Publikationsdatum:
2014-02-27
Beschreibung:
[1] Episodic GPS measurements are used to quantify the present-day velocity field in the northwestern Himalaya from the southern Pamir to the Himalayan foreland. We report large postseismic displacements following the 2005 Kashmir earthquake and several mm/year thrusting of the central segment of the Salt Ranges and Potwar plateau over the foreland, westward thrusting of Nanga Parbat above the Kohistan plateau, and ~ 12 mm/yr SSE velocities of the Karakorum Ranges and of the Deosai and Kohistan plateaus relative to the Indian plate. Numerical simulations allow to determine a first approximation of slip along active faults : (1) substantial creep of ~87 mm/year between 2006 and 2012 along the flat northeast of the Balakot-Bagh thrust affected by the 2005 earthquake; (2) ~ 5 mm/year slip of the central segment of the Salt Ranges and Potwar plateau whereas their western boundaries are clearly inactive over the time span covered by our measurements; (3) 13 mm/year ductile slip along the MHT modeled by a dislocation dipping 7° northward, locked at a depth of 15 km; and (4) ~20 mm/year slip along the shear zone forming the western boundary of Nanga Parbat, between depths of 1.6 and 6.5 km. Residuals velocities suggest the existence of left-lateral strike-slip along the Jhelum fault.
Print ISSN:
0148-0227
Thema:
Geologie und Paläontologie
,
Physik
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