Recorded history in that part of the world happens to be about 200 years old, or, about 1/20 millionth of the history of the earth.
Nothing like the Sumatran Tsunami in that portion of the Indian Ocean had happened in "recorded history" and Mt. St. Helens had never had a massive landslide and lateral blast "in recorded history."
That's the problem with geologic risk assessment; people have difficulty seeing beyond the microscopic span of their lifetimes. Anything they haven't personally witnessed doesn't seem real.
>>>Recorded history in that part of the world happens to be about 200 years old, or, about 1/20 millionth of the history of the earth.>>>
My point is that we could go around the world and spot many many things that COULD pose a problem.