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Title: Is there a nascent plate boundary in the Northern Indian Ocean?
Authors: Coudurier‐Curveur, Aurélie
Karakaş, Ç.
Singh, S.
Tapponnier, P.
Carton, H.
Hananto, N.
Keywords: Science::Geology
Issue Date: 2020
Source: Coudurier‐Curveur, A., Karakaş, Ç., Singh, S., Tapponnier, P., Carton, H. & Hananto, N. (2020). Is there a nascent plate boundary in the Northern Indian Ocean?. Geophysical Research Letters, 47(7). doi:10.1029/2020GL087362
Journal: Geophysical Research Letters
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 (Mw = 8.6 and Mw = 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 60 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, subvertical 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 coseismic displacements recorded along F6a suggest that it may be a nascent plate boundary.
ISSN: 0094-8276
DOI: 10.1029/2020GL087362
Rights: © 2020 The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EOS Journal Articles

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