AP Photo

I was sitting barefoot on my bed, catching up on ethnographic field notes, when the earthquake hit. As a child of the San Francisco area, I was underwhelmed at first. “An earthquake. This is unexpected," I thought. But then the shaking grew stronger. I had never felt such a loss of control, not only of my body but also of my surroundings, as though the world that contained me were being crumpled.

I braced myself in a doorway between the hallway and the kitchen, trying to hold on to the frame, and then a cloud of darkness and cement dust swallowed everything as the house collapsed. I was surprised to die in this way, but not afraid. And then I was surprised not to be dead after all. I was trapped, neither lying down nor sitting, with my left arm crushed between the planks of...