A magnitude 3.0 earthquake aftershock shook south-eastern Victoria on Saturday afternoon, three weeks after a stronger late-night tremor near Korumburra sent thousands scrambling from bed and revived long-running anxiety about seismic risk in the Gippsland Basin.
Geoscience Australia said the quake struck just after 2pm at a shallow depth of five kilometres, with an epicentre at Kardella South, about 135 kilometres south-east of Melbourne. The agency logged more than 200 felt reports — far fewer than the October 3 main event — and police and local councils reported no injuries or structural damage.
Aftershocks keep the conversation going
Monash University earthquake geologist Dee Ninis told ABC News the Saturday tremor fits the pattern of aftershock sequences that can continue for days or weeks after a larger shock. "Often there's hundreds of aftershocks after an earthquake and the majority are usually too small to be felt," she said, noting the Gippsland Basin sees heightened activity compared with much of the continent.
Ninis pointed to a magnitude 4.7 event in 2009 that was followed by a similar-sized quake about two weeks later, and a magnitude 4.4 tremor in 2011, as reminders that the region's geology can produce repeating clusters rather than one-off surprises.
Communities still on alert
Respondents to Geoscience Australia's online survey reported shaking between 2pm and 3:30pm from towns close to the epicentre through the Latrobe Valley and into suburban Melbourne. South Gippsland Shire mayor Nathan Hersey said he did not feel this aftershock personally but that residents around Arawata — near the earlier epicentre — were still talking about quakes weeks later.
Emergency Management Victoria has not issued fresh warnings beyond standard advice to drop, cover, and hold during shaking. Insurers and building inspectors in Korumburra said call volumes spiked after the October 3 event; Saturday's lighter tremor is unlikely to trigger a similar surge, but it keeps aftershock preparedness on school and business checklists as spring continues.
What seismologists watch next
Geoscience Australia will continue publishing automated detections and encouraging felt reports to refine location and depth estimates. Ninis said only sustained increases in magnitude or frequency would suggest something beyond a normal aftershock tail; for now, the Saturday jolt reads as the basin settling after early October's louder wake-up call. Residents who felt strong shaking are still urged to submit reports through the agency's website to help map how waves travel across Gippsland's coal-country towns and into Melbourne's outer suburbs.