The area has been rocked by violent earthquakes in the past, including a massive 8.8 magnitude quake back in February. That event killed at least 500 people and triggered tsunami warnings.
Wednesday’s practice run involved more than 160,000 residents and was overseen by close to a thousand police officers,firefighters and other emergency workers.
The exercise was designed to teach residents what to do in the case of a 8.1 magnitude or higher earthquake. Schools, hospitals and public buildings took part in the exercise.
The whole event took about 45 minutes.
The hope is that if a major earthquake hits the region, 70,000 people will be able to evacuate the city within fifteen minutes, even if emergency systems are knocked off line.