Experts who dismissed notions that far-away quakes could be linked are beginning to think again after huge tremors rocked Samoa and Indonesia on the same day, followed by another major convulsion in Vanuatu.

Some 184 people died in the terrifying tsunami which smashed Samoa, American Samoa and Tonga on September 30, while thousands are feared dead after parts of Indonesia's Padang city were reduced to rubble just hours later.

On Thursday, thousands of panicked people fled the coast as a rapid succession of large quakes off Vanuatu set off a tsunami warning for much of the South Pacific.

The "remarkable" sequence has prompted veteran earthquake-watcher Gary Gibson to tear up his theory it was all down to chance and search for a possible connection.

"I can no longer keep using the response it's all a big coincidence, can I?" Gibson, senior seismologist at Environmental Systems and Services consulting group, told AFP.

"But what would the (link) mechanism be? Nobody has come up with a good story."

University of Queensland's Huilin Xing also challenged accepted science by proposing a possible link between the Samoan and Indonesian earthquakes -- 6,000 miles (9,660 kilometres) apart.

Xing said the fast-moving Australian tectonic plate may have set off one quake, and then the other.

"From the observations, there were similar correlations of the quakes in the different places," Xing said.

"For two great earthquakes to occur within hours in such a way, it is abnormal."

Thursday's 7.6, 7.8 and 7.3 Vanuatu earthquakes also came just minutes after another large tremor shook the Philippines.

"It's remarkable. I've been working on this for 30 years and never seen it before," said Gibson.

"Many times it's chance but when you get this many large earthquakes on the Australian plate boundary it's stretching the concept of just coincidence. But nobody I know has published a link that will stand up in all cases.

"There's no mechanism to describe why it's happening that anybody's thought of. I personally think there may well be something else and I'm continuing to look for it."

Kevin McCue, president of the Australian Earthquake Engineering Society, rejected ideas of any connection between the Pacific and Indonesian quakes, but said the tremors in Samoa and Vanuatu had a historical precursor.

McCue said in 1917 a major earthquake rocked Samoa, followed three years later by another of similar size off Vanuatu, with both going off close to the recent quakes' epicentres.

But he said the high activity in different areas was simply part of the random nature of earthquakes.

"It's just the nature of the beast -- you have a cluster of events then you wait months without one," he said.

"(But) I don't deny that I don't know something. It is possible there's something more. We don't know what's happening down there, really."

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