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| Titel |
Seismic vulnerability and risk assessment of Kolkata City, India |
| VerfasserIn |
S. K. Nath, M. D. Adhikari, N. Devaraj, S. K. Maiti |
| 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 Sciences ; 15, no. 6 ; Nr. 15, no. 6 (2015-06-02), S.1103-1121 |
| Datensatznummer |
250119524
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| Publikation (Nr.) |
 copernicus.org/nhess-15-1103-2015.pdf |
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| Zusammenfassung |
| The city of Kolkata is one of the most urbanized and densely populated
regions in the world and a major industrial and commercial hub of the
eastern and northeastern region of India. In order to classify the seismic
risk zones of Kolkata we used seismic hazard exposures on the vulnerability
components, namely land use/land cover, population density, building typology,
age and height. We microzoned seismic hazard of the city by integrating
seismological, geological and geotechnical themes in GIS, which in turn are
integrated with the vulnerability components in a logic-tree framework for
the estimation of both the socioeconomic and structural risk of the city. In
both the risk maps, three broad zones have been demarcated as "severe",
"high" and "moderate". There had also been a risk-free zone in the city
that is termed as "low". The damage distribution in the city due to the
1934 Bihar–Nepal earthquake of Mw = 8.1 matches satisfactorily
well with the demarcated risk regime. The design horizontal seismic
coefficients for the city have been worked out for all the fundamental
periods that indicate suitability for "A", "B" and "C" type of
structures. The cumulative damage probabilities in terms of "none",
"slight", "moderate", "extensive" and "complete" have also been
assessed for the predominantly four model building types viz. RM2L, RM2M,
URML and URMM for each seismic structural risk zone in the city. Both the
seismic hazard and risk maps are expected to play vital roles in the
earthquake-inflicted disaster mitigation and management of the city of
Kolkata. |
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