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FEATURED AUSTRALIA GEOSCIENCE REPORT: Melbourne #Earthquake Stronger Than First Revised it to Magnitude Four

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Ace Press News From Cutting Room Floor: Published: May.30: 2023:

#AceNewsDesk – The earthquake that hit Melbourne’s north-west fringe on Sunday night was stronger than originally thought.

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Geoscience Australia said today that it had upgraded the quake from magnitute-3.8 to magnitude-4, and also revealed there was an aftershock of magnitude-2.6 just two minutes after the main jolt.

The needle rests in the middle of the black lines indicating the strength of the quake on a red and white graph
A reading from the Sunbury earthquake taken at the Seismology Research Centre.(ABC News: Patrick Rocca)none

More than 26,000 people in an area stretching from Albury in the state’s north down to Hobart have now reported they felt the effects of the quake at the time.

The earthquake hit at 11.41pm on Sunday, as most Melburnians slept, and was centred on the outer suburb of Sunbury.

Although it was not particularly strong, the comparatively shallow depth at which it occurred meant it was felt more widely than would be normal.

While most Australian earthquakes are generated around 10 kilometres underground, the Sunbury quake was far shallower, around 3 kilometres below the surface.

Geoscience Australia says nationally, there is an earthquake above magnitude-5 every one to two years.

The needle rests in the middle of the black lines indicating the strength of the quake on a red and white graph
A reading from the Sunbury earthquake taken at the Seismology Research Centre.(ABC News: Patrick Rocca)none

Potentially damaging earthquakes of magnitude-6.0 or above happen about every 10 years.

Despite the upgrading of the Sunbury earthquake, it still lags significantly behind the 2021 quake centred in the small Victorian town of Rawson.

The Rawson earthquake was measured at magnitude-5.9 and felt from Sydney to Hobart, west to Adelaide and, of course, in Melbourne. More than 43,000 “felt reports” were made in the aftermath of the Rawson quake.

On average, Australia experiences around 100 earthquakes of magnitude-3 or larger each year, according to Geoscience Australia.

Earthquakes above magnitude-5, such as the destructive magnitude-5.4 earthquake in Newcastle in 1989, occur approximately every one to two years.

ORIGINAL REPORT: Earthquake reported at Sunbury near Melbourne, impact felt in city’s CBD: Posted 18h ago18 hours agoSun 28 May 2023 at 3:07pm, updated 5h ago5 hours agoMon 29 May 2023 at 3:41am

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The needle rests in the middle of the black lines indicating the strength of the quake on a red and white graph
A reading from the Sunbury earthquake taken at the Seismology Research Centre.(ABC News: Patrick Rocca)none

A magnitude-3.8 earthquake in Sunbury, west of Melbourne, has been felt across the region but there have been no reports of damage………….Melbourne residents reported buildings shaking on Sunday evening about 11:41pm.

Although Sunbury is 40 kilometres north-west of the city, the earthquake’s impact was felt in Melbourne’s CBD.

The quake, which occurred at a depth of 3 kilometres, lasted only a few seconds, according to residents.

More than 20,000 people in Sunbury had reported feeling the earthquake to Geoscience Australia by about 1:30am.

The tremor was also felt as far north as Bendigo and as south as Hobart.

Victorian SES chief operations officer Tim Wiebusch said many people reported feeling the tremor, but there were no reports of damage to buildings or injuries.

The size that we’re talking about at a 3.8 it’s typically, definitely felt indoors by many and also by those outdoors,” he told ABC Radio Melbourne.

“You would hear that sudden rush like a train noise that some people experience but it has been widely felt all the way from Geelong to Ballarat, out to Seymour, down on the Mornington Peninsula and as north as Murchison.”

Geoscience Australia seismologist Hugh Glanville said the tremor would have been widely felt but would have been unlikely to damage infrastructure.

“While it’s stronger shaking that travels a decent distance throughout the region, we don’t expect damage from an earthquake of that size,” he said.

“You don’t tend to get minor damage until around magnitude 4.5 where you’ll get things like plaster cracking and things rattling on shelves.” 

He said more tremors were possible over the next couple of days.

Adam Pascale, chief scientist at the Seismology Research Centre (SRC), said the earthquake may have been the largest in over 100 years within the Melbourne metropolitan area.

“We could expect aftershocks from an earthquake of this size, it’s not guaranteed of course, sometimes you just get a single earthquake and no aftershocks associated,” he said.

“The last earthquake above a magnitude 4 in the metro area was in 1902,” Mr Pascale said in a video posted on Twitter.

Dee Ninis from the SRC said people close to the epicentre reported hearing an explosion.

“This looks to have been a shallow event — the seismic energy produced by such earthquakes can reach the surface to transform into sound waves, making a ‘boom’,” she tweeted.Loading…

Melbourne was rattled by an earthquake in September 2021, which caused some damage, including on the famous Chapel Street shopping strip…………….At magnitude 5.9, it was the largest earthquake ever recorded in Victoria, but its epicentre was at Woods Point, about 130 kilometres east of Melbourne.

The 2021 tremor was also felt in parts of New South Wales, South Australia, Tasmania and the ACT.

On average, Australia experiences around 100 earthquakes of magnitude 3 or larger each year, according to Geoscience Australia.

Earthquakes above magnitude 5, such as the destructive magnitude-5.4 earthquake in Newcastle in 1989, occur approximately every one to two years.

GEOSCIENCE NEWS REPORT
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ABC NEWS REPORT

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The needle rests in the middle of the black lines indicating the strength of the quake on a red and white graph
A reading from the Sunbury earthquake taken at the Seismology Research Centre.(ABC News: Patrick Rocca)none
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