Reviewed by USGS42y ago
M4.7 earthquake south of the Fiji Islands
Friday, November 2, 1984, 02:19:04 UTC · 23.923°S, 179.367°E
A magnitude 4.7 earthquake struck south of the Fiji Islands on Friday, November 2, 1984, 02:19:04 UTC, at a depth of 566.5 km (deep). It is the strongest earthquake within 300 km since an M4.7 on October 31, 1984.
- Magnitude
- 4.7
- Light · mb
- Depth
- 567 km
- Deep
- Felt reports
- 0
- Did You Feel It?
- Est. shaking
- —
- No ShakeMap
- PAGER alert
- None
- Not issued
- Tsunami
- No flag
- USGS feed
Outlined circle: this earthquake
In context
How big was it, and why here?
Energy released
169 tons of TNT
That is about 1/89 of the Hiroshima bomb. A magnitude 5.0 releases about 3 times more energy.
Tectonic setting
325 km
from the nearest mapped plate boundary, between the Kermadec and Australian plates. Earthquakes this far from a boundary happen on faults inside a plate, often less frequently but sometimes strongly.
Depth: deep
567 km
Deep earthquakes (over 300 km) happen deep inside subducting plates. They rarely cause damage, but can be felt faintly over very large distances.
Did You Feel It?
Where it was felt
No “Did You Feel It?” reports have been published for this event yet. If you felt it, you can add your report on the USGS website.
I felt it — report to USGS ↗USGS PAGER estimate
Who was exposed to shaking
USGS publishes PAGER impact estimates for significant earthquakes, usually within an hour. No PAGER estimate is available for this event.
After the main event
Aftershocks within 50 km
USGS has not published any M2.5+ earthquake within 50 km in the 30 days after this event.
Regional history
Past M5+ earthquakes within 300 km
USGS lists 331 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 7.3Fiji regionMay 25, 1944 · 288 km NE of this epicenter
- 7.3south of the Fiji IslandsMarch 30, 1972 · 211 km S of this epicenter
- 7.2south of the Fiji IslandsFebruary 10, 1969 · 137 km NW of this epicenter
- 7.1Fiji regionFebruary 25, 1915 · 275 km NE of this epicenter
- 6.7south of the Fiji IslandsDecember 28, 1964 · 223 km NE of this epicenter
- 6.7Fiji regionJanuary 24, 1969 · 255 km NE of this epicenter
- 6.5south of the Fiji IslandsFebruary 15, 1971 · 172 km SW of this epicenter
- 6.5south of the Fiji IslandsNovember 20, 1971 · 99 km NE of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 1 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700. The most severe:
- 1932M7.9
Kermadec Islands
26 May 1932 · 176 km away
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.