A magnitude 6.0 earthquake struck the coast of the Ibaraki prefecture in Japan, with shaking felt by some attending the Olympic Games in Tokyo.
The earthquake hit about 5:30 a.m. local time on Wednesday, according to reports from the Japan Meteorological Agency, which monitors seismic activity.
Journalists in Japan said the earthquake lasted between 20 seconds to 3 minutes. Each reported mild rumbling.
Japan is no stranger to earthquakes, as the country rests over three converging tectonic plates. When just one of those tectonic plates shifts, an earthquake can occur.
Japanese officials specifically created Tokyo's Olympic venues to withstand earthquakes and natural disasters. According to Firstpost, the Ariake volleyball arena contains "shock-absorbing giant rubber cushions" to curtail shaking while the Olympic Village is protected by sea walls that can protect against tsunamis reaching 6.5 feet.
Several volunteers at the games have set out to retell their experiences from a 2011 Japanese earthquake and tsunami that killed at least 18,000 people. Some have handed out business cards with their tsunami stories, while others set up storytelling centers near bus stations to share their experiences.