Minimum norm inversion of observed ground elevation changes for slips on the causative fault during the 1905 Kangra earthquake |
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Authors: | V K Gahalaut P K Gupta R Chander V K Gaur |
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Institution: | (1) Department of Earth Sciences, University of Roorkee, 247 667 Roorkee, India;(2) C-MMACS, National Aerospace Laboratories, Bangalore, India |
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Abstract: | We estimate the distribution of slip in the dip section of the causative fault for the 1905 Kangra earthquake by applying
the minimum norm inversion technique to differences in pre- and post-earthquake levelling data collected along the Saharanpur-Dehradun-Mussoorie
highway. For this purpose it is assumed that the causative fault of the 1905 Kangra earthquake was planar with a dip of 5°
in the northeast direction and that it had a depth of 6 km at the southern limit of the Outer Himalaya in Dehradun region.
The reliably estimated maximum slip on the fault is 7.5 m under the local northern limit of the Outer Himalaya. Using the
inverted slip distribution we estimate that the maximum permanent horizontal and vertical displacements at the surface due
to the Kangra earthquake were about 4 m and 1.5m respectively. The maximum transient displacements at the surface should have
exceeded these permanent displacements. These estimates of maximum slip on the causative fault and the resultant maximum permanent
and transient displacements at the surface during the Kangra earthquake may be taken tentatively as being representative of
the great Himalayan earthquakes. |
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Keywords: | Great earthquakes Dehradun fault slip inversion ground elevation change |
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