Genesis of a new slab tear fault in the Indo-Australian plate, offshore northern Sumatra, Indian ocean

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• 作者：Basab Mukhopadhyay (1)
  Sujit Dasgupta (2)
  
• 关键词：Slab ; tear fault ; New tear fault (NTF) ; Rupture ; Intra ; plate Oceanic environment ; Northern Sumatra ; 2012 Sumatra Earthquake (M 8.6) ; 2004 Great Sumatra Earthquake (M 9.2)
• 刊名：Journal of the Geological Society of India
• 出版年：2014
• 出版时间：May 2014
• 年：2014
• 卷：83
• 期：5
• 页码：493-500
• 全文大小：
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• 作者单位：Basab Mukhopadhyay (1)
  Sujit Dasgupta (2)
  
  1. Geological Survey of India, 27 J. L. Nehru Road, Kolkata, 700016, India
  2. Ex. Geological Survey of India, 27 J. L. Nehru Road, Kolkata, 700016, India
  
• ISSN：0974-6889

文摘

Following the December 2004 and March 2005 major shallow foci inter-plate earthquakes in the north Sumatra region, a slab-tear fault located within the subducting Indian plate ruptured across the West Sunda Trench (WST) within the marginal intra-plate region. Trend, length and movement pattern of this New Tear Fault (NTF) segment is almost identical to another such slab-tear fault mapped previously by Hamilton (1979), located around 160 km south of NTF. Seismic activity along the NTF remained quasi-stable till the end of the year 2011, when an earthquake of magnitude 7.2 occurred on 10.01.2012 just at the tip of NTF, only around ?00 km within the intra-plate domain west of WST. The NTF rupture propagated further towards SSW with the generation of two more large earthquakes on 11.04.2012. The foreshock (10.01.12; M7.2) -mainshock (11.04.12; M 8.6) -aftershock (11.04.12; M 8.2) sequence along with numerous smaller magnitude aftershocks unmistakably define the extension of NTF, a slab-tear fault that results tectonic segmentation of the convergent plate margin. Within the intra-plate domain most earthquakes display consistent left-lateral strike slip mechanism along NNE trending fault plane.