Australia Earthquake: Gnowangerup swarm keeps rattling WA as 4.4 tremor shakes southeast
australia earthquake activity is in sharp focus as a swarm of more than 100 small quakes has shaken Gnowangerup, Western Australia since January while a separate magnitude 4. 4 tremor near Boorowa, New South Wales was recorded at 7. 09pm ET. Geoscience Australia and seismologist Dr Jonathan Bathgate say the Gnowangerup sequence has produced mostly magnitude twos and threes, with a 3. 8 quake on March 2 the largest in that cluster so far. Residents from Katanning to Canberra reported feeling tremors and local officials warn the Gnowangerup swarm could continue for months, though large damaging events are seen as unlikely but not impossible.
Australia Earthquake: Gnowangerup swarm — what the science shows
Gnowangerup sits in a known seismic area identified in the South West seismic zone and has seen more than 100 low-level earthquakes since the start of the year. Dr Jonathan Bathgate, a senior seismologist at Geoscience Australia, said the sequence looks like an earthquake swarm rather than the classic foreshock–main shock–aftershock pattern. “It’s just a lot of moderate or small to moderate-sized earthquakes with no real main shock in amongst that, and that’s kind of what we’re seeing here, ” he said, noting the largest in the sequence was a magnitude 3. 8 on March 2 that fell within an approximate 10km cluster radius.
Dr Bathgate described how the continent’s tectonic motion redirects stress within crustal rocks and that pre-existing fault lines can host repeated small events. “It’s really not something we understand enough to say how long it will last for, but we have seen them last for a couple of years and and then sort of just die off slowly, ” he said. He added it was unlikely the swarm would lead to a damaging earthquake but conceded that possibility could not be ruled out, noting there was a magnitude 4. 5–5 event in the area in 2023.
4. 4 tremor near Boorowa felt across Canberra and region
Separately, Geoscience Australia recorded a magnitude 4. 4 earthquake with an epicentre near Boorowa, New South Wales at 7. 09pm ET. Bonner resident Kyle Mackey-Laws described the event: “We were sitting on the couch and the house started shaking, the windows rattled, and it sounded like a massive truck was driving past our house slowly. ” The tremor was strongly felt across Canberra and surrounding towns; chandeliers shook at the National Press Club in Barton while University of Canberra vice-chancellor Bill Shorten was delivering a lecture. The agency received thousands of felt reports related to the event by about 8. 15pm ET.
In Gnowangerup itself, local business owner Ron Bett of Gnowangerup 24/7 Fuel Bowsers said small swarms are not unusual. “It’s not uncommon for us and you get a bit of rattling in your house, ” he said, adding that with the recent events he did not know of anyone sustaining damage and noting stronger quakes have occurred in the past that caused significant property loss for some residents.
What’s next: monitoring, community advice and likely outlook
Geoscience Australia and Dr Bathgate are continuing to monitor the Gnowangerup cluster closely and have warned residents to brace for ongoing shaking over the coming months. Seismologists note the current behaviour — many magnitude twos and threes — releases energy through numerous small events, which can reduce stored stress, but historical activity in the area shows larger events remain possible. Emergency services have not reported widespread requests for assistance tied to the recent incidents.
For communities watching seismic activity, official monitoring updates and local preparedness remain the immediate priorities as australia earthquake patterns evolve; scientists say the sequence could persist for months while they track any change in magnitude or frequency.
