Wow, ask and ye shall receive! Good info, CJ.
Originally Posted by Beer w/Straw
Back to the initial question. According to this Earth Impact Calculator:
If you are at a Distance from Impact: 500.00 km = 310.50 miles
and if the following parameters are accurate...
Projectile Diameter: 2000.00 m = 6560.00 ft = 1.24 miles (roughly the largest fragment of Shoemaker-Levy 9)
Projectile Density: 1000 kg/m^3
Impact Velocity: 48.00 km/s = 29.81 miles/s
Impact Angle: 60 degrees
Target Density: 2500 kg/m^3
Target Type: Sedimentary Rock
Energy before atmospheric entry: 4.83 x 1021 Joules = 1.15 x 10^6 MegaTons TNT
The average interval between impacts of this size somewhere on Earth during the last 4 billion years is 5.1 x 10^6years
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: 21.2 km = 13.2 miles
Transient Crater Depth: 7.5 km = 4.66 miles
Final Crater Diameter: 31.7 km = 19.7 miles
Final Crater Depth: 0.838 km = 0.52 miles
The crater formed is a complex crater.
The volume of the target melted or vaporized is 36.6 km^3 = 8.79 miles^3
Roughly half the melt remains in the crater, where its average thickness is 104 meters = 340 feet
Time for maximum radiation: 0.706 seconds after impact
Visible fireball radius: 14 km = 8.7 miles
The fireball appears 6.37 times larger than the sun
Thermal Exposure: 2.74 x 106 Joules/m^2
Duration of Irradiation: 437 seconds
Radiant flux (relative to the sun): 6.27
Effects of Thermal Radiation:
Much of the body suffers second degree burns
Deciduous trees ignite
The major seismic shaking will arrive at approximately 100 seconds.
Richter Scale Magnitude: 8.7
Mercalli Scale Intensity at a distance of 500 km:
VI. Felt by all, many frightened. Some heavy furniture moved; a few instances of fallen plaster. Damage slight.
VII. Damage negligible in buildings of good design and construction; slight to moderate in well-built ordinary structures; considerable damage in poorly built or badly designed structures; some chimneys broken.
The ejecta will arrive approximately 334 seconds after the impact.
Average Ejecta Thickness: 1.45 cm = 0.569 inches
Mean Fragment Diameter: 2.91 mm = 0.115 inches
The air blast will arrive at approximately 1520 seconds.
Peak Overpressure: 29100 Pa = 0.291 bars = 4.13 psi
Max wind velocity: 61.3 m/s = 137 mph
Sound Intensity: 89 dB (Loud as heavy traffic)
Wood frame buildings will almost completely collapse.
Glass windows will shatter.
About 30 percent of trees blown down; remainder have some branches and leaves blown off.