The correct option is (c) 2 and 3 only.
Explanation
Tsunamis are large ocean waves caused by the sudden displacement of water, usually resulting from underwater earthquakes, volcanic eruptions, or landslides. Early warning systems rely on seismic sensors and ocean buoys to detect these disturbances and alert coastal areas.
Statement-wise Analysis:
- Statement 1 is Incorrect: At the time of the December 2004 Tsunami, there was no operational early warning system in the Indian Ocean. While such systems existed in the Pacific Ocean, the lack of a detection and alert mechanism in the Indian Ocean contributed significantly to the high casualty count across the region.
- Statement 2 is Correct: Modern Tsunami Warning Systems (such as the DART system) combine seismic data with ocean pressure sensors. Since seismic waves travel much faster than tsunami waves, and tsunamis travel at approximately 800 km/h in deep water, it is possible to provide a notice of three hours or more for distant tsunamis (teletsunamis) originating far from the coast.
- Statement 3 is Correct: Tsunamis are significantly more frequent in the Pacific Ocean than in the Indian Ocean. This is because the Pacific Ocean is surrounded by the "Ring of Fire," a seismically active belt where tectonic plate subductions frequently generate major earthquakes and volcanic activity.
Key Takeaway:
The Indian Ocean Tsunami Warning System was established only after the 2004 disaster. The Pacific Ocean is the most tsunami-prone region globally due to the Pacific Ring of Fire.