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| Titel |
First level seismic microzonation map of Chennai city – a GIS approach |
| VerfasserIn |
G. P. Ganapathy |
| 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 ; 11, no. 2 ; Nr. 11, no. 2 (2011-02-21), S.549-559 |
| Datensatznummer |
250009167
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| Publikation (Nr.) |
 copernicus.org/nhess-11-549-2011.pdf |
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| Zusammenfassung |
| Chennai city is the fourth largest metropolis in India, is the focus
of economic, social and cultural development and it is the capital
of the State of Tamil Nadu. The city has a multi-dimensional growth
in development of its infrastructures and population. The area of
Chennai has experienced moderate earthquakes in the historical past.
Also the Bureau of Indian Standard upgraded the seismic status of
Chennai from Low Seismic Hazard (Zone II) to Moderate Seismic Hazard
(Zone III)–(BIS: 1893 (2001)). In this connection, a first level
seismic microzonation map of Chennai city has been produced with a
GIS platform using the themes, viz, Peak Ground Acceleration (PGA),
Shear wave velocity at 3 m, Geology, Ground water fluctuation and
bed rock depth. The near potential seismic sources were identified
from the remote-sensing study and seismo-tectonic details from
published literatures. The peak ground acceleration for these
seismic sources were estimated based on the attenuation relationship
and the maximum PGA for Chennai is 0.176 g. The groundwater
fluctuation of the city varies from 0–4 m below ground level. The
depth to bedrock configuration shows trough and ridges in the
bedrock topography all over the city. The seismic microzonation
analysis involved grid datasets (the discrete datasets from
different themes were converted to grids) to compute the final
seismic hazard grid through integration and weightage analysis of
the source themes. The Chennai city has been classified into three
broad zones, viz, High, Moderate and Low Seismic Hazard. The High
seismic Hazard concentrated in a few places in the western central
part of the city. The moderate hazard areas are oriented in NW-SE
direction in the Western part. The southern and eastern part will
have low seismic hazard. The result of the study may be used as
first-hand information in selecting the appropriate earthquake
resistant features in designing the forthcoming new buildings
against seismic ground motion of the city. |
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