Horizontal extension, or stretching, of Earth’s crust produces inclined “normal” faults in western and central Utah that move more vertically compared to the horizontal motion of California’s San Andreas strike-slip fault. Credit: “Putting Down Roots in Earthquake Country,” Utah Geological Survey

Horizontal extension, or stretching, of Earth’s crust produces inclined “normal” faults in western and central Utah that move more vertically compared to the horizontal motion of California’s San Andreas strike-slip fault. Credit: “Putting Down Roots in Earthquake Country,” Utah Geological Survey

Horizontal extension, or stretching, of Earth’s crust produces inclined “normal” faults in western and central Utah that move more vertically compared to the horizontal motion of California’s San Andreas strike-slip fault. Credit: “Putting Down Roots in Earthquake Country,” Utah Geological Survey

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