Role of attenuation relationship in shaping the seismic hazard |
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| Authors: | K Mohan A Joshi |
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| Institution: | (1) Institute of Seismological Research, Raisan, Gandhinagar, Gujarat, 382009, India;(2) Department of Earth Science, Indian Institute of Technology, Roorkee, 247667, India |
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| Abstract: | Attenuation relationships are commonly used for engineering studies to estimate the peak ground acceleration values. This
paper presents the role of attenuation relationship in defining the seismic hazard in an area. It is seen that the seismic
hazard in an area, which is calculated using attenuation relationships, is mostly controlled by the type of attenuation relationship
used in the study. The present work aims to study the effect of attenuation relationship on seismic hazard study. In the present
work, seismic hazard maps have been prepared in the seismically very active northeast Himalaya using the approach given by
Joshi and Patel (Tectonophysics 283:289–310, 1997). The attenuation relationships of Jain et al. (2000), Sharma (2000), Joyner and Boore (Bull Seism Soc Am 71:2011–2038, 1981) and Abrahamson and Litehiser (Bull Seism Soc Am 79:549–580, 1989) have been considered in the present study. Among all considered attenuation relationships, the Abrahamson and Litehiser
(Bull Seism Soc Am 79:549–580, 1989) attenuation relationship gives the least root mean square error between the recorded and calculated peak ground acceleration
values. Therefore, the same has been used to define attenuation characteristic of the region. The mean and standard deviation
of peak ground acceleration values at all the observation points due to above-mentioned attenuation relationships in the NE
Himalayas are calculated. The study shows that the Zone III covers an area of 81,000 km2 and Zone II of 96,000 km2 in the map prepared using the mean peak ground acceleration values, whereas the area of Zone IV increases by 40,000 km2 when the map is prepared by adding the standard deviation values in the mean peak ground acceleration values, and only Zone
II is left with 183,000 km2 when the standard deviation values are subtracted from the mean. This high standard deviation is due to the difference in
the peak ground acceleration values obtained from different events. This study shows that a rigorous test needs to be done
for selecting attenuation relationship for any hazard study in a given area. |
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