The eastern coastal part of the Indian Ocean is seismically active.

The eastern coastal part of the Indian Ocean is seismically active because-

1. The Andaman Sea is seismically active; it is a part of the Indian Ocean. 

2. The Andaman sea is a part of the Indian Ocean. It is seismically active. 

3. It is one of the most active plate margins in the world that generates frequent earthquakes. 

4. Most of the islands in the eastern part of the Arabian Sea are volcanic islands because they are associated with the converging plate boundary. These islands are peaks of submerged mountains.

5. The Krakatau volcanic eruption has caused large tsunamis in the past. 

6. Tsunamis have been generated due to earthquakes / volcanic eruption in the Indian region.