Scientists issued a fresh warning today: The northern Caribbean may be at a high risk for a major tsunami, based on historical records that date back to Columbus’ arrival in 1492. A tsunami in this region could affect more than 35 million people on the islands of the Greater and Lesser Antilles and along the east and Gulf coasts of the United States. The danger has been highlighted in previous research. The major source for past tsunamis in the northern Caribbean has been movement along the boundary between the North American and Caribbean tectonic plates. This fault line stretches 2,000...