Doomsday calculator!

A while ago I explored technology that can move an asteroid away from a not-so-friendly Earth visit. Space.com has an article on the effects of an inpact and a website that can generate a damage area to any city you input.

To quote:

But hurling big virtual rocks at the planet is admittedly kind of fun. And
in this case it's at least more scientifically meaningful than the average video
game. I started by dropping a 9.3-mile-wide (15-kilometer) asteroid -- the
estimated size of the suspected
dinosaur killer -- on San Francisco.
The Bay Area doesn't do so
well.
The resulting crater, at 113 miles (181 kilometers) wide, pretty much
tells the story. The entire metropolis vanishes faster than you can say where
you left your heart. What isn't consumed is knocked over in an earthquake of
magnitude 10.2, bigger than any in recorded history. Heat from a scorching
fireball would turn much of the state, and parts of others, into toast.
The
quick end to the Bay Area turns out to be a blessing compared to what Los
Angeles residents face.
About 10 seconds after impact, radiation from the
fireball sears Southern California, igniting clothing and even plywood. Within
two minutes the ground under Hollywood begins to shake. Weak brick structures
crumble. Concrete irrigation ditches are damaged. Frame houses not properly
bolted to their foundations are knocked off. Even tree branches fall.

Isn't science fun?