Is Li’l Kim Planning An EMP Attack On The US Homeland?

Dr. Peter Vincent Pry thinks so.  Pry is a member of a Congressional Task Force on EMP (electromagnetic pulse) weapons.  He recently described two Nork satellites that are in orbits which cross the continental US.  Pry believes these satellites may have nuclear weapons on board, which if detonated in our atmosphere, could devastate our “soft” electric power infrastructure, not to mention cell and internet communications.  The Soviet Union orbited similar satellites decades ago in a direct violation of UN agreements to keep outer space nuclear-free.  Other observers have suggested that the recent Nork low-altitude launch “failure”was actually a test of their ability to detonate a satellite/warhead at a precise, desired moment.   Here’s one report:

– – Wednesday, May 10, 2017

Kim Jong-un has been making many threats lately about striking the U.S. mainland and turning America into a ball of fire. The executive director of the Task Force on National and Homeland Security, Dr. Peter Vincent Pry, who also sits on a Congressional committee regarding the issue, warns that North Korea could already be planning a satellite borne EMP attack which could kill millions in North America.

There have been many reports lately on the damage an electromagnetic pulse attack (EMP) attack would inflict on the homeland. All electronic capability would be instantly destroyed. This would mean no food production, no computers, no water, no energy. Millions of Americans could starve.

North Korea is practicing a “cyberage version” of battleship diplomacy so they can always have “one of [their satellites] very close to being over the United States,” said Dr. Pry, writes The Independent. Detonating a high-altitude nuclear pulse over the United States would be devastating. The hermit kingdom launched two satellites in 2012 and 2014 that overfly the United States every 94 minutes.


Dr. Pry believes the North Koreans may want to use an EMP attack capability as a bargaining chip against the United States’ efforts to ramp up the pressure on the North through sanctions, military pressure, and an American alliance with the Chinese against the North.

Others, however, doubt that Everyone’s Favorite Little Fat Dictator really has the capability to do any serious damage.  Jack Liu of 38North does not believe Nork warheads are powerful enough to generate a damaging pulse:

A North Korean Nuclear EMP Attack? … Unlikely

05 May 2017

Recent press articles warn about the possibility of the North Koreans launching an electromagnetic pulse (EMP) attack on the United States, and there are even suggestions that the recent missile test failures may represent a thinly veiled EMP threat. However, such an attack from North Korea is unlikely, as it would require the North to have much larger nuclear weapons and the missile capability to deliver them.EMP Concerns

The Report of the Commission to Assess the Threat to the US from EMP Attack[1] states:

When a nuclear explosion occurs at high altitude, the EMP signal it produces will cover the wide geographic region within the line of sight of the detonation. This broad band, high amplitude EMP, when coupled into sensitive electronics, has the capability to produce widespread and long lasting disruption and damage to the critical infrastructures that underpin the fabric of U.S. society.

The effects of the pulse can be transferred directly to sensitive devices or as an electrical surge over power lines.

The generic diagram below shows an EMP to consist of three phases (E1, E2 and E3) occurring over vastly different time scales.[2] Of these, E1 is the most damaging. The others are 100 times (at minimum) less damaging than the first.

Figure 1. The three phases of an EMP threat.

EMP Graph 17 0504

The E1 component of an EMP is a very brief but powerful electromagnetic field that can induce very high voltages in electrical conductors. Damage occurs by causing voltage limits in equipment to be exceeded and happens so fast that ordinary surge protectors cannot effectively protect computers and communications equipment. However, special transient protectors fast enough to suppress this part of an EMP exist and there has been significant progress in hardening critical systems against EMP.

The E1 component is produced when gamma radiation during the first 10 nanoseconds (1 nanosecond = 1 billionth of a second) from the nuclear detonation rips electrons out of the atoms in the atmosphere. The electrons travel at relativistic speeds (more than 90 percent of the speed of light) to illuminate the area beneath the blast. The Earth’s magnetic field acts on these electrons to change the direction of electron flow to a right angle to the geomagnetic field that may cause downward electron flow to produce a very large, but quick, electromagnetic pulse over the affected area.

The E2 component is generated by scattered gamma rays and gamma emissions produced by neutron collisions from the explosion. This component lasts from about one microsecond to one second after the beginning of the electromagnetic pulse and  is similar to the electromagnetic pulse produced by lightning. Because of the similarities to lightning-caused pulses and the widespread use of lightning protection technology, the E2 pulse is generally considered to be the easiest to protect against.[3]

The E3 component of the pulse is a slow pulse, lasting tens to hundreds of seconds. It results from the nuclear detonation distorting the Earth’s magnetic field, followed by its restoration. This component is quite similar to a geomagnetic storm caused by a very severe solar flare. Like a geomagnetic storm, it can induce currents in long electrical conductors, with the potential to damage power line components.

Size Matters

This is an instance where size does matter: the larger the nuclear explosion, the larger the affected area. While technical reports and papers on EMP from nuclear detonations are mostly classified, there is a paper by D. Hafemeister of California Polytechnic Institute that provides sufficient detail to derive a simple rule of thumb on the relationship between affected distance and nuclear device yield. The paper makes some simplifying assumptions:

  • The detonation is spherically symmetric (which may not always be the case);
  • The Earth’s magnetic field is not accounted for;
  • Prompt gamma rays account for 0.3 percent of the total energy of the explosion and are emitted within the first 10 nanoseconds of detonation;
  • About 0.6 percent of the prompt gamma rays produce relativistic electrons that constitute the E1 component of the EMP; and
  • The electric field damage threshold is 15,000 volts/meter or higher in the E1 component.

Plugging in the numbers and presuming these assumptions are appropriate, the rule of thumb is surprisingly simple: D = Y, where D is the maximum damage distance expressed in kilometers and Y is the yield of the blast in kilotons. So, a 20 KT bomb detonated at optimum height would have a maximum EMP damage distance of 20 km; a 1 MT (1,000 KT) bomb would damage out to 1,000 km. The largest North Korean test to date has been estimated to be about 20 KT.


Considering the physics behind EMP and the status of North Korea’s nuclear program to date, doomsday headlines in the press regarding the North’s potential EMP threat are grossly overstated.[4] North Korea’s nuclear tests have not yet demonstrated sufficient yield to cause damage to large areas through EMP. Moreover, with only a limited arsenal, it would not make sense for the North Koreans to conduct nuclear tests simply to develop EMP weapons.


[1] John Foster, et al., Report of the Commission to Assess the Threat to the United States from Electromagnetic Pulse (EMP) Attack—Critical National Infrastructures, April 2008.

[2] Edward Savage, James Gilbert, William Radasky. The Early-Time (E1) High-Altitude Electromagnetic Pulse (HEMP) and Its Impact on the U.S. Power Grid, Meta-R-320, Prepared for Oak Ridge National Lab., Jan 2010.

[3] According to the US EMP Commission, “In general, it would not be an issue for critical infrastructure systems since they have existing protective measures for defense against occasional lightning strikes. The most significant risk is synergistic, because the E2 component follows a small fraction of a second after the first component’s insult, which has the ability to impair or destroy many protective and control features. The energy associated with the second component thus may be allowed to pass into and damage systems.”

[4] In the early 1950s, above ground nuclear tests of a size similar to what the North Koreans have demonstrated were conducted at the Nevada Test Site just 65 miles from Las Vegas. There were no reports of power outages. The casinos continued to operate. Nuclear fallout was the bigger issue.

SO….  Do we need to get “off the grid” and be ready for Urban Armageddon, when the local Power & Light Company goes down?  Should we learn how to survive without cell phones, internet, Netflix and Twitter?

As with every dark thing in this life, there is also an upside.  Should an EMP scenario take place, just imagine the hand-wringing on the Left about the “damage to the earth’s atmosphere” the blasts would cause.  The tree-huggers would go berserk!

   — SafeSpace —

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4 Responses to Is Li’l Kim Planning An EMP Attack On The US Homeland?

  1. Uriel says:

    Don’t forget NK has two known satellites in orbit currently that are mostly over the US and there was no outcry from O when launched or knowledge of purpose

  2. vonMesser says:

    Do what you can. Take what precautions you can. A generator and a small computer buried in a watertight Faraday cage might not be a bad idea. I have 6 Commodore 64’s put away. Pi$$ poor computers, but they’ll work afterwards if they are protected, and they are quite hardy little machines.

  3. Hardnox says:

    An EMP is very serious stuff. It has been discussed her at N&F many times. Our goobermint has done little to nothing to harden our grid despite warnings. An EMP doesn’t necessarily need to come from a nuke. It can occur via the Sun. It happened in the mid 1800’s when it fried the telegraph system worldwide. Most people were unaffected since no one had electricity then BUT it happened.

    Lil Kim might just be dumb enough to pull a stunt like this…. right before he gets whacked by the ChiComs.

  4. Shar says:

    Hardnox, I’m surprised the ChiComs are taking so long.