

Adam Budi Nugroho,

Wishnu A. Gemilang,

Kerry Sieh,

Sylvain Barbot

Publication year - 2017

Publication title -

science advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 5.928

H-Index - 146

ISSN - 2375-2548

DOI - 10.1126/sciadv.1601689

Subject(s) - intraplate earthquake , geology , seismology , oblique case , shear (geology) , bathymetry , echelon formation , shear zone , structural basin , deformation (meteorology) , geometry , fault (geology) , petrology , tectonics , geomorphology , linguistics , philosophy , oceanography , mathematics

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 (Mw) 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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