GEOLOGY

Detailed explanation-1: -The largest number of earthquakes occur around the rim of the Pacific Ocean associated with a series of volcanoes and deep-ocean trenches known as the “Ring of Fire". As a result, the largest source region for tsunamis is in the Pacific Ocean with 71% of all occurrences.

Detailed explanation-2: -Scientists estimate that almost three quarter of the world tsunamis occur in the Pacific Ocean, where the megathrusts (subduction zones) are so common (Aleutian Islands, Alaska, Chile, Philippines, Japan etc).

Detailed explanation-3: -The reason is that the Pacific covers more than one-third of the earth’s surface and is surrounded by a series of mountain chains, deep-ocean trenches and island arcs called the “ring of fire”-where most earthquakes occur (off the coasts of Kamchatka, Japan, the Kuril Islands, Alaska and South America).

Detailed explanation-4: -Of the 754 confirmed events in the Global Historical Tsunami Database between 1900 and 2015, about 78% occurred in the Pacific Ocean (around the geologically active “Ring of Fire”), 8% in the Atlantic Ocean and Caribbean Sea, 6% in the Mediterranean Sea, 5% in the Indian Ocean, and 1% in other seas.

Detailed explanation-5: -The Pacific Ocean and its adjacent marginal seas are the largest, most diverse, and most tsunami-prone of any of the earth’s oceans. Pacific Ocean nations face and must be prepared for distant, and local tsunami threats.