If you find coral deposited more than 100ft above sea level, it's another marker of danger... although perhaps on a longer time scale. Hawaii has several examp

If you find coral deposited more than 100ft above sea level, it's another marker of danger... although perhaps on a longer time scale. Hawaii has several examples of this (coral found at sites over 500ft) from what are assumed to be Mega-tsunami. https://www.e-education.psu.edu/earth107/node/1610#:~:text=One%20possible%20piece%20of%20evidence,have%20been%20delivered%20by%20tsunami https://www.e-education.psu.edu/earth107/node/1610#:~:text=O....