Indonesia: A magnitude-5.5 offshore earthquake occurs off the west coast of Sumatra Islands at around 15:39 June 20

Event

A magnitude-5.5 earthquake occurred in the Indian Ocean off the west coast of Sumatra Island, close to Nias Island, at around 15:39 June 20. The epicenter was about 159 km (99 miles) northwest of Tuapejat, West Sumatra Province. The tremor occurred at a depth of about 22 km (14 miles), and moderate-to-light shaking was probably felt in parts of the island regions of West and North Sumatra provinces, as well as light-to-weak shaking throughout parts of central and northern mainland West Sumatra and southwestern mainland North Sumatra provinces. 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.