The state of Victoria, Australia, was shaken by its largest onshore earthquake in recorded historical past on 22 September. Some buildings have been broken however nobody was significantly harm.
The magnitude 5.9 earthquake struck at 9:15am native time, in keeping with Geoscience Australia. The epicentre was within the Alpine Nationwide Park about 120 kilometres east of Melbourne, at a shallow depth of round 10 kilometres.
Individuals in Melbourne, who’re presently in a covid-19 lockdown, reported feeling the bottom shake for 15 to twenty seconds. Tremors have been additionally felt in Canberra, simply over 300 kilometres north-east of the epicentre.
A small variety of buildings in Melbourne partially collapsed and energy outages occurred in some components of the town, however no main harm or critical accidents have been reported.
That is due to the epicentre occurring in a comparatively distant area, says Dee Ninis on the Seismology Analysis Centre in Melbourne. “We’re actually fortunate it wasn’t in a populated space,” she says
Australia experiences comparatively few earthquakes as a result of it sits in the midst of a tectonic plate, says Meghan Miller on the Australian Nationwide College in Canberra. “International locations like New Zealand, Indonesia and Japan are extra in danger as a result of they sit on plate boundaries,” she says. “However it’s a widespread fallacy that earthquakes don’t occur in Australia.”
One in every of Australia’s worst earthquakes was a magnitude 5.6 earthquake in Newcastle in New South Wales in 1989, which brought on intensive harm and killed 13 individuals.
Earthquakes happen in Australia when the tectonic plate that it sits on rubs in opposition to others and stress is slowly transmitted by the plate, ultimately resulting in a stress build-up that causes a fault inside the plate to rupture, says Phil Cummins, additionally on the Australian Nationwide College.
A magnitude 5.7 earthquake occurred in an analogous area of Victoria in 1966, suggesting it could be an space that’s susceptible to rupturing when stress progressively builds up, says Cummins.
A magnitude 4.1 aftershock was recorded quarter-hour after this morning’s earthquake, however Cummins expects there shall be no extra massive aftershocks. Australia’s Bureau of Meteorology has additionally deemed that there isn’t any tsunami threat.
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