Site-specific microzonation study in Delhi Metropolitan City by 2-D modelling of SH and P-SV waves
IR@C-MMACS: CSIR-Centre for Mathematical Modelling and Computer Simulation, Bangalore
View Archive Info| Field | Value | |
| Title |
Site-specific microzonation study in Delhi Metropolitan City by 2-D modelling of SH and P-SV waves
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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 modal summation and the finite difference scheme for sitespecific
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 modelling. The response
spectra ratio (RSR), ie 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 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 the vertical component is large at high frequency (> 4
Hz.) whereas it is negligible in lower frequency range.
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| Publisher |
CSIR Centre for Mathematical Modelling and Computer Simulation
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| Date |
2002-04
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| Type |
Monograph
NonPeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://cir.cmmacs.ernet.in/206/1/rrcm0203r.pdf
Parvez, Imtiyaz A (2002) Site-specific microzonation study in Delhi Metropolitan City by 2-D modelling of SH and P-SV waves. 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/206/
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