Japan trembled today. A 6.0 magnitude earthquake hit off Fukushima’s east coast at 11:47 AM JST (2:47 AM EST), jolting a region marked by 2011’s scars.

The shallow 40 km quake caused no instant damage or tsunami. Still, the Japan Meteorological Agency issued a “megaquake advisory” for the Nankai Trough—a fault line primed for something bigger.

No injuries surfaced, and reactors held steady. But the rare warning has people preparing, haunted by the chance of an 8.0-plus event looming.

Aftershocks are easing, yet vigilance reigns. Japan’s balancing readiness with hope it’s not a harbinger.