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Table 9 Depth to Bedrock in Greater Chennai

From: GIS based urban social vulnerability assessment for liquefaction susceptible areas: a case study for greater Chennai, India

No

Zone

Nature

Bedrock depth

Composition

1

North

Coastal alluvium followed by Gondwana clay

28–90

Recent alluvium Sand-silt, Shale, Sedimentary rocks

2

South

Crystalline rocks with top soil cover

25

Silt–clay, Charnockites, Weathered rocks

3

West

Alluvium followed by Gondwana clay, Shales, Crystalline rocks

24–90

Mixed alluvium Clay Shales, Sand stones

4

Central

River alluvium followed by Crystalline rock

30

Alluvium Silt–clay, Gondwana shales

5

East

Coastal alluvium followed by Crystalline rock

5–30

Sand / Silt, Sand dunes, Marine fluvial clay Crystalline rocks