M4.8 Earthquake 16 km WNW of Apollo Bay, Australia — October 21, 2023
2023-10-21 15:11:07 UTC (2023-10-21) · approx. 1:11 AM UTC+10 local
Felt by 282 people across surrounding communities.
On October 21, 2023 at 15:11 UTC, a magnitude 4.8 shallow crustal earthquake struck 16 km WNW of Apollo Bay, Australia, at a depth of 10.0 km and coordinates -38.6944°, 143.5051°. This earthquake was detected by 38 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 535, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 4.8 releases seismic energy equivalent to roughly 239 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 1.2 km — a useful intuition for the size of the slip patch on the fault.
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 282 citizen responses to the USGS Did You Feel It? system. Each colored zone represents the average MMI from reports in that area.
Source: U.S. Geological Survey Did You Feel It?. View on USGS · submit your own report
Earthquake Details
143.5051°E
Technical Information
Common Questions
How strong was the magnitude 4.8 earthquake near Apollo Bay, Australia?
The magnitude 4.8 earthquake that struck 16 km WNW of Apollo Bay, Australia on October 21, 2023 at 15:11 UTC had a depth of 10.0 km. For context, this was a light earthquake commonly felt near the epicenter.
Where did the earthquake occur?
The earthquake epicenter was located at -38.6944°, 143.5051°, which is 16 km WNW of Apollo Bay, Australia.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.8 earthquakes can continue for several days and gradually diminish over time.
Authoritative source: USGS event page (event ID: us6000lh60). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2023, October 21, 2023). M4.8 Earthquake 16 km WNW of Apollo Bay, Australia — October 21, 2023. Retrieved July 31, 2024 from https://www.earthquaketracker.org/earthquakes/event/us6000lh60/