Microzonation and Site Specific Ground Motion Modelling of Delhi City
IR@C-MMACS: CSIR-Centre for Mathematical Modelling and Computer Simulation, Bangalore
View Archive Info| Field | Value | |
| Title |
Microzonation and Site Specific Ground Motion Modelling of Delhi City
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| Creator |
Parvez, Imtiyaz A
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| Subject |
Computational Seismology
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| Description |
Delhi - the capital of India - lies on a severe earthquake hazard threats not only from the local earthquakes but also from Himalayan events just 200-250 km apart. The seismic ground motion in a part of Delhi City is computed with a hybrid technique based on the based on the modal summation and the finite difference scheme for site-specific strong ground motion modelling. Complete realistic SH and P-SV wave seismograms are computed along two geological cross-sections, (1) North_South, from Inter State Bus Terminal (ISBT) to Sewanagar and (2) East-West, from Tilak Bridge to Punjabi Bagh. Two real earthquake sources of July 15, 1720 (MMI=IX, M=7.4) and August 27, 1960 (M=6.0) have been used in the modelling. The response spectra ratio (RSR), i.e. the response spectra computed from the signals synthesized along the laterally varying section normalized by the response spectra computed from the corresponding signals, synthesized for the bedrock reference regional model, have been determined. As expected, the sedimentary cover causes an increase of the signal amplitude particularly in the radial and transverse components. To further check the site-effects, we reversed the source location to the other side of the cross-section and re-computed the site amplifications. There are only a few sites where a large amplification is invariant with respect to the two source locations considered. The RSR ranges between 5 to 10 in the frequency range from 2.8 to 3.7 Hz, for the radial and transverse components of motion along the NS cross-section. Along the EW cross-section RSR varies between 3.5 to 7.5 in the frequency range from 3.5 to 4.1 Hz. The amplification of vertical component is large at high frequency (.4Hz) whereas it is negligible in lower frequency range.
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| Publisher |
The Abdus Salam International Centre for Theoretical Physics, Italy
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| Date |
2002-11
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| Type |
Monograph
NonPeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://cir.cmmacs.ernet.in/264/1/IC%202002%20145.pdf
Parvez, Imtiyaz A (2002) Microzonation and Site Specific Ground Motion Modelling of Delhi City. Project Report. The Abdus Salam International Centre for Theoretical Physics, Italy, The Abdus Salam International Centre for Theoretical Physics. (Unpublished) |
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| Relation |
http://cir.cmmacs.ernet.in/264/
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