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 threat not only from 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 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 ¼ IX, M ¼ 7:4) and August 27, 1960 (M ¼ 6:0) have been used in
modelling. The response spectra ratio (RSR), i.e. the response spectra computed from the signals
synthesized along the laterally varying section and 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 recomputed 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 the vertical component is considerable at high frequency (>4 Hz.)
whereas it is negligible in lower frequency range.
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| Publisher |
Springer
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| Date |
2004
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://cir.cmmacs.ernet.in/41/1/pageoph%2D2004.pdf
Parvez, Imtiyaz A (2004) Site-specific Microzonation Study in Delhi Metropolitan City by 2-D Modelling of SH and P-SV Waves. Pure Applied Geophysics, 161 (5-6). pp. 1165-1184. ISSN ISSN: 0033-4553 (print version) |
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| Relation |
http://www.springerlink.com
http://cir.cmmacs.ernet.in/41/ |
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