In "The Deadliest Tsunami in History," the cause of the Indian Ocean tsunami was

the result of a massive undersea earthquake. Specifically, on December 26, 2004, a magnitude 9.1 earthquake occurred off the west coast of northern Sumatra in Indonesia. This earthquake was caused by the movement of the India plate sliding beneath the Burma plate, resulting in a rupture that released an enormous amount of energy. The energy released from the earthquake caused the ocean floor to uplift, displacing a massive amount of water and triggering the formation of a tsunami.

The cause of the Indian Ocean tsunami, also known as the deadliest tsunami in history, was a massive undersea earthquake. This earthquake occurred at a subduction zone where the Indian Plate is slowly sliding beneath the Burma Plate. The specific region affected was near the west coast of northern Sumatra, Indonesia. On December 26, 2004, a magnitude 9.1 earthquake struck under the ocean floor, resulting in the displacement of a huge amount of water. This displacement led to the formation of a series of enormous waves, or tsunamis, that radiated outward from the earthquake source and traveled across the Indian Ocean, causing devastation in multiple countries, including Indonesia, Sri Lanka, India, Thailand, and others.

To find out the cause of the Indian Ocean tsunami, you can start by researching the historical event. Here's how you can get the answer:

1. Start by gathering information about the Indian Ocean tsunami. Use trustworthy sources such as books, articles, or reputable websites. For this specific question, it might be helpful to search for articles or documentaries specifically about "The Deadliest Tsunami in History" or the "2004 Indian Ocean Tsunami."

2. Read or watch the information you find to gain a comprehensive understanding of the event. Look for expert analysis, eyewitness accounts, and scientific explanations that provide insight into the cause of the tsunami.

3. One of the key causes of the Indian Ocean tsunami was an undersea earthquake. The tsunami was triggered by a massive earthquake with a magnitude of 9.1–9.3 off the coast of northern Sumatra, Indonesia, on December 26, 2004. This earthquake was one of the strongest ever recorded, resulting from the convergence of the Indian-Australian tectonic plate and the Burma microplate.

4. The earthquake displaced a significant volume of water, causing a series of powerful tsunami waves to propagate across the Indian Ocean. These waves reached the coasts of many countries, resulting in widespread devastation and loss of life.

5. It is important to note that while the earthquake was the initial cause, other factors such as the topography of the affected areas and the lack of early warning systems also contributed to the severity of the disaster.

By following these steps, you should be able to find the answer to your question and gain a deeper understanding of the causes behind the Indian Ocean tsunami.