On May 10th, 2003, the Anatahan Volcano in the Northern Mariana Islands erupted for the first time in historical times. By a lucky coincidence, a group of scientists engaged in investigations within the MARGINS Program, who had recently visited the island, were still cruising within miles of the island and witnessed the eruption. A team of MARGINS volcanologists visited Anatahan to take samples and deploy instruments while the eruption was still ongoing. Information about the eruption and the MARGINS work are posted on these web pages.