M5.5 Earthquake in the Fiji region — October 20, 2024
2024-10-20 12:31:07 UTC (2024-10-20) · approx. 12:31 AM UTC-12 local
On October 20, 2024 at 12:31 UTC, a magnitude 5.5 deep-focus earthquake struck in the Fiji region, at a depth of 591.3 km and coordinates -21.8931°, -179.5015°. The USGS PAGER system issued a green alert level for this event, indicating no significant casualties or damage expected. This earthquake was detected by 75 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 465, placing it among routine seismic activity.
Physical scale: An earthquake of magnitude 5.5 releases seismic energy equivalent to roughly 3 kilotons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 3.8 km — a useful intuition for the size of the slip patch on the fault.
The epicenter is located in Fiji, a region characterized by the Fiji Fracture Zone at the junction of the Pacific and Australian plates, with deep-focus seismicity from the subducted slab. View all earthquakes in Fiji.
Learn more: Magnitude scale · Aftershock sequences
ShakeMap — predicted shaking intensity
Modeled ground-motion intensity contoured on the Modified Mercalli scale (MMI). Computed by the USGS from the moment-tensor solution and regional ground-motion prediction equations.
Source: U.S. Geological Survey ShakeMap. View interactive ShakeMap on USGS
Earthquake Details
-179.5015°E
Technical Information
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Common Questions
How strong was the magnitude 5.5 earthquake in the Fiji region?
The magnitude 5.5 earthquake that struck in the Fiji region on October 20, 2024 at 12:31 UTC had a depth of 591.3 km. For context, this was a moderate earthquake that could be widely felt.
Where did the earthquake occur?
The earthquake epicenter was located at -21.8931°, -179.5015°, which is in the Fiji region. View all earthquakes in Fiji.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 5.5 earthquakes can continue for days to weeks and gradually diminish over time.
Actions
Location
Authoritative source: USGS event page (event ID: us6000nzvu). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2024, October 20, 2024). M5.5 Earthquake in the Fiji region — October 20, 2024. Retrieved December 26, 2024 from https://www.earthquaketracker.org/earthquakes/event/us6000nzvu/