PF 010 Final Watch

[ArmySGT.]

Who has their 4th Edition handy?

What is the mass, velocity, and descent angle of the meteor impacts in the Pacific ocean in 4th edition?

I would like to plug them into this to calculate the Tsunami effects on the U.S. West Coast.

http://impact.ese.ic.ac.uk/ImpactEffects/

[Project_Sardonicus]

Defnitley the idea that this was the Sovs as mentioned back in the rule book seemed a disapointment.

I always thought collectivisiation and group think would rather suit TEOTWAWKI.

And teams would be bumping into succesful collective farms with red stars, comissars and agitprop films.

[mmartin798]

Originally Posted by ArmySGT.

Who has their 4th Edition handy?

What is the mass, velocity, and descent angle of the meteor impacts in the Pacific ocean in 4th edition?

I would like to plug them into this to calculate the Tsunami effects on the U.S. West Coast.

http://impact.ese.ic.ac.uk/ImpactEffects/

Sadly they do not provide information that specific. All we know about 2016 E3 is that is was over 5km in diameter and the resulting impact was 10 million megaton. The location is "northern Pacific". I use Impact! at http://www.purdue.edu/impactearth/ for my calculation. If we assume it was dense rock, a 45° impact at 35 km/s with water depth of 3000m results in a 28.7 million megaton impact. So our asteroid is either less dense or slower. For the sake of simplicity, we will assume that it is dense rock since in the documentary Armageddon it was difficult to drill. Using all the same parameters for everything else and setting velocity to 20km/s gives energy of 9.38 million megatons. One more time at 21 km/s gives 10.3 million megatons. Close enough.

The effects from this impact are significant. The first effect is a thermal wave causing massive third degree burns and lighting most light wood on fire. Next comes the 9.1 earthquake. This is followed by a rain of ejecta that will end up about 38 ft deep with average particle size of 14 inches. Then come the arblast, providing a peak 570 psi overpressure. Finally the tsunami arrives, with a height between 975 and 1950m. Being this close to the impact pretty much makes this portion of the west coast a dead zone.

[ArmySGT.]

Originally Posted by mmartin798

The effects from this impact are significant. The first effect is a thermal wave causing massive third degree burns and lighting most light wood on fire. Next comes the 9.1 earthquake. This is followed by a rain of ejecta that will end up about 38 ft deep with average particle size of 14 inches. Then come the arblast, providing a peak 570 psi overpressure. Finally the tsunami arrives, with a height between 975 and 1950m. Being this close to the impact pretty much makes this portion of the west coast a dead zone.

My reasoning why Lonestar and Final Watch can't be made into 4th edition. The coastlines are just destroyed. In the case of Lonestar, the tsunami will have swept inland for hundreds of miles.

[nuke11]

Here are the details of the asteroid used in the 4th edition (this information was cut). I received this from Robert back in November 2013.

5km diameter asteroid (density 3 g/cc) striking the mid-Pacific Ocean (water depth 4km) at 17 km per second at 45 degrees angle of incidence.

Impact energy: about 10 million megatons equivalent.
Blast: 1psi radius 2,800km
Full thickness burn radius 850km
Earthquake: magnitude 9.4 with epicentre impact point. Damage present in an
area about the size of the United States - this just makes the seas more
violent around the impact area in this case.
Firestorms: upper atmospheric heating due to re-entry of ejecta over the
first few hours. This acts like an oven for up to 4 hours. Peak surface
temperatures in the worst affected areas are up to 200 degrees C (392 F).
Some self-shielding from cloud formations moderate the effect in some
regions. This occurs over half the earth.
Tsunamis: Waves of 10-20m push up to 30km inland along every coastline on
the Pacific Ocean up to 10 hours after impact (propagation speed
600-900km/h).
* Effects of several months duration:
- Darkness for first month due to atmospheric dust loading - photosynthesis
is impossible in worst affected regions (most of the world). It gets
*cold* - Last Glacial Maximum levels (5C - 9F drop in global average
temperatures in the first 2 weeks).
- Recovery of optical transparency over next 6 months
- Local cooling due to atmospheric soot loading (fires) - washout leads to
acid rain.
Acid rain aggravated by nitrogen oxides produced in impact.
* Effects of several years duration:
- Ozone reduction from NOx reaching stratosphere - global declines and
worsening of known 'ozone holes'.
- Cooling due to persistent stratospheric dust loading and sulphate
injection analogous to volcanos.
This maintains the initial depressed temperatures generated from injected
dust.
- Acid rain as sulphate and dust is cleared
* Effects of several decades duration:- Warming from stratospheric injection of water and carbon dioxide from the
impact event. This may be limited by high-altitude clouds increasing albedo.
All this is absolutely catastrophic - but it's not the Chicxulub impact
(~100 million megatons) which caused global acidification of the oceans -
the impact site was rich in sulphur containing minerals - in addition to all
the above effects at greater intensity and duration. Which appears to be the
'no land creature bigger than 10kg survives' level.

[.45cultist]

Originally Posted by ArmySGT.

My reasoning why Lonestar and Final Watch can't be made into 4th edition. The coastlines are just destroyed. In the case of Lonestar, the tsunami will have swept inland for hundreds of miles.

I drop the whole meteorite thing, Bruce Morrow's tampering couldn't have pulled that off. I use an imperfect pandemic leading to nuke war.