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Title: Seismic anisotropy beneath the Kumaun-Garhwal Himalaya using core-refracted shear wave phases
Authors: Kumar, V. Pavan
Gupta, Sandeep
Borah, Kajaljyoti
Prakasam, K. S.
Dept. of Earth and Climate Science
Keywords: Structure of the Earth
Seismic anisotropy
Continental margins
Issue Date: Jun-2022
Publisher: Oxford University Press
Citation: Geophysical Journal International, 229(3), 1978–1989.
Abstract: We investigate the nature of seismic anisotropy in the Kumaun–Garhwal Himalaya by analysing the core-refracted shear wave splitting phases (SK(K)S, PKS) recorded at 42 broad-band seismic stations. The mean fast anisotropy directions are mostly in ∼E–W and a few in the ∼NE–SW directions. The mean delay time decreases progressively from ∼1.0 s beneath the Sub Himalaya to ∼0.5 s at the Higher Himalaya. The observed seismic anisotropy suggests that the ongoing deformation beneath the Kumaun–Garhwal Himalaya has a large contribution by the relative rotation of the asthenospheric flow by the compression along the Indian Plate motion direction in this collision zone. Also, the southward transportation of the mid-crustal flow is probably responsible for the reduction in the delay times in the Main Central Thrust zone and further north than in the Sub-to-Lower Himalaya. The splitting parameters indicate a complex pattern of deformation beneath the Kumaun–Garhwal Himalaya with contribution from crust, lithospheric mantle and asthenospheric mantle.
ISSN: 1365-246X
Appears in Collections:JOURNAL ARTICLES

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