Jayangondaperumal, R and Dubey, Ashok Kumar and Kumar, Senthil B and Wesnousky, SG and Sangode, SJ (2010) Magnetic fabrics indicating Late Quaternary seismicity in the Himalayan foothills. In: International Journal of Earth Sciences (Geologische Rundschau), 99 (Sp. Is). S265-S278.
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The anisotropy of magnetic susceptibility (AMS) study was performed on soft sediment samples from a trenched fault zone across the Himalayan frontal thrust (HFT), western Himalaya. AMS orientation of K-min axes in the trench sediments is consistent with lateral shortening revealed by geometry of deformed regional structures and recent earthquakes. Well-defined vertical magnetic foliation parallel to the flexure cleavage in which a vertical magnetic lineation is developed, high anisotropy, and triaxial ellipsoids suggest large overprinting of earth-quake- related fabrics. The AMS data suggest a gradual variation from layer parallel shortening (LPS) at a distance from the fault trace to a simple shear fabric close to the fault trace. An abrupt change in the shortening direction (K-min) from NE-SW to E-W suggests a juxtaposition of pre-existing layer parallel shortening fabric, and bending-related flexure associated with an earthquake. Hence the orientation pattern of magnetic susceptibility axes helps in identifying co-seismic structures in Late Holocene surface sediments.
|Item Type:||Journal Article|
|Additional Information:||Copyright of this article belongs to Springer .|
|Keywords:||Anisotropy of magnetic susceptibility (AMS); Earthquake fabric; Himalaya; Paleoseismicity|
|Date Deposited:||08 Nov 2010 08:54|
|Last Modified:||08 Nov 2010 08:54|
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