Terrorism Preparedness Manual

ELECTROMAGNETIC PULSE
(EMP) AND GRID SECURITY
• An electromagnetic pulse (EMP) could result naturally, or be manmade through both nuclear
and nonnuclear weapons creating a high-density electrical field. Nonnuclear EMP weapons,
more commonly known as radio frequency weapons, can generate an EMP having very short
wavelengths that could damage or destroy even small electronic devices in a localized area,
usually out to a range of 1 kilometer or less.
• An EMP acts like a stroke of lightning but is stronger, faster, and shorter. An EMP can
seriously damage electronic devices connected to power sources or antennas. This includes
communication systems, computers, electrical appliances, and automobile or aircraft ignition
systems and possibly the electric grid. The electric grid is susceptible to cyber-attack by
computer viruses and hacking. The EMP Commission recommended that by protecting the
electric grid and other critical infrastructures from nuclear EMP, all lesser threats could be
mitigated, including cyber-attacks, sabotage, non-nuclear EMP, natural EMP, and severe
weather.
• While some officials hold that the threats of an EMP, hard attack, or cyber attack on the
electric grid are not imminent threats at this time, others contend the possibility is more
likely. In either case being aware and knowledgeable of the possibilities is important.
• See Emergency Kit on page 22.
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