Originally Posted by Devilmaypoop
This is only around 500-800 megatons, only 10+ times bigger than the Tsar Bomba. It's only going to cause a large richer scale 6-7 earthquake in the nearby area if it hits land, and a utterly massive 300m+ tsunami if it hits water.
This won't have any global effects on the weather, etc.
The one that wiped dinosaurs had an impact equivalent to a 1 teraton of TNT. Do you know how much that is?
That's 1,000,000 megatons.
Err, I think your assumptions are a little bit downplayed...
Although simplistic fireball calculations predicted the fireball would impact the ground, the bomb's own shock wave reflected back and prevented this. The fireball reached nearly as high as the altitude of the release plane and was seen almost 1,000 kilometres (620 mi) from ground zero. The subsequent mushroom cloud was about 64 kilometres (40 mi) high (nearly seven times the height of Mount Everest), which meant that the cloud was well inside the Mesosphere when it peaked. The base of the cloud was 40 kilometres (25 mi) wide. All buildings in the village of Severny (both wooden and brick), located 55 kilometres (34 mi) from ground zero within the Sukhoy Nos test range, were completely destroyed. In districts hundreds of kilometers from ground zero, wooden houses were destroyed, and stone ones lost their roofs, windows and doors; and radio communications were interrupted for almost one hour. One participant in the test saw a bright flash through dark goggles and felt the effects of a thermal pulse even at a distance of 270 kilometres (170 mi). The heat from the explosion could have caused third-degree burns 100 km (62 mi) away from ground zero. A shock wave was observed in the air at Dikson settlement 700 kilometres (430 mi) away; windowpanes were partially broken to distances of 900 kilometres (560 mi). Atmospheric focusing caused blast damage at even greater distances, breaking windows in Norway and Finland. The seismic shock created by the detonation was measurable even on its third passage around the Earth. Its seismic body wave magnitude was about 5 to 5.25. The energy yield was around 7.1 on the Richter scale but, since the bomb was detonated in air rather than underground, most of the energy was not converted to seismic waves.
Now, as a conservative estimate, let's use 9x as a multiplier to these factors. In the case of Severny, which was utterly destroyed and being 55km away from the blast? That's 495km away.
The heat from such an impact could likely cause 3rd degree burns 900km away from ground zero. And I'd like to point this out:
Atmospheric focusing caused blast damage at even greater distances, breaking windows in Norway and Finland.
Using conservative estimates, IE measuring closest distances of Norway/Finland to the location of the bomb test location is roughly 1500km. I won't even try to extrapolate the result of the atmospheric focusing ranges on something like this.
Also note that they claim its impact on the richter scale was 5.0 to 5.25, but could have been as high as 7.1 had it be detonated underground. Which an asteroid of that magnitude hitting our planet would certainly count.
Now, of course, we haven't considered the ejected, vaporized matter of the earth and the asteroid itself and how it would react in the atmosphere.
Yet you doubt there will be global weather effects?
Perhaps not the the scale of what caused the extinction of the dinosaurs, but yeah, I think it is very safe to say that the weather will be effected on the global scale to some degree...