Less than two years after the Unzen catastrophe another group of volcano watchers, led by Stanley Williams of the University of Arizona, descended into the rim of an active volcano called Galeras in Colombia.

云仙岳灾难发生后不到两年，在亚利桑那大学的斯坦利·威廉斯的率领之下，另一组火山观测员走进哥伦比亚一座名叫加莱拉斯火山的活火山口。