FIG. 11 Seismic Zones
FIG. 11 Seismic Zones is a map sheet from the Chennai Metropolitan Development Authority material that shows seismic zones in India, earthquake zones in Tamil Nadu, wind and cyclone zones in Tamil Nadu, and a Chennai Metropolitan Area cyclone prone area map. The source text says the cyclone prone area is measured as 20 kilometres from the coastal line, and it also marks district and area level risk categories that can matter for planning and property location decisions.
What this document is
FIG. 11 Seismic Zones is a map based guidance sheet used in Chennai Metropolitan Development Authority material. It brings together four map based references, a map of India showing seismic zones of India, Tamil Nadu earthquake zones, Tamil Nadu wind and cyclone zones, and a Chennai Metropolitan Area cyclone prone area map.
Who issued it
The source text names GIS Cell, Chennai Metropolitan Development Authority on the Chennai Metropolitan Area cyclone prone area map. The India seismic map also states that it is based upon a Survey of India outline map printed in 1993 and carries Government of India copyright, 2005.
What it covers
The map sheet is about natural hazard zoning, not ownership or title.
It shows:
- Seismic zones across India, labelled as Zone II, Zone III, Zone IV and Zone V.
- A note that towns falling at the boundary of zone demarcation line between two zones shall be considered in higher zone.
- Tamil Nadu earthquake zones, with areas marked as moderate damage and low damage.
- Tamil Nadu wind and cyclone zones, with areas marked as zone A and zone B, and wind speed labels shown on the map.
- A Chennai Metropolitan Area cyclone prone area, defined in the legend as 20 Kms measured from coastal line.
Why it may affect property buyers and owners
This map sheet can help a buyer, owner or professional understand whether land or buildings fall in a higher or lower natural hazard area.
That may matter for:
- site selection
- planning and design decisions
- checking whether a location is in a cyclone prone coastal belt
- understanding whether a boundary location is treated in the higher hazard zone
Key map details in the source text
- The Chennai Metropolitan Area map legend marks CMA boundary, city boundary, taluk boundary, village boundary, national highways, railway line, inner ring road, N.H. bye pass road and outer ring road.
- The Chennai Metropolitan Area map specifically highlights cyclone prone area within 20 kilometres from the coast.
- The source text includes standard map disclaimers about correctness of internal details, territorial waters, and some state boundaries not being verified.
What this document does not say
The source text does not give any rule, approval process, building standard, compensation, fee or property restriction linked to these zones. It is a hazard reference map showing where different risk zones are located.
This summary is generated from the source document to help you find what is relevant. The PDF above is authoritative. For advice on your own property, use LandLens One or speak to a qualified professional.
Common questions
Does this document show whether my area in Tamil Nadu is in an earthquake risk zone?
Yes. The source text includes a Tamil Nadu earthquake zones map and marks areas as moderate damage or low damage.
How is a town treated if it lies on the boundary between two seismic zones?
The source text says towns falling at the boundary of zone demarcation line between two zones shall be considered in the higher zone.
Does this document identify cyclone prone parts of the Chennai Metropolitan Area?
Yes. The Chennai Metropolitan Area map legend marks a cyclone prone area measured as 20 kilometres from the coastal line.
Does this document set any fees, approvals or legal restrictions on property?
The source text provided is a set of hazard maps and legends. It does not state any fee, approval procedure or legal restriction.
