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Map of places in the US most likely to be hit by nuclear strikes.

Combine this with "wind rose" information for each location to determine most likely fallout coverage.
The Chicken Little crowd is predicting TEOTWAWKI, scientists say bah humbug...

A deadly supervolcano lies under Yellowstone — here's what would happen if it erupted

Supervolcanos are characterized as volcanic centers that have had eruptions that covered more than 240 cubic miles. The US has two: one at Yellowstone and another at Long Valley in California.

Yellowstone has had three major events in the past 2.1 million years, which led to the creation of the calderas, or large volcanic craters.

Scientists don't think Yellowstone's supervolcano would be erupting any time soon (at least not in the next thousand years). The odds of it erupting within a given year are one in 730,000, according to the US Geological Survey. So if you're planning a trip there, you shouldn't be too concerned.

If it did erupt, it could have some pretty extreme effects on the surrounding areas.

For starters, the eruption could emit ash that would expand over 500 miles... The explosion likely wouldn't wipe out human life, but it certainly would be destructive, especially to the western half of the US.
Back to OP

In the decades following WWII, the US spent lots of time and money researching the characteristics and effects of nuclear detonations, particularly fallout, especially when we did above-ground weapons testing before 1961. We know how to generate more fallout, or less fallout, or no fallout at all, by detonating the weapon at various heights above the ground.

But the generation of fallout is inversely proportional to destructive power, which means that if you want the biggest bang with the most destruction, which is the whole point of using such weapons, you won’t generate much fallout.

In the over 200 above-ground atomic and nuclear bomb tests in the 15 years following WWII, fallout was minor in 99% of them. Residual dose rates at almost all of these test sites today are very low (< 0.001 Sv/yr), less than the natural background radiation that was there before the tests.

On the other hand, the Castle Bravo test in the Pacific was probably the largest generator of fallout as it was detonated close to the ground and the yield was larger than we expected. At 15 megatons, that hydrogen bomb was the largest detonation ever by the United States and was one of the events that led to banning above-ground nuclear tests precisely because of the fallout.

As a result of Castle Bravo, nearby islands had to be evacuated and a Japanese fishing vessel was contaminated with enough fallout to sicken the crew and cause one death. The long struggle of the people of the Marshall Islands in response to this fallout has been horrible and unnecessary.

Fortunately, the DPRK does not have hydrogen bombs and likely won’t for some time.

Therefore, if an enemy wants to care about contaminating the future more than winning the present conflict, there could be areas that will be contaminated for a long time, although not thousands of years as geological and biological processes spread out and dilute contamination relatively quickly.

A good way to understand this problem is to look at the only two atomic weapon attacks in history. Little Boy, the Hiroshima U-bomb, was about 15 kilotons (15,000 tons of TNT equivalent), and Nagasaki, a Pu-bomb somewhat similar to DPRK’s bombs, was about 25 kilotons. There are no areas in either city, or anywhere else, that are still radioactive above background levels as a result of those detonations. They are certainly not dead zones.

This comparative unit of kilotons is not hyperbole. It means if you could have put 15,000 tons of TNT in one spot in Hiroshima, and ignited it all at the same moment, the effect would have been almost exactly the same as Little Boy. The same mushroom cloud, the same destruction, almost the same deaths.

It’s the pressure and the heat that do the real damage, not radiation. The blast and the fireball. The difference is that in an atomic blast, a large gamma and neutron radiation burst goes a little beyond the blast zone. The effects of that burst are relatively immediate and don’t last more than a microsecond.

200,000-plus deaths occurred at Hiroshima and Nagasaki in the initial seconds of the blast and in the months following as the effects of the initial burst manifested themselves. But only about 500 deaths came later from radiation-induced cancer and other long-term effects. None have been found to be from fallout.

It is critical to understand that the destruction from these two atomic blasts during WWII did not come close to the conventional destruction that lead up to them. In just the months between February and August 1945, the United States dropped 100,000 tons of high explosives and incendiaries on Japanese cities, including Tokyo, Nagoya, Osaka and Kobe, killing over 500,000 people and leveling hundreds of square miles, much more than the two atomics did together.

The real horror about using atomic or nuclear weapons is that conventional destruction takes an entire military to deliver over some length of time. So there is a chance to counter it. But delivery of nuclear weapons is quick and the effects are immediate, with little possibility to counter them.

The mess this world might be heading towards is much more complicated than science fiction, but radioactive fallout is one of the least of our worries.

Dr. James Conca is an expert on energy, nuclear and dirty bombs, a planetary geologist, and a professional speaker. Follow him on Twitter @jimconca and see his book at
Pacific Daily News Story On Guam Civil Defense Preparations

Guam Civil Defense Fact Sheet:
Don't think north Korea will do anything,don't think the USA will do anything Nuclear ,North Korean may fire missiles towards USA ,but the USA will just flatten Korea with conventional weapons ,and in my Lefty opinion I say fuck um ,don't fire missiles at a country with a big Arsenal

Agree with you here. If DPRK launches a multiple-missile "test" towards the waters near Guam, they would have to pass over Japan. The Japanese have been equipped with THAAD anti-missile systems provided by the US.

If any of the missiles get through the Japanese missile defences, there are additional seabourne systems deployed on US Navy ships of the Pacific Fleet, as well as on Guam.

I would fully expect the missiles to be shot down and the debris recovered to determine is there were any weapons aboard.
If the missiles would be indeed armed, whether nuclear or conventional, the US response will be appropriate. If the missiles prove to be unarmed, then THAAD passes a real world operational test and the DPRK loses face.