OK , I dropped it right smack in the middle of USA,
heres the result on either coast.....
Robert Marcus, H. Jay Melosh, and Gareth Collins
Distance from Impact: 2093.00 km = 1299.75 miles
Projectile Diameter: 482802.00 m = 1583590.56 ft = 299.82 miles
Projectile Density: 3000 kg/m3
Impact Velocity: 20.00 km/s = 12.42 miles/s
Impact Angle: 45 degrees
Target Density: 2500 kg/m3
Target Type: Sedimentary Rock
Energy before atmospheric entry: 3.54 x 1028 Joules = 8.45 x 1012 MegaTons TNT
The average interval between impacts of this size is longer than the Earth's age.
Such impacts could only occur during the accumulation of the Earth, between 4.5 and 4 billion years ago.
Major Global Changes:
The Earth is not strongly disturbed by the impact and loses negligible mass.
The impact does not make a noticeable change in the Earth's rotation period or the tilt of its axis.
The impact does not shift the Earth's orbit noticeably.
Transient Crater Diameter: 1410 km = 875 miles
Transient Crater Depth: 498 km = 309 miles
Final Crater Diameter: 3640 km = 2260 miles
Final Crater Depth: 3.49 km = 2.17 miles
The crater formed is a complex crater.
The volume of the target melted or vaporized is 2.22e+08 km3 = 5.34e+07 miles3
Roughly half the melt remains in the crater , where its average thickness is 143 km = 88.6 miles
Time for maximum radiation: 328 seconds after impact
Your position is inside the fireball.
The fireball appears 676 times larger than the sun
Thermal Exposure: 3.60 x 1012 Joules/m2
Duration of Irradiation: 85300 seconds
Radiant flux (relative to the sun): 42200
Effects of Thermal Radiation:
Much of the body suffers third degree burns
Deciduous trees ignite
The major seismic shaking will arrive at approximately 419 seconds.
Richter Scale Magnitude: 13.3 (This is greater than any earthquake in recorded history)
Mercalli Scale Intensity at a distance of 2093 km:
IX. General panic. Damage considerable in specially designed structures; well-designed frame structures thrown out of plumb. Damage great in
substantial buildings, with partial collapse. Buildings shifted off foundations. Serious damage to reservoirs. Underground pipes broken. Conspicuous
cracks in ground. In alluviated areas sand and mud ejected, earthquake fountains, sand craters.
X. Most masonry and frame structures destroyed with their foundations. Some well-built wooden structures and bridges destroyed. Serious damage to
dams, dikes, embankments. Large landslides. Water thrown on banks of canals, rivers, lakes, etc. Sand and mud shifted horizontally on beaches and flat
land. Rails bent slightly.
The ejecta will arrive approximately 788 seconds after the impact.
Your position is in the region which collapses into the final crater.
Your position is beneath the continuous ejecta deposit.
Average Ejecta Thickness: 3840 m = 12600 ft
Peak Overpressure: 1.23e+08 Pa = 1230 bars = 17400 psi
Max wind velocity: 8910 m/s = 19900 mph
Sound Intensity: 162 dB (Dangerously Loud)
Multistory wall-bearing buildings will collapse.
Wood frame buildings will almost completely collapse.
Multistory steel-framed office-type buildings will suffer extreme frame distortion, incipient collapse.
Highway truss bridges will collapse.
Highway girder bridges will collapse.
Glass windows will shatter.
Cars and trucks will be largely displaced and grossly distorted and will require rebuilding before use.
Up to 90 percent of trees blown down; remainder stripped of branches and leaves.