Oh, this one wouldn't end life on earth or anything; wouldn't want to be within a hundred miles or so of the impact though......
Unsure of the tsunami size if it hit an ocean; 1,600 megatons is a lot less energy than the Chilean Earthquake of 1960 (largest quake known) at 11,000 megatons.
Right. It isn't the end of the world. But, if it hits, it will wreck a LARGE swath of the planet. Tsar Bomba, the Soviets' 50 megaton monster, would inflict 2nd degree burns out to 100km. This is 30X larger. So, if you don't mind, I'll let you have the front row seats at 100 miles. I'll be at least 500 miles away