Influence of Source Distance on Site-Effects in Delhi City
IR@C-MMACS: CSIR-Centre for Mathematical Modelling and Computer Simulation, Bangalore
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Title |
Influence of Source Distance on
Site-Effects in Delhi City
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Creator |
Parvez, Imtiyaz A
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Subject |
Computational Seismology
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Description |
The seismic ground motion along a geological cross-section from Tilak Bridge to
Punjabi Bagh in Delhi city has been simulated at every 130 meters with a hybrid
technique (modal summation and finite differences). We use two earthquake source
scenarios: (1) August 27, 1960, M=6.0 at a distance of about 45 km (near source) and (2)
a large (M=8.0) earthquake due in the central seismic gap in the Himalayan region, at a
distance of about 225 km (far source). We focus on the influence of the seismic source
location and focal mechanism on site-response, which, in general, is neglected in
traditional site-effect studies. We compare the Response Spectra Ratio (RSR) for
frequency up to 3 Hz computed due to far and near sources. We observe 6-7 times higher
amplification in the radial component at around 2-2.5 Hz due to the far source as
compared to the near source. However, there is some amplification, of the order 2-3, at
lower frequencies (less than 1 Hz) due to the near source, which is missing when the far
source is considered. To validate our results, we compare the RSR, obtained from the
signals at soft sites, namely CPCB, IHC and CSIR, normalized to the bedrock Ridge site,
recorded during Chamoli earthquake of 1999, with the RSR at similar sites theoretically
computed along our 2-D geological cross-sections
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Publisher |
CSIR Centre for Mathematical Modelling and Computer Simulation
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Date |
2005-06
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Type |
Monograph
NonPeerReviewed |
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Format |
application/pdf
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Identifier |
http://cir.cmmacs.ernet.in/190/1/rrcm0507a.pdf
Parvez, Imtiyaz A (2005) Influence of Source Distance on Site-Effects in Delhi City. Technical Report. CSIR Centre for Mathematical Modelling and Computer Simulation, C-MMACS,Bangalore 560037,India. (Unpublished) |
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Relation |
http://cir.cmmacs.ernet.in/190/
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