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| Titel |
Estimation of peak ground acceleration and spectral acceleration for South India with local site effects: probabilistic approach |
| VerfasserIn |
K. S. Vipin, P. Anbazhagan, T. G. Sitharam |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 9, no. 3 ; Nr. 9, no. 3 (2009-06-16), S.865-878 |
| Datensatznummer |
250006794
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| Publikation (Nr.) |
 copernicus.org/nhess-9-865-2009.pdf |
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| Zusammenfassung |
| In this work an attempt has been made to evaluate the seismic hazard of South
India (8.0° N–20° N; 72° E–88° E) based on
the probabilistic seismic hazard analysis (PSHA). The earthquake data
obtained from different sources were declustered to remove the dependent
events. A total of 598 earthquakes of moment magnitude 4 and above were
obtained from the study area after declustering, and were considered for
further hazard analysis. The seismotectonic map of the study area was
prepared by considering the faults, lineaments and the shear zones in the
study area which are associated with earthquakes of magnitude 4 and above.
For assessing the seismic hazard, the study area was divided into small grids
of size 0.1°×0.1°, and the hazard parameters were
calculated at the centre of each of these grid cells by considering all the
seismic sources with in a radius of 300 km. Rock level peak horizontal
acceleration (PHA) and spectral acceleration (SA) values at 1 s
corresponding to 10% and 2% probability of exceedance in 50 years have
been calculated for all the grid points. The contour maps showing the spatial
variation of these values are presented here. Uniform hazard response
spectrum (UHRS) at rock level for 5% damping and 10% and 2% probability of
exceedance in 50 years were also developed for all the grid points. The peak
ground acceleration (PGA) at surface level was calculated for the entire
South India for four different site classes. These values can be used to find
the PGA values at any site in South India based on site class at that
location. Thus, this method can be viewed as a simplified method to evaluate
the PGA values at any site in the study area. |
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