It is a shocking event that reminds people of some more basic risks that may threaten the economies of the densely-populated and seismically vulnerable Japanese archipelago.

这是一个触目惊心的事例，提醒人们，还有一些更为基本的风险，可能威胁到人口稠密、易受地震冲击的日本列岛上的经济活动。