Three months after erupting, for what scientists say they believe was the first time in 9,370 years, the Chaitén volcano continues to threaten to coat this formerly picturesque town with volcanic ash. The aftereffects of the eruption in May destroyed half of the town of 5,000 residents. Uncertainty about if and when they will ever be able to return to the tranquil seaside life they cherished is tearing many of them apart. What to do with the displaced has become a problem for Chilean officials, and Chaitén, tiny though it may be, has alerted them to the need to better...