Enayam Port

Tamil Research Institute
RAPID TECHNO-ECONOMIC FEASIBILITY REPORT FOR
DEVELOPMENT OF COLACHEL PORT AT TAMILNADU
FINAL REPORT
7.4.3. Description of the site
This site is located to the northwest of the coastal belt. The basement consists of garnetiferous biotite gneiss. The
general trend of the strike in this area is N-NW to S-SE.
Some rocky islets are observed around 500 meters away from the coastline. Besides, weathered rock has been
identified close to the surface below laterite and beach sands.
These signs seem to indicate that the rock basement is relatively close to the surface and onshore soil thickness is
small, although 3.5 kilometres to the northwest, the Tambraparna River flows towards the Indic Ocean, and the
long-shore drift transports sands to the Enayam location.
7.4.4. Seismic hazard
Figure 112: Rocky islets near the beach (left) and weathered rock below the laterite soils (right).
The proposed project falls under Seismic Zone III, according to the classification proposed at IS 1893 (Part I):
Criteria for earthquake resistant design of structures. The zone factor Z which corresponds to Zone III is 0.16.
Figure 113: Seismic zone map. Source: Geological Survey of India (GSI).
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