Japan: Magnitude-5.5 offshore earthquake occurs east of Honshu April 4

Event

A magnitude-5.5 offshore earthquake occurred east of Honshu Island at around 19:29 April 4. The epicenter was about 61 km (39 miles) east of Namie. The tremor occurred at a depth of about 37 km (23 miles), and moderate shaking was probably felt in Fukushima and Myago prefectures, as well as light shaking throughout other parts of eastern and northern Honshu Island. 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

Out of an abundance of caution, consider vacating multistory buildings where shaking occurred until authorities confirm their structural integrity. Monitor and plan for aftershocks.