Taiwan's strongest earthquake in 25 years kills seven, tsunami ...

Authorities say seven people, including three hikers, have been killed as a result of a magnitude-7.5 earthquake that struck the east coast of Taiwan on Wednesday morning.

Seventy-seven people are still trapped by debris, authorities said, with 60 of those caught in a tunnel just north of the city of Hualien.

The deaths occurred in Hualien County, close to the earthquake's epicentre.

The hikers were killed by a rockslide in Taroko National Park and another person died in a highway tunnel.

Rescue workers search for survivors in the ruins of a building in New Taipei City.(AFP: Central News Agency)

The Taiwanese government said about 736 people were injured in the quake.

Japan and the Philippines have now lifted all tsunami warnings and advisories triggered by the quake.

The earthquake hit at 7:58am (local time) at a depth of 15.5 kilometres, according to Taiwan's Central Weather Administration.

Reuters news agency is reporting that Japan's Meteorological Agency has revised up the earthquake from a magnitude 7.5 to 7.7. 

Earlier, Reuters reported the earthquake had a magnitude of 7.2. 

Meanwhile, the United States Geological Survey were reporting it was a 7.5-magnitude earthquake before downgrading it to a 7.4. 

Taiwan's earthquake monitoring agency put it at 7.2. 

The quake knocked out power in several parts of Taiwan's capital Taipei, affecting 87,000 homes. 

At least 26 buildings have collapsed — more than half in Hualien — with 22 people rescued from one severe case and only one missing, the fire department said.  

The Central Weather Agency said it was the most powerful earthquake the island has experienced in 25 years, and numerous powerful aftershocks have been recorded.

Taiwan's air force said six F-16 fighter jets had been slightly damaged at a major base in the city from which jets are often scrambled to see off incursions by China's air force, but it expected the aircraft to return to service very soon.

Foreign Minister Penny Wong shared her condolences on X and said she didn't believe any Australians were harmed. 

"DFAT officials in Taipei and Tokyo are working with authorities but at this stage aren't aware of any Australians affected."

Despite the quake striking at the height of the morning rush, the initial panic faded quickly on the island, which is regularly rocked by temblors and prepares residents through drills at schools and notices issued via public media and mobile phones.

Firefighters work at the site where a building collapsed following the earthquake in Hualien, Taiwan.(Reuters: National Fire Agency)

“Earthquakes are a common occurrence, and I’ve grown accustomed to them," Taipei resident Hsien-hsuen Keng told AP. 

But today she said was the first time she was was "scared to tears" by an earthquake.

”I was awakened by the earthquake.

"I had never felt such intense shaking before.”

She said her fifth-floor apartment shook so hard that "apart from earthquake drills in elementary school, this was the first time I had experienced such a situation".

The Japanese Meteorological Agency said the earthquake struck at a very shallow depth, making the impact worse.

The Japan Meteorological Agency said a tsunami wave of 30 centimetres was detected on the coast of Yonaguni island, about 15 minutes after the quake struck.

A local Taiwan television station captured footage of damaged buildings in Hualien county. (Supplied: TVBS World Taiwan)

Smaller waves were measured in Ishigaki and Miyako islands.

Japan sent military aircraft to gather information about the impact around the Okinawa region.

Flights were suspended at Japan's main airport in Okinawa from 9:25am (local time) as a precautionary measure, a transport ministry official stationed at Naha Airport said.

The quake was felt in Fuzhou, Xiamen, Quanzhou and Ningde in China's Fujian province, according to Chinese state media.