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Is there a Nascent Plate Boundary in the Northern Indian Ocean?

Abstract : The northern Indian Ocean has been widely recognized as an area of broadly distributed deformation within the composite India-Australia-Capricorn plate, hosting several diffuse boundary zones and a diffuse triple junction. The occurrence, along reactivated fracture zones, of the exceptionally large (M w =8.6 and M w =8.2) 2012 Wharton Basin strike-slip earthquakes, however, questions whether this composite plate is breaking apart along a discrete boundary. Using recent bathymetric and seismic data, we analyze the most prominent fracture zone (F6a), whose structural trace is particularly well-expressed. We identify sixty kilometric-scale pull-apart basins with geometric properties (length/width ratios) similar to those observed along continental strike-slip plate boundaries. Four of the pull-aparts formed above narrow, sub-vertical faults extending into the oceanic crust. Within the broad Wharton deformation zone, the significant slip rates (0.8 to 2.5 mm/yr) and unusually large co-seismic displacements recorded along F6a suggest that it may be a nascent plate boundary
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Submitted on : Thursday, March 26, 2020 - 5:53:48 PM
Last modification on : Friday, June 12, 2020 - 5:38:05 PM

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Aurélie Coudurier-Curveur, Çağıl Karakaş, Satish C. Singh, Paul Tapponnier, Hélène Carton, et al.. Is there a Nascent Plate Boundary in the Northern Indian Ocean?. PsychNology Journal, PsychNology Journal, 2020, ⟨10.1029/2020GL087362⟩. ⟨insu-02520618⟩



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