The world's largest earthquakes, often called "great" earthquakes, with magnitudes larger than 9, occur along convergent plate margins, especially where one oceanic plate is being subducted beneath a continental plate. This type of configuration leads to huge regions being stressed, or "bent" into a position where regions measuring hundreds of miles (hundreds of km) in length and many tens of miles (km) in depth may suddenly slip in one earthquake event, typically releasing more energy than all the other earthquakes on the planet for many years. For example, the 2004 Sumatra earthquake released more energy than all of the other earthquakes on the planet in the past 30 years. In this section some of these huge convergent margin earthquakes are described to give an understanding of the power of these events in shaping the Earth's surface. In the United States Alaska and the Pacific Northwest are the regions most at-risk for experiencing future convergent margin earthquakes.
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Preparing for Armageddon, Natural Disasters, Nuclear Strikes, the Zombie Apocalypse, and Every Other Threat to Human Life on Earth. Most of us have thought about how we would handle various types of scenarios that could signal the end of the world. There are plenty of movies on the subject, psychological papers, and even survivalists that are part of reality TV shows. Perhaps you have had dreams about being one of the few left and what you would do in order to survive.