Enmity : a scattershot Future History as a Collection of many very short stories : Duringmath
Constructed Entity Jacon
Report on NEO EMlii508 (Emily) Impact 2294:05:14:19:33:03 PST
Inputs from Ground Sensor (location : White River National Forest) :
Impact Distance: 4980.00 km ( = 3090.00 miles )
Object Diameter: 36.20 km ( = 22.50 miles )
Object Density: 8014 kg/m3
Impact Velocity: 32.20 km per second ( = 20.00 miles per second )
Impact Angle: 65.4 degrees
Target Type: Sedimentary rock, over crystalline rock.
Estimated Energy of the Impact
The energy before atmospheric entry was 1.03 x 1026 Joules which is equal to 2.46 x 1010 MegaTons of TNT. There are no records of similar impacts in Earth’s history. Predictions of recurrence are unavailable at this time.
No Major Global Changes Predicted:
The Earth will not be strongly disturbed by the impact and will not lose measurable mass. The impact will not make a noticeable change in the tilt of Earth's axis (< 5 hundredths of a degree). Because of the direction and location of impact, the collision may cause a change in the length of the day of up to 208 milliseconds. The impact has not shifted the Earth's orbit noticeably.
Expect Slight Geological Disruption:
The impact affected a diameter of 554 km ( = 344 miles ). A complex crater formed in the landscape, dimensions follow:
Transient Crater Diameter: 339 km ( = 210 miles )
Transient Crater Depth: 120 km ( = 74.4 miles )
Final Crater Diameter: 726 km ( = 451 miles )
Final Crater Depth: 2.15 km ( = 1.33 miles )
The volume of the regolith melted or vaporized is 833000 km3 or approximately 200000 miles3
Roughly half the melt remains in the crater, where its average thickness is 9.26 km ( = 5.75 miles ).
The most intense portion of the fireball was below the horizon. There was no direct thermal radiation to population centers near the sensor location.
Damage Predictions Follow, Immediate Action Required.
The major seismic shaking will arrive approximately 16.6 minutes after the impact. 11.3 minutes remain. I predict a Richter Scale Magnitude of 11.6 (This is greater than any earthquake in recorded history). The Mercalli Scale Intensity at sensor location will be:
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.
Considerable ejecta will arrive approximately 26.1 minutes after the impact. At sensor position there is a fine dusting of ejecta with occasional larger fragments as follows:
Average Ejecta Thickness: 95 cm ( = 37.4 inches )
Mean Fragment Diameter: 166 microns ( = 6.53 thousandths of an inch )
Warning
Significant air blast danger approximately 4.19 hours after impact.
Peak Overpressure will be 221000 Pa = 2.21 bars = 31.4 psi
Max wind velocity: 306 m/s = 685 mph
Sound Intensity: 107 dB (May cause ear pain)
Estimated Damage Description Follows:
Multistory wall-bearing buildings will collapse.
Wood frame buildings will almost completely collapse.
Highway truss bridges will collapse.
Glass windows will shatter.
Up to 90 percent of trees blown down; remainder stripped of branches and leaves.
Predictions for areas beyond sensor range are too diverse to estimate. Damage drops considerably to the South West and rises catastrophically to the North East.
Immediate Action Required
9.4 minutes remain until first effects.
End of report, Constructed Entity Jacon.
Calculations via http://impact.ese.ic.ac.uk/ImpactEffects/
Image via Imgur (NASA)
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