Loading the spring: How pressure is building for Cascadia earthquake

"When you think about the energy involved when compressing all of the Olympic Peninsula and all of Puget Sound, that's a lot of energy," said Tim Melbourne, director of the Pacific Northwest Geodetic Array (PANGA).

If you're sitting just about anywhere in Washington state, you are on ground that is moving. The further west you go, the more it moves. The state is being compressed spring as the ocean floor, which is also moving, puts pressure on the land, which is moving to the northeast.

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