GPS measurements of postseismic deformation due to October 8, 2005 Kashmir earthquake |
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Authors: | C D Reddy Sanjay K Prajapati |
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Institution: | (1) Indian Institute of Geomagnetism, New Bombay, 410218, India |
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Abstract: | Relaxation of the coseismic stresses following an earthquake causes postseismic crustal deformation, which can last for days
to years. Continuous monitoring of postseismic deformation facilitates the understanding of the mechanism of deformation and
postseismic relaxation and viscous rheology. After the October 8, 2005 Kashmir earthquake, global positioning system data
for 8 months, starting from October, 2005 have been analyzed from three continuous sites located at Gulmarg, Amritsar, and
Jaipur. The average velocity during the observation period at Gulmarg (8.6 cm/year) is significantly higher than the Indian
plate velocity exhibiting postseismic crustal deformation. The velocity at Amritsar (5.9 cm/year) and Jaipur (5.1 cm/year)
is comparable to the Indian plate velocity. At Gulmarg, the logarithmic function fits well to the north–south component of
postseismic transients (~in the coseismic slip direction). The nature of decay in these transients suggests that the deformation
is mainly due to an afterslip, and the second possible contribution may be from the viscous relaxation process. This paper
presents the characteristics of postseismic transients and possible contributions from various postseismic mechanisms subsequent
to the Kashmir earthquake. |
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Keywords: | GPS Postseismic deformation Afterslip Logarithmic decay |
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