[Baron von Richthofen (Vaclav)]

Originally Posted by space oddity

There are a number of web sites with calculators for meteorite impact damage eg www.lpl.arizona.edu/impacteffects/ They are kind of fun reading how a large asteroid such as yours would melt the earth's crust and do us humans in. Saw an interesting doco on Foxtel recently suggesting a decent sized asteroid impact in Antarctica had a contra-coup effect of causing the Siberian traps volcanic event, the possible cause of the geat dying event ~ 200-250 million years ago.
I dare say, your pet rock would well and truly wipe out most species, humans most definately, so stick your head between your legs............................... ...and kiss your a%$e goodbye

Thanks for the site, crunched the figures, virtually no damage, we live, but now we can clime into space, makes Everest look small
Your Inputs:

Distance from Impact: 5000.00 km = 3105.00 miles
Projectile Diameter: 1000000.00 m = 3280000.00 ft = 621.00 miles
Projectile Density: 3000 kg/m3
Impact Velocity: 0.03 km/s = 0.02 miles/s
Impact Angle: 90 degrees
Target Density: 1000 kg/m3
Target Type: Liquid Water of depth 1000.00 meters, over typical rock.
Energy:

Energy before atmospheric entry: 7.07 x 1023 Joules = 1.69 x 108 MegaTons TNT
The average interval between impacts of this size somewhere on Earth during the last 4 billion years is 2.4 x 108years
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 255 km = 158 miles

For the crater formed in the seafloor:
Transient Crater Diameter: 77.8 km = 48.3 miles
Transient Crater Depth: 27.5 km = 17.1 miles

Final Crater Diameter: 138 km = 85.6 miles
Final Crater Depth: 1.3 km = 0.81 miles
The crater formed is a complex crater.
At this impact velocity ( < 12 km/s), little shock melting of the target occurs.
Thermal Radiation:

At this impact velocity ( < 15 km/s), little vaporization occurs; no fireball is created, therefore, there is no thermal radiation damage.
Seismic Effects:


The major seismic shaking will arrive at approximately 1000 seconds.
Richter Scale Magnitude: 10.1 (This is greater than any earthquake in recorded history)
Mercalli Scale Intensity at a distance of 5000 km:
III. Felt quite noticeably by persons indoors, especially on upper floors of buildings. Many people do not recognize it as an earthquake. Standing motor cars may rock slightly. Vibrations similar to the passing of a truck.

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.

Ejecta:

The ejecta will arrive approximately 1570 seconds after the impact.
At your position the ejecta arrives in scattered fragments
Average Ejecta Thickness: 2.62 mm = 0.103 inches
Mean Fragment Diameter: 29.6 micrometers = 1.17 1/1000 of an inch

Air Blast:

The air blast will arrive at approximately 15200 seconds.
Peak Overpressure: 10100 Pa = 0.101 bars = 1.44 psi
Max wind velocity: 22.9 m/s = 51.2 mph
Sound Intensity: 80 dB (Loud as heavy traffic)
Damage Description:

Glass windows will shatter.