A powerful earthquake with a magnitude of 7.4—the strongest earthquake in 25 years to hit the island—followed by a smaller quake with a magnitude of 6.5 struck off Taiwan’s eastern coast on Wednesday, according to the US Geological Survey, prompting tsunami warnings in southern Japan.

The first quake, with a magnitude of 7.4, struck at 7:58pm ET (7:58am local time), had an epicentre located about 18 kilometres (11 miles) south of the city of Hualien and shook buildings in the capital, Taipei.

It’s the biggest seismic event by magnitude since 1999, when the so-called 921 quake hit the island and killed more than 2,000 people, Taiwan’s weather authorities said during a press conference. There have been several aftershocks clustered on the island’s east coast.

The second quake, with a magnitude of 6.5, hit 13 minutes later at 8:11 ET and was located at almost the exact same spot as the first one; its epicentre was about 11 kilometres northeast of Hualien City.

Hualien announced plans to shut down offices and schools on Wednesday in the wake of the event. The island’s power provider, meanwhile, said nuclear power plant operations remain normal and power distribution in Taiwan has stabilised.

People on the Chinese social platform Weibo said they felt the quake all across China, including in Shanghai and Guangdong.

Tsunami waves reaching 1- to 3-meters were possible along some coasts of China and Taiwan, the Pacific Tsunami Warning Centre said. A tsunami warning was also issued for southwestern Japan’s Okinawa prefecture after the region was rocked by the quake.

Local residents were urged to evacuate from an expected tsunami of as high as 3 metres, according to the Japan Meteorological Agency.

Clips posted on X showed local damage and landslides in the aftermath of the strong quake.

Others reported that multiple buildings had collapsed in Taiwan in the aftermath of the quake.

Turning to markets, the USDTWD is trading at 32.055/075, near Tuesday’s levels. Local equities are down 0.53%. New Taipei City, a satellite city outside of Taipei, has declared the closure of schools and offices. Local equities and FX market remains will continue to operate.