Please note: the results below are estimates based on current (limited) understanding of the impact process and come with large uncertainties; they should be used with caution, particularly in the case of peculiar input parameters. All values are given to three significant figures but this does not reflect the precision of the estimate. For more information about the uncertainty associated with our calculations and a full discussion of this program, please refer to this article
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Your Inputs:
- Distance from Impact: 20000.00 km ( = 12400.00 miles )
- Projectile diameter: 3.00 km ( = 1.86 miles )
- Projectile Density: 2100 kg/m3
- Impact Velocity: 17.00 km per second ( = 10.60 miles per second )
- Impact Angle: 45 degrees
- Target Density: 2500 kg/m3
- Target Type: Sedimentary Rock
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Energy:
- Energy before atmospheric entry: 4.29 x 1021 Joules = 1.02 x 106 MegaTons TNT
- The average interval between impacts of this size somewhere on Earth during the last 4 billion years is 4.7 x 106years
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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 tilt of Earth's axis (< 5 hundreths of a degree).
- The impact does not shift the Earth's orbit noticeably.
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Crater Dimensions:
- What does this mean?
- Transient Crater Diameter:
22.1 km ( = 13.7 miles )
- Transient Crater Depth: 7.82 km ( = 4.85 miles )
- Final Crater Diameter:
33.3 km ( = 20.6 miles )
- Final Crater Depth: 850 meters ( = 2790 feet )
- The crater formed is a complex crater.
- The volume of the target melted or vaporized is 26.8 km3 = 6.44 miles3
- Roughly half the melt remains in the crater, where its average thickness is 70 meters ( = 229 feet ).
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Thermal Radiation:
- What does this mean?
- The fireball is below the horizon. There is no direct thermal radiation.
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Seismic Effects:
- What does this mean?
The major seismic shaking will arrive approximately 1.11 hours after impact.- Richter Scale Magnitude: 8.6
- Mercalli Scale Intensity at a distance of 20000 km:
Nothing would be felt. However, seismic equipment may still detect the shaking.
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Ejecta:
- What does this mean?
- Little rocky ejecta reaches this site; fallout is dominated by condensed vapor from the projectile.
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Air Blast:
- What does this mean?
The air blast will arrive approximately 16.8 hours after impact.- Peak Overpressure: 277 Pa = 0.00277 bars = 0.0393 psi
- Max wind velocity: 0.652 m/s = 1.46 mph
- Sound Intensity: 49 dB (Easily Heard)
Tell me more...
Click here for a pdf document that details the observations, assumptions, and equations upon which this program is based. It
describes our approach to quantifying the important impact processes that might affect the people, buildings, and landscape in the
vicinity of an impact event and discusses the uncertainty in our predictions. The processes included are: atmospheric entry, impact
crater formation, fireball expansion and thermal radiation, ejecta deposition, seismic shaking, and the propagation of the atmospheric
blast wave.
Recent improvements in the airblast calculation are described here.
Earth Impact Effects Program Copyright 2004, Robert Marcus, H.J. Melosh, and G.S. Collins
These results come with ABSOLUTELY NO WARRANTY