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Jade, Sridevi
- Seismotectonic Implications of Strike-Slip Earthquakes in the Darjiling-Sikkim Himalaya
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Authors
Affiliations
1 Department of Earth Sciences, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, IN
2 CSIR-4PI, Formerly CSIR-CMMACS, Wind Tunnel Road, Bangalore 560 037, IN
3 Department of Geology, University of Calcutta, 35 Ballygunge Circular Road, Kolkata 700 019, IN
1 Department of Earth Sciences, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, IN
2 CSIR-4PI, Formerly CSIR-CMMACS, Wind Tunnel Road, Bangalore 560 037, IN
3 Department of Geology, University of Calcutta, 35 Ballygunge Circular Road, Kolkata 700 019, IN
Source
Current Science, Vol 106, No 2 (2014), Pagination: 198-210Abstract
The Darjiling-Sikkim Himalaya (DSH) is located over the Dharan-Gorubathan salient-recess pair and moderate thrust and strike-slip earthquake occur here. The hypocentres cluster not only near the location of the Main Himalayan Thrust (MHT) or the basal decollement of the Himalayan wedge, but also well above and below it. The epicentres cluster over the mapped location of the Lesser Himalayan Duplex (LHD), suggesting that both MHT and LHD are active structures in DSH. The earthquakes below MHT can be related to transverse strike-slip faulting in DSH associated with salient-recess transition on both flanks of the Dharan salient. The 18 September 2011 (Mw 6.9) strike-slip event suggests that the western flank of the Dharan salient is also likely to contain an active transverse strike-slip fault like the Gish Transverse Fault (GTF) on its eastern flank. High-precision Global Positioning System measurements (1997-2006) indicate that a maximum of ∼4 mm/year convergence is being accommodated in the Tista Half-Window or LHD west of the surface trace of GTF and DSH is locked south of 27°N both east and west of GTF about 10 km north of the Himalayan mountain front. About 3-4 mm/year sinistral strike-slip is postulated on GTF north of 27°N. Dislocation based forward modelling using two thrust dislocations with oblique slip and a sinistral strike-slip dislocation generated velocities that were closest to the measured back-slip velocity field in DSH.Keywords
Darjiling–Sikkim Himalaya, Dislocation Modelling, Global Positioning System, Gish Transverse Fault, Recess, Salient, Seismicity.- GNSS and its Impact on Position Estimates
Abstract Views :146 |
PDF Views:74
Authors
Affiliations
1 CSIR-Fourth Paradigm Institute (CSIR-4PI), Wind Tunnel Road, Bengaluru 560 037,, IN
2 Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201 002, IN
1 CSIR-Fourth Paradigm Institute (CSIR-4PI), Wind Tunnel Road, Bengaluru 560 037,, IN
2 Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201 002, IN