One of the worst tsunamis to form occurred after a(n) in indonesia.

a: earthquake

b: volcanic eruption

c: landslide

d: hurricane

One of the worst tsunamis to form occurred after a 9.1-9.3 magnitude megathrust earthquake that was caused by the rupture along the fault along the Berma Plate and the Indian Plate. The resulting tsunami had waves up to 30 meters (100 ft.)