Question

The Indian ocean tsunami(2004) -Areas affected: part of southern and Andaman nicobar islands

Answer 1

Answer:

Explanation:

Four years after the Indian Ocean tsunami, fresh data emerging from geological calculations have suggested that the killer seaquake did not actually displace the Andaman and Nicobar islands by over a meter as earlier reported but by just around seven centimeter.

New data collated by a group of Indian geologists1 overrides earlier calculations of the Survey of India posing another significant question: is there a need to make a fresh assessment of the magnitude of the 2004 seaquake? The finding means all data pertaining to the magnitude and displacement in government records will have to be refreshed.

Soon after the tsunami, the Survey of India (SOI) had estimated that Port Blair, the capital of Andaman and Nicobar islands, had shifted by over one meter. The team of surveyors compiled scientific readings from across the Andaman and Nicobar islands to discover that its Port Blair control point had shifted towards the south-eastern side by 1.15 meter from its earlier position.

The sea had recorded a not-so-significant drop of 25 cm from its earlier level at the Port Blair control point, which led the team to infer that there could be some subsidence also. The mean sea level had also increased by 1.5 m post-tsunami. The seven-member team of the survey body studying the latitude, longitude and height at 20 of its control points in the islands released this data at an international conference on disaster management in 2005.

However, a joint study by geologists of the National Geophysical Research Institute (NGRI), Hyderabad, Centre for Mathematical Modelling and Computer Simulation, Bangalore, National Centre for Antarctic and Ocean Research, Goa and the India Meteorological Department, Port Blair says the movement was between seven and 12 centimeter.