Japan: Magnitude-5.6 offshore earthquake occurs west of the Ryukyu Islands at around 20:33 March 17

Event

A magnitude-5.6 offshore earthquake occurred in the East China Sea west of Okinawa Island at around 20:33 March 17. The epicenter was about 145 km (90 miles) west-northwest of Naha. The tremor occurred at a depth of about 10 km (6 miles), and light shaking was probably felt across Okinawa Island and other central parts of the Ryukyu Islands. There have been no initial reports of damage or casualties as a result of the earthquake; however, significant damage is unlikely. It could take several hours until authorities can conduct comprehensive damage assessments, especially in remote areas. Light aftershocks are likely over the coming days. The event has not prompted any tsunami advisories.

Officials may temporarily shut down transportation infrastructure in the tremor zone to check for damage. Minor disruptions could occur during shutdowns, but service will likely resume quickly if no damage is found. Utility outages are possible, particularly near the earthquake's epicenter.

Advice

Plan accordingly for aftershocks. Consider vacating multistory buildings if operating in affected areas until authorities confirm their structural integrity.