User blog:Spinosaurus75DinosaurFan/Shaking a town

Requested by Legion350. Shaking a town about a mile in size.

I guess I can treat it as an unnatural earthquake?

I'll low-ball it and assume it is an earthquake starting from the centre of the town. The radius is half a mile then? Since the entire town shook I think a Mercalli scale of 3 or 4 is fine.

I'll just use this calculator and play with the other values until I get 3 or 4.

So my inputs:

Distance from Impact: 805.00 meters ( = 2640.00 feet )

Projectile diameter: 200.00 meters ( = 656.00 feet )

Projectile Density: 800 kg/m^3

Impact Velocity: 11.00 km per second ( = 6.83 miles per second )

Impact Angle: 45 degrees

Target Density: 1000 kg/m^3

Target Type: Liquid water of depth 200.0 meters ( = 656.0 feet ), over crystalline rock.

And I got Mercalli intensity III/IV.

The Ritcher scale magnitude is 3.3. Seismic waves radiated is 5.623413e+9 Joules according to this. Building level+