International Journal of Earth Sciences

, Volume 99, Supplement 1, pp 265–278 | Cite as

Magnetic fabrics indicating Late Quaternary seismicity in the Himalayan foothills

  • R. Jayangondaperumal
  • Ashok Kumar Dubey
  • B. Senthil Kumar
  • S. G. Wesnousky
  • S. J. Sangode
Original Paper

Abstract

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 Kmin 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 earthquake-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 (Kmin) 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.

Keywords

Anisotropy of magnetic susceptibility (AMS) Earthquake fabric Himalaya Paleoseismicity 

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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • R. Jayangondaperumal
    • 1
  • Ashok Kumar Dubey
    • 1
  • B. Senthil Kumar
    • 2
  • S. G. Wesnousky
    • 3
  • S. J. Sangode
    • 4
  1. 1.Wadia Institute of Himalayan GeologyDehradunIndia
  2. 2.Indian Institute of SciencesBangaloreIndia
  3. 3.Center for Neotectonic StudiesUniversity of NevadaRenoUSA
  4. 4.Department of GeologyUniversity of PunePuneIndia

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