Iron oxide mine with a vertical crack (to the upper left of the rock hammer) caused by a megaquake approximately 3,800 years ago. Credit: Gabriel Easton, Universidad de Chile

Iron oxide mine with a vertical crack (to the upper left of the rock hammer) caused by a megaquake approximately 3,800 years ago. Credit: Gabriel Easton, Universidad de Chile

Iron oxide mine with a vertical crack (to the upper left of the rock hammer) caused by a megaquake approximately 3,800 years ago. Credit: Gabriel Easton, Universidad de Chile

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