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Bernardo de La Paz

(51,817 posts)
1. Magnitude 11 earthquake 300 miles away jumbled up Mich banded iron formations & then
Tue Mar 12, 2024, 07:10 AM
Mar 2024

minutes later supersonic monster boulders make secondary impacts from the ejecta of the original crater. The speed of sound is about 1000 kph or 650 mph (1000 ft per second, about 11 miles per minute). The ejecta flew 300 miles and if it was at the speed of sound or some multiple, it arrived minutes later but less than 30 minutes later.

Estimated Sudbury impactor size: 7 to 10 miles in diameter of lots of heavy nickel. That's like a half dozen Mount Everests in one hypersonic (say Mach 20 to Mach 100) impact. Momentum (kinetic energy) p = mv2 which is mass times velocity squared. A car hitting a wall at 65 mph (100 kph) has some energy p. When the speed is Mach 20 which is about 2 km per sec or 7000 kph, the energy is 70 x 70 or about 5000 times as much. Mach 100 would be 5 x 5 x 5000 or 125,000 times as much.

Thank you for posting.

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