Affiliation:
1. Department of Civil Engineering, Indian Institute of Technology Guwahati, Guwahati, Assam, India
Abstract
In this study, one dimensional equivalent–linear ground response analyses were performed for some typical sites in the Guwahati city, India. Six bore locations covering about 250 km2 area of the city were considered for the analyses. As the strong motion significantly influences the ground response, seven different recorded ground motions, varying in magnitude (6.1 to 8.1) and other ground motion parameters, were adopted. Seismic site analyses were carried out for all layers of borelogs using all the seven earthquakes. Results are presented in terms of surface acceleration histories, strain and shear stress ratio variation, response spectrum, Fourier amplitude ratio versus frequency. The results indicate that accelerations were amplified the most at the surface level. The range of peak ground acceleration (PGA) values obtained at the ground surface is about 0.2 g to 0.79 for a range of PGA considered at bedrock level (rigid half space at bottom of borelog) of 0.1 g to 0.34 g. The Fourier amplifications of ground motion at surface are in the range of 4.14 – 8.99 for a frequency band of 1.75 Hz to 3.13 Hz. The maximum spectral acceleration at six locations varies in the range of 1.0 g – 4.71 g for all the seven earthquakes. The study clearly demonstrated the role for site effect and the type of ground motion on the ground response. For a given earthquake motion, amplification factors at surface level change by almost about 20% to 70% depending on local site conditions.
Subject
Geotechnical Engineering and Engineering Geology
Reference36 articles.
1. Reevaluated Intensities for the Great Assam Earthquake of 12 June 1897, Shillong, India
2. Review of correlations between SPT N and shear modulus: A new correlation applicable to any region
3. Census (2011). Retrieved January 8, 2013, from www.census2011.co.in/census/city/191-guwahati.html
4. DST. (2007). Seismic microzonation atlas of Guwahati region. Department of Science and Technology. Retrieved fromhttp://www.amtron.in/microzonation/
5. Probabilistic earthquake expectancy in the northeast Indian region.;H. C.Goswami;Bulletin of the Seismological Society of America,1982
Cited by
34 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献