Future Prediction

2014-2060

At some point during this period, the United States is struck by the most devastating earthquake in its history
The Cascadia Subduction Zone is a 600 mile-long converging plate boundary stretching from northern California to southern British Columbia. The fault causes a major earthquake about once every 300 years. Compared to other fault lines, this is an unusually long return time – resulting in greater stress build-up and stronger subsequent earthquakes. The last major event (a so-called megathrust quake) took place in 1700 and was estimated to have had a magnitude of at least 9.0.

Since then, the movement of the two plates has steadily built up pressure. In the first half of the 21st century, the fault exceeds the vast majority of previous time intervals in recorded history.* During this time, the plates finally slip, resulting in the single most devastating earthquake in United States history.*** It is centred on the state of Oregon, with a duration of several minutes, inflicting deadly damage to major population centres like Portland, Seattle, Olympia and even Vancouver and Victoria. Of course, many structures have been retrofitted and are able to withstand the earthquake, along with the majority of newer buildings. However, years of economic trouble, as well as a general inexperience of large earthquakes, have left many structures vulnerable.

Bridges and highways collapse, while the ground in the Seattle bay area liquefies, dragging buildings underwater. Broken gas mains and power lines spark many fires. The quake generates massive tsunamis,* which inundate coastal communities from California to Alaska. These giant waves are sent racing across the Pacific, causing damage as far away as Hawaii and Japan. Millions are left without power, while emergency responders struggle to adapt to the scale of the disaster. The death toll quickly reaches into the thousands, while the financial cost exceeds $100 billion. Along with the similarly devastating southern California earthquake, this disaster pushes much of the American west coast toward financial ruin.