Osaka Holds Earthquake Drill for 8.8 Million People

Osaka Prefecture conducted a large-scale disaster drill today, involving approximately 8.8 million residents, as part of Japan's annual Disaster Prevention Day activities.

The exercise was designed to prepare the public for a potential massive earthquake originating from the Nankai Trough, a deep undersea depression running along Japan's Pacific coast.

Seismologists have long warned that a major earthquake could occur along this fault line, prompting regular training exercises across affected regions.

At 10 a.m., mobile phones throughout Osaka Prefecture sounded simultaneously, delivering a coordinated emergency alert distributed through the "area mail" system.

Notably, the alert is designed to sound even when a device is set to silent or manner mode, ensuring that the warning reaches as many people as possible.

The message simulated the outbreak of a powerful earthquake, prompting residents to respond according to established safety protocols.

As part of the drill, participants also practised responding to a potential tsunami, a large and destructive wave that can follow major undersea earthquakes.

Instructions issued during the exercise included guidance such as "hide your body under the desk," a standard evacuation measure commonly taught in Japanese earthquake preparedness training.

Osaka Governor Hirofumi Yoshimura visited one of the drill locations to observe the initial response carried out immediately after the alert was received.

His visit allowed him to assess how quickly officials and residents reacted to the simulated emergency and to review the effectiveness of the alert system.

Authorities view these annual drills as a critical opportunity to test communication infrastructure, evaluate public readiness, and identify any weaknesses in emergency response procedures.

Given the scale of the potential Nankai Trough earthquake, which experts have identified as one of Japan's most significant disaster risks, officials continue to emphasise the importance of consistent, large-scale training.

Events like Osaka's 8.8-million-person drill are intended not only to test technology but also to reinforce public awareness, ensuring that residents know how to react instinctively if a real emergency alert is ever issued.