Stochastic ground-motion simulation of two Himalayan earthquakes: seismic hazard assessment perspective |
| |
| Authors: | Ashish Harbindu Mukat Lal Sharma Kamal |
| |
| Institution: | (1) Department of Earthquake Engineering, Indian Institute of Technology, Roorkee, India;(2) Department of Earth Sciences, Indian Institute of Technology, Roorkee, India |
| |
| Abstract: | The earthquakes in Uttarkashi (October 20, 1991, M
w 6.8) and Chamoli (March 8, 1999, M
w 6.4) are among the recent well-documented earthquakes that occurred in the Garhwal region of India and that caused extensive
damage as well as loss of life. Using strong-motion data of these two earthquakes, we estimate their source, path, and site
parameters. The quality factor (Q
β
) as a function of frequency is derived as Q
β
(f) = 140f
1.018. The site amplification functions are evaluated using the horizontal-to-vertical spectral ratio technique. The ground motions
of the Uttarkashi and Chamoli earthquakes are simulated using the stochastic method of Boore (Bull Seismol Soc Am 73:1865–1894,
1983). The estimated source, path, and site parameters are used as input for the simulation. The simulated time histories are
generated for a few stations and compared with the observed data. The simulated response spectra at 5% damping are in fair
agreement with the observed response spectra for most of the stations over a wide range of frequencies. Residual trends closely
match the observed and simulated response spectra. The synthetic data are in rough agreement with the ground-motion attenuation
equation available for the Himalayas (Sharma, Bull Seismol Soc Am 98:1063–1069, 1998). |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
