Distance from Impact: 20000.00 km = 12420.00 miles
Projectile Diameter: 8000000.00 m = 26240000.00 ft = 4968.00 miles
Projectile Density: 4250 kg/m^3
Impact Velocity: 20.00 km/s = 12.42 miles/s
Impact Angle: 15 degrees
Target Density: 2500 kg/m^3
Target Type: Sedimentary Rock
Energy before atmospheric entry: 2.28 x 10^32 Joules = 5.44 x 10^16 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 strongly disturbed by the impact, but loses little mass.
47.72 percent of the Earth is melted
The impact makes a noticeable change in the Earth's rotation period and tilt of its axis.
The impact does not shift the Earth's orbit noticeably.
Transient Crater Diameter: 10100 km = 6280 miles
Transient Crater Depth: 3580 km = 2220 miles
Final Crater Diameter: 33700 km = 20900 miles
Final Crater Depth: 6.83 km = 4.24 miles
The final crater is replaced by a large, circular melt province.
At this impact velocity ( < 12 km/s), little shock melting of the target occurs.
Melt volume = 3.88 times the crater volume
At this size, the crater forms in its own melt pool.
Time for maximum radiation: 6110 seconds after impact
Your position is inside the fireball.
The fireball appears 1240 times larger than the sun
Thermal Exposure: 2.36 x 10^13 Joules/m2
Duration of Irradiation: 159000 seconds
Radiant flux (relative to the sun): 149000
Effects of Thermal Radiation:
Much of the body suffers third degree burns
Deciduous trees ignite
The major seismic shaking will arrive at approximately 4000 seconds.
Richter Scale Magnitude: 15.8 (This is greater than any earthquake in recorded history)
Mercalli Scale Intensity at a distance of 20000 km:
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.
XI. As X. Rails bent greatly. Underground pipelines completely out of service.
Your position is in the region which collapses into the final crater.
The air blast will arrive at approximately 60600 seconds.
Peak Overpressure: 5.66e+08 Pa = 5660 bars = 80400 psi
Max wind velocity: 19200 m/s = 42800 mph
Sound Intensity: 175 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