Earth Impact Effects ProgramInputs:Projectile Diameter: 200 m = 656.00 ft = 0.12 miles
Projectile Density: 8000 kg/m3
Impact Velocity: 25.00 km/s = 15.53 miles/s
Impact Angle: 90 degrees
Target Density: 1000 kg/m3
Target Type: Liquid Water of depth 4000 meters, over typical rock.
Energy:Energy before atmospheric entry: 1.05 x 1019 Joules = 2.50 x 103 MegaTons TNT
The average interval between impacts of this size somewhere on Earth during the last 4 billion years is 4.6 x 104years
Atmospheric Entry:The projectile begins to breakup at an altitude of 20400 meters = 66800 ft
The projectile reaches the ground in a broken condition. The mass of projectile strikes the surface at velocity 24.8 km/s = 15.4 miles/s
The impact energy is 1.03 x 1019 Joules = 2.45 x 103MegaTons.
The broken projectile fragments strike the ground in an ellipse of dimension 0.27 km by 0.27 km
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.
Crater Dimensions:
The crater opened in the water has a diameter of 8.83 km = 5.48 miles
For the crater formed in the seafloor:
Crater shape is normal in spite of atmospheric crushing; fragments are not significantly dispersed.
Transient Crater Diameter: 1.27 km = 0.788 miles
Transient Crater Depth: 0.449 km = 0.279 miles
Final Crater Diameter: 1.59 km = 0.986 miles
Final Crater Depth: 0.338 km = 0.21 miles
The crater formed is a simple crater
The floor of the crater is underlain by a lens of broken rock debris (breccia) with a maximum thickness of 157 m = 515 ft.
The volume of the target melted or vaporized is 127000 m3 = 4.49e+06 feet3
Roughly half the melt remains in the crater Thermal Radiation:Time for maximum radiation: 0.176 seconds after impact
Your position is inside the fireball.
The fireball appears 988 times larger than the sun
Thermal Exposure: 4.90 x 109 Joules/m2
Duration of Irradiation: 56.5 seconds
Radiant flux (relative to the sun): 86800
Effects of Thermal Radiation:Clothing ignites
Much of the body suffers third degree burns
Newspaper ignites
Plywood flames
Deciduous trees ignite
Grass ignites
Seismic Effects:The major seismic shaking will arrive at approximately 0.2 seconds.
Richter Scale Magnitude: 5.0
Mercalli Scale Intensity at a distance of 1 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.
Ejecta:The ejecta will arrive approximately 14.3 seconds after the impact.
Your position is beneath the continuous ejecta deposit.
Average Ejecta Thickness: 23.2 m = 76.1 ft
Air Blast:The air blast will arrive at approximately 3.03 seconds.
Peak Overpressure: 2.59e+08 Pa = 2590 bars = 36800 psi
Max wind velocity: 13000 m/s = 29000 mph
Sound Intensity: 168 dB (Dangerously Loud)
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.
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.