Two homes after the magnitude-6.0 earthquake in Napa, Calif., in 2014. The one that is not retrofitted was too structurally damaged to be immediately habitable (left) while the retrofitted home next door was structurally sound (right). Credit: California Earthquake Authority

Two homes after the magnitude-6.0 earthquake in Napa, Calif., in 2014. The one that is not retrofitted was too structurally damaged to be immediately habitable (left) while the retrofitted home next door was structurally sound (right). Credit: California Earthquake Authority

Two homes after the magnitude-6.0 earthquake in Napa, Calif., in 2014. The one that is not retrofitted was too structurally damaged to be immediately habitable (left) while the retrofitted home next door was structurally sound (right). Credit: California Earthquake Authority

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