Friday, April 13th, 2029

Input:
Distance from Impact: 200.00 km = 124.20 miles
Projectile Diameter: 440.00 m = 1443.20 ft = 0.27 miles
Projectile Density: 3000 kg/m3
Impact Velocity: 12.00 km/s = 7.45 miles/s
Impact Angle: 45 degrees
Target Density: 2500 kg/m3
Target Type: Sedimentary Rock

Energy:

Energy before atmospheric entry: 9.63 x 1018 Joules = 2.30 x 103 MegaTons TNT
The average interval between impacts of this size somewhere on Earth during the last 4 billion years is 4.3 x 104years

Crater:
Crater shape is normal in spite of atmospheric crushing; fragments are not significantly dispersed.

Transient Crater Diameter: 4.65 km = 2.89 miles
Transient Crater Depth: 1.64 km = 1.02 miles

Final Crater Diameter: 5.71 km = 3.55 miles
Final Crater Depth: 0.5 km = 0.31 miles

Seismic Events:


The major seismic shaking will arrive at approximately 40 seconds.
Richter Scale Magnitude: 6.8
Mercalli Scale Intensity at a distance of 200 km:

IV. Felt indoors by many, outdoors by few during the day. At night, some awakened. Dishes, windows, doors disturbed; walls make cracking sound. Sensation like heavy truck striking building. Standing motor cars rocked noticeably.

V. Felt by nearly everyone; many awakened. Some dishes, windows broken. Unstable objects overturned. Pendulum clocks may stop.

Ejecta:

The ejecta will arrive approximately 206 seconds after the impact.
At your position there is a fine dusting of ejecta with occasional larger fragments
Average Ejecta Thickness: 521 micrometers = 20.5 1/1000 of an inch
Mean Fragment Diameter: 5.65 mm = 0.222 inches

cynicminded said:
Holy Crap!!!! that's my birthday too!!!

Kobi said:

*High fives*

loudog1 said:
If you're interested in this kind of stuff, there a really good book by Larry Niven and Jerry Pournelle called Lucifer's Hammer. It's a little dated, but good, solid, sci-fi reading.

Hopefully Bruce Willis and Ben Affleck will still be around to go blow it up.

Your Inputs:
Distance from Impact: 100.00 km = 62.10 miles
Projectile Diameter: 440.00 m = 1443.20 ft = 0.27 miles
Projectile Density: 4000 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:
Energy before atmospheric entry: 3.57 x 1019 Joules = 8.52 x 10^3 MegaTons TNT


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.



Thermal Radiation:

Visible fireball radius: 5.62 km = 3.49 miles
The fireball appears 12.8 times larger than the sun
Thermal Exposure: 1.32 x 105 Joules/m2
Duration of Irradiation: 8.32 seconds

Seismic Effects:

The major seismic shaking will arrive at approximately 20 seconds.
Richter Scale Magnitude: 7.2
Mercalli Scale Intensity at a distance of 100 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.


Air Blast:

The air blast will arrive at approximately 303 seconds.
Peak Overpressure: 26600 Pa = 0.266 bars = 3.78 psi
Max wind velocity: 56.7 m/s = 127 mph
Sound Intensity: 89 dB (Loud as heavy traffic)
Damage Description:


Interior partitions of wood frame buildings will be blown down. Roof will be severely damaged.

Glass windows will shatter.

About 30 percent of trees blown down; remainder have some branches and leaves blown off.

Hopefully Bruce Willis and Ben Affleck will still be around to go blow it up.

Energy:
Energy before atmospheric entry: 1.36 x 1021 Joules = 3.24 x 10^5 MegaTons TNT


Thermal Radiation:

Time for maximum radiation: 0.315 seconds after impact

Visible fireball radius: 20.4 km = 12.6 miles
The fireball appears 46.3 times larger than the sun
Thermal Exposure: 5.38 x 106 Joules/m2
Duration of Irradiation: 27.5 seconds
Radiant flux (relative to the sun): 196

Effects of Thermal Radiation:


Much of the body suffers third degree burns

Newspaper ignites

Deciduous trees ignite

Grass ignites


Seismic Effects:

The major seismic shaking will arrive at approximately 20 seconds.
Richter Scale Magnitude: 8.2
Mercalli Scale Intensity at a distance of 100 km:

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.

VIII. Damage slight in specially designed structures; considerable damage in ordinary substantial buildings with partial collapse. Damage great in poorly built structures. Fall of chimneys, factory stacks, columns, monuments, walls. Heavy furniture overturned.


Air Blast:

The air blast will arrive at approximately 303 seconds.
Peak Overpressure: 283000 Pa = 2.83 bars = 40.2 psi
Max wind velocity: 360 m/s = 806 mph
Sound Intensity: 109 dB (May cause ear pain)
Damage Description:


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.

Glass windows will shatter.

Up to 90 percent of trees blown down; remainder stripped of branches and leaves.

SaintLucifer said:
Of course, this is 25 years out, and we ought to have a missle system capable of taking out asteriods by that time.

thunderboltz said:
man, I hope thats not going to be as disappointing as:
The second coming of Jesus Christ, when he returns to earth after almost two millennia.
The war of Armageddon -- a massive battle in Israel.
The arrival on earth of the Antichrist, an evil political, military leader.
The Tribulation, a seven year interval of great suffering and death.
The Rapture, when Christians who have been born again -- both living and dead -- will rise into the sky towards Jesus.
Y2K.
The first alignment of Mercury, Venus, Earth, Mars, Jupiter and Saturn in 6,000 years would cause total devastation. Ice buildup at the south pole would upset the world's axis, sending trillions of tons of ice and water sweeping over the planet.
and other failed prophecies/predictions.