Research Article

Earthquake Recurrence and Rupture Dynamics of Himalayan Frontal Thrust, India

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Science  14 Dec 2001:
Vol. 294, Issue 5550, pp. 2328-2331
DOI: 10.1126/science.1066195

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The Black Mango fault is a structural discontinuity that transforms motion between two segments of the active Himalayan Frontal Thrust (HFT) in northwestern India. The Black Mango fault displays evidence of two large surface rupture earthquakes during the past 650 years, subsequent to 1294 A.D. and 1423 A.D., and possibly another rupture at about 260 A.D. Displacement during the last two earthquakes was at minimum 4.6 meters and 2.4 to 4.0 meters, respectively, and possibly larger for the 260 A.D. event. Abandoned terraces of the adjacent Markanda River record uplift due to slip on the underlying HFT of 4.8 ± 0.9 millimeters per year or greater since the mid-Holocene. The uplift rate is equivalent to rates of fault slip and crustal shortening of 9.6−3.5 +7.0 millimeters per year and 8.4−3.6 +7.3 millimeters per year, respectively, when it is assumed that the HFT dips 30° ± 10°.

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