A new initiative by Carlos Labs lets you find out the area of impact in such an eventuality.
Ground Zero has various preset bombs which you could explore from 7 Kilotons to 400 Kilotons.
The website also has an option for an Asteroid strike for you to check out.
But if you like a clean UI and only want to study the impact, head over toGround Zeronow.
source: www.techworm.net