Posted tagged ‘fallout calculator’

Mapping an explosion: blast map calculators

June 16, 2008

I found some interactive blast map calculators that were mildly entertaining to my inner-geek. Unfortunately, I couldn’t achieve 100% functionality, which might be because I’m on a Mac (I’ve not tried them on a PC yet). Nonetheless, they’re link-worthy:

Fallout Calculator – from the Federation of American Scientists (FAS). You can choose from a selection of major international cites (New York City is noticeably absent), wind speed, wind direction and bomb yield. On my Mac I could not adjust the bomb yield (I tried using both Safari and Firefox). The results, a series of concentric ovals, “depict calculated radiation doses of 300, 25, and 1 REM at 96 hours after detonation.” Clicking anywhere on the map will move the location of detonation to that point. FAS, an organization endorsed by 69 Noble Laureates, was founded in 1945 by scientists who had worked on the Manhattan Project to develop the first atomic bomb. A main focus of the group is to reduce nuclear weapons.

Nuclear Weapon Effects Calculator – also from the FAS. This tool is “to give an idea of the devastating blast effects of ground-level, shallow subsurface, and low-altitude nuclear weapon detonations.” Choose a city (New York again is absent) and a bomb yield. Clicking anywhere on the map will move the location of detonation to that point. The results are three concentric circles, which are not explained.

The High-Yield Detonation Effects Simulator (HYDESim) – an experiment in AJAX and Google Maps programming by Eric A. Meyer. Based on public data (from the classic book, The Effects of Nuclear Weapons), it shows “overpressure,” which is the destructive air pressure or shock wave created by the bomb measured in pounds per square inch (psi). You pick the bomb yield and four concentric circles show the overpressure created at four distances from the point of detonation. I had difficulty moving the point of detonation around the google map. You can find additional coordinates (latitude and longitude) for cities by clicking here. It’s interesting to note that a 10 kiloton bomb creates 0.25 psi at 4.01 mile and “most glass surfaces, such as windows, will shatter within this ring, some with enough force to cause injury.” Note to self: if the U.S. is ever threatened with an imminent attack, move desk away from window.

Blast Maps – from the website for the book, Nuclear Terrorism: The Ultimate Preventable Catastrophe, by Graham Allison of the Belfar Center for Science and International Affairs at the John F. Kennedy School of Government. Internet Explorer and a PC are required so I’ve not messed with this one yet

Nuclear Bomb Effects Computer – online retro edition – Wow, this is cool. During the Cold War you could purchase a circular slide rule from the U.S. Government Printing Office based on information from the classic book, The Effects of Nuclear Weapons (same source for the HYDESim above). John Walker has recreated this calculator online in a unique way: for blast affects you input the variables of bomb yield and distance, and for radiation affects you input time and dose rate. The output is an image of the original slide rule showing the results. Click here for the instructions.