US News: Earthquake near Broome may have released '100 times more energy' than Newcastle tremor - PressFrom - United Kingdom
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US NewsEarthquake near Broome may have released '100 times more energy' than Newcastle tremor

17:25  15 july  2019
17:25  15 july  2019 Source:   abc.net.au

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Earth science expert Claire MacGregor said the two cities Sydney and Melbourne sit near fault lines Shoppers in Broome had to flee the stores as the powerful earthquake threw products off the 'To put that into perspective, it released about 100 times more energy than the earthquake in Newcastle .'

Most important Earthquake Data Broome - Shook for about a minute maybe more . Nothing was damaged but we had to grab the TV to stop it from falling. Broome - Lasted quite some time - maybe a minute. House rattled a lot, but nothing broken.

Earthquake near Broome may have released '100 times more energy' than Newcastle tremor © Provided by Australian Broadcasting Corporation The 1989 Newcastle quake killed 13 people, injured more than 160 and damaged 50,000 buildings. (Newcastle Region Library Collection)

The 6.6 magnitude earthquake that rattled Broome on the weekend was on par with the largest ever recorded in Australia and was felt along several thousand kilometres of coastline from Darwin down to Perth and around to Esperance.

While it certainly gave residents a scare, damage appears to have been limited to some roof panels and stock that tumbled from supermarket shelves.

Geosciences Australia earthquake seismologist Trevor Allen said a quake of that power could have been devastating, but the country dodged a bullet.

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Authorities say undersea tremor located offshore between Port Hedland and Broome poses no tsunami threat to Australian mainland.

An earthquake (also known as a quake , tremor or temblor) is the shaking of the surface of the Earth , resulting from the sudden release of energy in the Earth 's lithosphere that creates seismic waves.

"We were really fortunate that this earthquake occurred offshore and well away from any main population centres," Mr Allen said.

"People often don't think of earthquakes being a major threat in Australia, for the most part Australian communities are more aware of fires and floods.

"Earthquakes are rarer events but when they do occur, they can have higher consequences."

100 times stronger than devastating Newcastle quake

In December 1989, the NSW harbour city of Newcastle was struck by a magnitude 5.6 earthquake.

It killed 13 people, injured more than 160 and damaged 50,000 buildings, making it one of Australia's worst natural disasters.

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Australia: Strongest earthquake in more than 30 years hits country - is it safe to travel? The earthquake hit the west of Broome in Western Australia, according to the United States Geological It is likely aftershocks will decrease in size and happen further apart as time passes, Phil Cummins, a

In other words a magnitude 9.0 earthquake releases 1000 times more energy than a magnitude 7.0. However, on a logarithmic scale, even a step up However, an even more important difference than the magnitude of the earthquake is the preparation and resilience of the society affected by the quake .

Earthquake near Broome may have released '100 times more energy' than Newcastle tremor © Erin Parke/ABC News A Cable Beach restaurant felt the effects of the earthquake off Broome but overall damage was limited.

Mr Allen said despite Sunday's quake being significantly stronger, its depth and location about 200 kilometres off the coast meant it had far less of an impact.

"This earthquake that we saw yesterday probably released about 100 times more energy than the 1989 Newcastle earthquake," he said.

"It released a lot of energy but the really extreme, high-intensity shaking would have occurred right near the epicentre of the earthquake.

"And because it was so far offshore, the damage that we did see was minimised."

Why no tsunami threat? It's all in the 'strike slip'

Almost immediately after the quake struck on Sunday afternoon, Geosciences Australia ruled out any threat of a tsunami.

Earthquake geologist from the University of Melbourne, Tamarah King, said the nature of the tremor meant that risk could be eliminated quickly.

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The 1989 Newcastle earthquake occurred in Newcastle , New South Wales on Thursday, 28 December. The shock measured 5.6 on the Richter magnitude scale and was one of Australia's most

Sergeant Neil Gordon of the Broome police department said the quake rattled the city for more than a minute. The building here was shaking for about a The national broadcaster ABC said there were some reports of minor damage from the quake , and no injuries. Australian media said the tremor was

Earthquake near Broome may have released '100 times more energy' than Newcastle tremor © Newcastle Region Library Collection The Newcastle earthquake was one of Australia's worst natural disasters.

"The type of earthquake it was doesn't really cause tsunamis," Ms King said.

"A tsunami threat from earthquakes comes from when an earthquake breaks the surface of the ocean and physically pushes the water up.

"This particular earthquake is a 'strike slip' earthquake, which means instead of pushing up, the fault slides side to side.

"There's no upwards movement to offset the water."

Two quakes in just hours — is there a link?

A few hours after Broome's earthquake, news emerged of another major seismic event off Indonesia.

A 7.3 magnitude earthquake had hit the remote Maluku Islands, leaving about 160 houses collapsed and a woman reportedly killed.

Gallery: The most devastating earthquakes of all time (StarsInsider)

Both Mr Allen and Ms King said the timing was coincidental and the two earthquakes did not appear to have been linked in any way.

"It's highly unlikely that the event off the West Australian coast triggered the event off Indonesia," Mr Allen said.

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It was the most powerful earthquake ever recorded in Japan, and the fourth most powerful earthquake in the world since modern record-keeping began in 1900.[12][32][33] The earthquake triggered powerful tsunami waves that may have reached heights of up to 40.5 metres (133 ft) in

And if a magnitude 9.0 earthquake were to hit southern California someday, it would be 707 times more powerful than the magnitude 7.1 earthquake that we just witnessed. Hopefully such a quake is still a long way off, but we have witnessed renewed shaking in the region within the last 24 hours.

"Anything is possible but it's highly unlikely."

Are we experiencing more quakes than usual?

The Broome and Maluku Islands quakes came three weeks after a magnitude 7.2 earthquake struck in the Banda Sea, east of Indonesia and north of Darwin.

It caused staff to be evacuated from buildings in Darwin's CBD as a precaution, with tremors felt by Territorians in Maningrida and Katherine, more than 300 kilometres away.

The recent seismic activity has prompted questions about whether we are experiencing more earthquakes than usual in the waters around northern Australia.

In short, no, the experts said.

"The area off the north-west coast of Australia is one of Australia's most seismically active areas," Mr Allen said.

"So it's not really a surprise that these large earthquakes can happen in that area.

"It's just that we happen to be in one of those periods at the moment where there have been quite a few larger events."

Ms King said people had heightened awareness of earthquakes once they had experienced one.

"People are expecting them at the moment," she said.

"The fact that people felt them, and they were reported on, makes it seem like there's more seismicity currently. But it's just a coincidence."

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