Tsunami Report(Page 21-40)

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Tide in cms400350300250200150100507:15021-12-04 23-12-04 25-12-04 27-12-04 29-12-04 31-12-04 3/1/2005 5/1/2005Time(Courtesy: NIOT, Chennai)FIG 15. Variation of Tide at Port Blair during Tsunami.NIOT’s ATG at Chennai has also recorded the first signal of tsunami in the form of“receding water” at 09:06 hrs at Chennai Port Trust followed by abnormality in tidelevel at 09:15 hrs on 26 th December 2004 (Fig.16). The tide gauge was overwhelmedby the sudden and abnormally high water level and harbour oscillations due to whichthe tide record showed a saturation at around 1.5 m. However, the lower rangesclearly show that the water level should have been much above 1.5 m. Thedifference between the time of occurrence of tsunami at Port Blair, Andaman andChennai is around 2 hrs and corresponds well with the distance between Chennaiand Port Blair and the speed of the tsunami wave.(Courtesy: NIOT, Chennai)FIG 16. Variation of Tide at Chennai Port Trust during Tsunami26
The Tide gauge data from major ports of India maintained by Survey of India hasbeen processed by National Institute of Oceanography which showed that thetsunami hit Chennai at 09:06 hrs, Machillipatanam, Visakhapatnam and Paradip, at09:05 hrs, Tuticorin at 09:57 hrs, along the east coast and on the west coast it hitKochi at 11:10 hrs and Mormugao at 12:25 hrs (Fig.17). The non-tidal oscillationscontinued at Visakhapatnam, Tuticorin, Kochi and Mormugao well after the mainevent took place. NIOT’s ATG at Kochi has also recorded first hit of tsunami at11:12 hrs coincided with that of Survey of India tide gauge.There were no reports of inundation of coastal areas due to tsunami in the northernAndhra Pradesh and Orissa as the water level rose by less than 0.5 m. However, theinland areas like Ports and Harbours, for example, Visakhapatnam Fishing Harbourand Port experienced amplification of tide due to coning effect from outer harbour toentrance channel and unusual current speed in the order of 5 to 10 m/s (Fig.18).These strong flood and ebb currents have forcefully pulled 15-20 fishing boats out ofharbour (Fig.19); during the course few boats encountered minor damage.Although Tuticorin is situated south of Rameswaram, Tamilnadu, it witnessedtsunami at 09:57 hrs, almost an hour later it hit Chennai coast. It is to notice thatwhen high energy tsunami waves traverse horizontally across Indian Ocean, the eastcoast of Sri Lanka has absorbed the devastating tsunami energy and the refractedwaves with low energy only reached its west coast and southern east coast ofTamilnadu, which is confirmed by the wave modelling studies (Figs. 13 & 14). Thusmost of the southern coastal belt of Tamilnadu, shadowed by Sri Lanka, were lessaffected. It is for this reason, the refracted tsunami waves took more time to reachTuticorin.27
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Page 3 and 4: Shallow focus earthquakes measuring
Page 5: Tsunami energyFIG 14. Simulation of
Page 9 and 10: FIG 18. Variation of Wave height an
Page 11 and 12: Subsequently a series of waves hit
Page 13 and 14: TABLE 3. Distribution of Bacterial
Page 15 and 16: 5.3.3 South of ChennaiFIG 24.The pr
Page 17 and 18: (Courtesy: NRSA)FIG 26. Satellite i
Page 19 and 20: Fishing HarbourAgricultural LandsBe

Tsunami Report(Page 21-40)

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