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Mundepi, A. K.
- Estimation of Site Amplification at Various Litho-Units in NW-Himalaya Using Horizontal to Vertical Ratio
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1 Wadia Institute of Himalayan Geology, 33, General Mahadeo Singh Road, Dehra Dun - 248 001, IN
2 Kumaun University, Nainital - 263 002, IN
1 Wadia Institute of Himalayan Geology, 33, General Mahadeo Singh Road, Dehra Dun - 248 001, IN
2 Kumaun University, Nainital - 263 002, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 70, No 4 (2007), Pagination: 605-609Abstract
This note is a result of an off-shoot study carried out of a reconnaissance Seismic noise survey to establish broadband seismological stations. The survey was conducted in Kumaun Himalaya for the purpose of characterizing background seismic noise characteristics. This paper deals with the estimation of local site effects at various locations with varying geological and tectonic environments in the region. The effects of the various litho units on the site's predominant frequency are depicted here it is seen that the character of the top sedimentary column and its compaction plays a vital role in the estimation of site response. The level of tectonic complexity is also reflected in the noise spectra of the studied regions. The region in close proximity of the MCT zone exhibits high background seismic noise level.Keywords
Seismic Noise, Site Amplification, Lithological Effect, Kumaun Himalaya.
- Soft Soil Mapping using Horizontal to Vertical Spectral Ratio (HVSR) for Seismic Hazard Assessment of Chandigarh City in Himalayan Foothills, North India
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Authors
Affiliations
1 Wadia Institute of Himalayan Geology, 33, G.M.S. Road, Dehradun - 248 001, IN
2 NORSAR, P. O. Box 53, NO-2027 Kjeller, NO
3 Department of Earth Sciences, Indian Institute of Technology, Roorkee - 247 667, IN
1 Wadia Institute of Himalayan Geology, 33, G.M.S. Road, Dehradun - 248 001, IN
2 NORSAR, P. O. Box 53, NO-2027 Kjeller, NO
3 Department of Earth Sciences, Indian Institute of Technology, Roorkee - 247 667, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 74, No 5 (2009), Pagination: 551-558Abstract
The populated and expanding city of Chandigarh is located in the foothills of Himalaya, near the potentially active Main Frontal Thrust (MFT). A hazard assessment for this city is consequently of major importance. Thick sediments underlies the city and that can potentially amplify the earthquake shaking and contribute to an earthquake disaster in the city. The present study applies the Horizontal to Vertical Spectral Ratio (HVSR) ambient noise methodology to estimate the resonance frequency of the soft sediments and to obtain a first order estimate of sediment thickness.
The study indicates that the soil thickness range from 30 to 270 m and that the resonance frequencies vary from 0.236 to 1.479 Hz. A smooth correlation function between soil thickness and resonance frequency is found, indicating relatively homogeneous soil.
Keywords
Site Response, H/V Ratio, Seismic Microzonation, Chandigarh, Himalaya.References
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- Site Response Evolution and Sediment Mapping Using Horizontal to Vertical Spectral Ratios (HVSR) of Ground Ambient Noise in Jammu City, NW India
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Authors
Affiliations
1 Wadia Institute of Himalayan Geology, 33, General Mahadeo Singh Road, Dehradun, IN
1 Wadia Institute of Himalayan Geology, 33, General Mahadeo Singh Road, Dehradun, IN