Japan's First Megaquake Advisory: Understanding the Nankai Trough Threat

Japan has issued its first-ever advisory on the heightened risk of a megaquake following a significant magnitude 7.1 tremor. Experts warn of the devastating potential of a Nankai Trough quake and tsunami, which could cause massive casualties and economic damage. Historical data and recent research underscore the urgency of preparedness.

Japan has issued its first-ever advisory on heightened risks of a megaquake after a recent magnitude 7.1 tremor struck near the Nankai Trough along the Pacific coast. This advisory accounts for the increased likelihood of a massive earthquake and tsunami disaster, potentially jeopardizing hundreds of thousands of lives.

The Japan Meteorological Agency's advisory notes that the probability of a major earthquake following a magnitude 7 quake is substantially high. Past estimates suggest that a future Nankai Trough megaquake could reach a magnitude of 9.1, causing catastrophic effects. Residents are being urged to review evacuation procedures and remain vigilant.

The Nankai Trough, located off Japan's southwest Pacific coast, is significant due to its potential for producing megaquakes. Historical records show multiple instances of large quakes and tsunamis since 684. The last major event occurred in 1946, with significant loss of life and property. Economists predict an event of this magnitude could inflict economic damages totaling around 220 trillion yen, disrupting infrastructure and key industrial operations.

(With inputs from agencies.)