The Seattle Fault Zone (SFZ) — a group of parallel faults collectively known as the Seattle Fault — cuts through Puget Sound. The Olympia earthquake is also known as the 2001 Nisqually earthquake. Credit: Washington State Department of Natural Resources

The Seattle Fault Zone (SFZ) — a group of parallel faults collectively known as the Seattle Fault — cuts through Puget Sound. The Olympia earthquake is also known as the 2001 Nisqually earthquake. Credit: Washington State Department of Natural Resources

The Seattle Fault Zone (SFZ) — a group of parallel faults collectively known as the Seattle Fault — cuts through Puget Sound. The Olympia earthquake is also known as the 2001 Nisqually earthquake. Credit: Washington State Department of Natural Resources

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