Re:A 390FT rock will scrape past Earth closer than the Moon ...
by dredmorbius on Tuesday July 23, 2019 @05:17PM
(#20510292)
Vulcanism has a ... generally ... bounded upper scale,[1] astronomical impactors do not, and demonstrably modest impactors have had devastating results, with numerous candidates existing. Fortunately they're sparsely distributed.
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Notes:
1. Volcanic traps caused by flood basalt eruptions being an extreme outlier upper bound, see the Siberian Traps, 500 million ya, as a notable example.
There have been 18 identified, most 100s of millions to billions of years ago, though as recently as 10 mya. Yellowstone is among the younger (17 mya). The events may be associated with meteor impacts as well -- evidence is poorly preserved.
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Notes:
1. Volcanic traps caused by flood basalt eruptions being an extreme outlier upper bound, see the Siberian Traps, 500 million ya, as a notable example.
https://en.wikipedia.org/wiki/Siberian_Traps
There have been 18 identified, most 100s of millions to billions of years ago, though as recently as 10 mya. Yellowstone is among the younger (17 mya). The events may be associated with meteor impacts as well -- evidence is poorly preserved.
https://en.wikipedia.org/wiki/Flood_basalt