When I ask the impact-effects calculator http://www.lpl.arizona.edu/impacteffects/ for a 1km asteroid impacting at a six-degree angle at cosmic speeds, it gives a 3-gigaton explosion, and the largest crater in the three-by-thirty-mile crater field is a mile across. The blast wave would demolish steel-framed buildings at 20km; but, thanks to the inverse-square law, 2000km away in Israel a loud noise would be heard. The asteroid started breaking up about 700km out from impact at an altitude of 70km, and deposited 24Gtons of energy over that period.
Kofels doesn't look like a field of one-mile craters and isn't full of shocked quartz; there is some melted rock, but I'm prepared to accept that when a mountain is sliding at 30kmph the friction is quite enough to melt rock.
I could just about believe a Sumerian description of an impact; but I don't believe the connection with Kofels in the slightest.
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Date: 2008-03-31 03:20 pm (UTC)Kofels doesn't look like a field of one-mile craters and isn't full of shocked quartz; there is some melted rock, but I'm prepared to accept that when a mountain is sliding at 30kmph the friction is quite enough to melt rock.
I could just about believe a Sumerian description of an impact; but I don't believe the connection with Kofels in the slightest.