1. Some geophysical parameters as inputs for Tsunami surge models DR.K.S.R.Murthy National Institute of Oceanography, Regional Centre, Visakhapatnam. 530 017 Email: ksr@nio.orgksr@nio.org Paper presented at the International Workshop on “Tsunami and non-linear waves” held at the Saha Institute of Nuclear Physics, Kolkata, 6 th – 10 th March, 2006

4. COASTAL MORPHOLOGY COASTAL MORPHOLOGY ● General morphology of Eastern Continental Margin of India (ECMI) Impact of morphology on Tsunami Surge and Inundation – Case Study from Tamil Nadu Margin, East Coast of India Impact of morphology on Tsunami Surge and Inundation – Case Study from Tamil Nadu Margin, East Coast of India

8. Table 1 Shelf / Slope characteristics off selected places over the ECMI Location (See Fig. 1) Water depth at Shelf break (m) Shelf edge Distance from coast (km) Shelf gradient (ratio) Slope gradient (ratio) Depth at which marginal high (M.H.) is recorded (m) Remarks (only relative terms) Paradip10068 1 : 320 1 : 50 Not clear Wide shelf, gentle slope Puri 130 shelf, 56 1 : 300 1 : 43 Not clear Wide shelf, gentle slope Chilka Lake 22052 1 : 200 1 : 28 800? Wide shelf, gentle slope South of Chilka Lake 22047 1 : 200 1 : 35 Not clear Wide shelf, gentle slope South of Gopalpur 22051 1 : 200 1 : 16 1500 – 2000 Wide shelf, steep slope Kalingapatnam12044 1 : 280 1 : 16 1800 – 2000 Narrow shelf, steep slope South of Kalingapatnam 13053 1 : 345 1 : 15 2000 – 2100 Wide shelf, steep slope Visakhapatnam20054 1 : 250 1 : 12 1900 – 2100 Wide shelf, steep slope North of Kakinada 20057 1 : 225 1 : 12 2400 – 2600 Wide shelf, steep slope Krishna river 7035 1 : 300 1 : 25 Uncertain due to slumping over the slope Narrow shelf, gentle slope Nizampatnam7057 1 : 300 1 : 25 Uncertain due to slumping over the slope Wide shelf, gentle slope Madras20055 1 : 200 1 : 8 2700 Wide shelf, very steep slope North of Pondicherry 9051 1 : 400 1 : 6 3000 Wider shelf, very steep slope Karaikal7029 1 : 200 1 : 19 3000 Narrow shelf, steep slope Nagapatnam7047 1 : 340 1 : 17 3000 Narrow shelf, steep slope

12. Bathymetry sections of Cauvery basin (for locations please see Fig. 5a)

15. COASTAL SEISMICITY COASTAL SEISMICITY Low to Moderate Seismicity from coastal regions- Case Studies from East Coast of India Low to Moderate Seismicity from coastal regions- Case Studies from East Coast of India

16. NATURAL HAZARDS IN THE INDIAN SUB-CONTINENT NATURAL HAZARDS IN THE INDIAN SUB-CONTINENT Peninsular India is often faced with two major natural hazards namely the cyclone and storm surges in the coastal areas and the intraplate seismicity in the main land and coastal areas. Peninsular India is often faced with two major natural hazards namely the cyclone and storm surges in the coastal areas and the intraplate seismicity in the main land and coastal areas. We have now fairly a well established weather forecasting mechanism to cope up with high cyclone and storm surges. We have now fairly a well established weather forecasting mechanism to cope up with high cyclone and storm surges. The other natural hazards is the continental earthquakes like the Latur (1993), Jabalpur (1997), Bhuj (2001) which caused huge devastation, including heavy human losses. These earthquakes are the result of the reactivation of subsurface weak zones beneath the continental shield. The reactivation is due to compressional stress accumulated on the Indian Plate as it moves northward in the overall plate Kinematics of this part of the earth. The other natural hazards is the continental earthquakes like the Latur (1993), Jabalpur (1997), Bhuj (2001) which caused huge devastation, including heavy human losses. These earthquakes are the result of the reactivation of subsurface weak zones beneath the continental shield. The reactivation is due to compressional stress accumulated on the Indian Plate as it moves northward in the overall plate Kinematics of this part of the earth.

17. Fig. 7