Space rock impact site(s)

[Turtle]

Originally Posted by freeztar

Cool article.

I don't quite understand their table though.

Why would an air blast arrive 40 minutes after impact?

Hmm...Maybe it has something to do with the initial shockwave?

Where's that Turtle when you need him?

where any self respecting turtle should be during an impact; hiding in a hole in the mud.

i agree the table is confusing without any calculations. 1,400 mph would reach 466.6 miles in 20 minutes and the distance between impact and the Gunflint site is given as 480 miles.

Originally Posted by Cedars

Researching proglacier lakes brought me to this link which is related to Post #7. Some good pics of rocks formed in part by the impact event.

For scale, this impact is much larger than the chicxulub impact.

Near the end is an estimation of max wind speeds (1400 mph), 1 - 3 meters of ejecta, and earthquakes.

http://www.geo.umn.edu/mgs/meteoriteimpact.pdf

the article has a promotional slant for the region, but nonetheless, a very cool impact and article. thanks Cedars. here's some reading on the physics of space rock impacts: >> Impact Geology, Chemistry and Physics
the game is afoot.

[Cedars]

Originally Posted by Turtle

where any self respecting turtle should be during an impact; hiding in a hole in the mud.

i agree the table is confusing without any calculations. 1,400 mph would reach 466.6 miles in 20 minutes and the distance between impact and the Gunflint site is given as 480 miles.

Looking back over the article, they used a computer program to calculate whatever:
"Collins, G.S., Melosh, J. H., Marcus, R.A., 2005, Earth impact effects
program: A web-based computer program for calculating the
regional environmental consequences of a meteoroid impact on
Earth; Meteorite and Planetary Science 40:817-840."