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ディープ・インパクトを貴方のマシンに」記事へのコメント

  • by teltel (1423) on 2004年04月14日 13時38分 (#531633) 日記
    100km 先に直径100m の岩石が20km/s 、25度で水面に落っこちるとどうなるか…。直径約2kmのクレーターができ、73dB の音が聞こえるそうな。
    Your Inputs:
            Distance from Impact: 100.00 km = 62.10 miles
            Projectile Diameter: 100.00 m = 328.00 ft = 0.06 miles
            Projectile Density: 2700 kg/m3
            Impact Velocity: 20.00 km/s = 12.42 miles/s
            Impact Angle: 25 degrees
            Target Density: 1000 kg/m3
            Target Type: Competent Rock or saturated soil
    Energy:
            2.83 x 1017 Joules = 6.75 x 101 MegaTons TNT
            The average interval between impacts of this sizesomewhere on Earth is 2.8 x 103years

    Crater Size:
            Transient Crater Diameter: 2.08 km = 1.29 miles
            Final Crater Diameter: 2.30 km = 1.43 miles
            The crater formed is a simple crater
    Thermal Radiation:
            Time for maximum radiation: 0.07 seconds after impact
            Visible fireball radius: 0.5 km = 0.3 miles
            The fireball appears 1.2 times larger than the sun
            Thermal Exposure: 3.87 x 102 Joules/m2
            Duration of Irradiation: 2 seconds
            Radiant flux (relative to the sun): 0.2
    Seismic Effects:
            The major seismic shaking will arrive at approximately 20.0 seconds.
            Richter Scale Magnitude: 5.8
            Mercalli Scale Intensity at a distance of 100 km:

                        IV. Hanging objects swing. Vibration like passing of heavy trucks; or sensation of a jolt like a heavy ball striking the walls. Standing motor cars rock. Windows, dishes, doors rattle. Glasses clink. Crockery clashes. In the upper range of IV wooden walls and frame creak.

                        V. Felt outdoors; direction estimated. Sleepers wakened. Liquids disturbed, some spilled. Small unstable objects displaced or upset. Doors swing, close, open. Shutters, pictures move. Pendulum clocks stop, start, change rate.
    Ejecta:
            Most ejecta is blocked by Earth's atmosphere
    Air Blast:
            The air blast will arrive at approximately 333.3 seconds.
            Peak Overpressure: 4730.0 Pa = 0.0473 bars = 0.6717 psi
            Max wind velocity: 9.9 m/s = 22.2 mph
            Sound Intensity: 73 dB (Loud as heavy traffic)

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