Reviewed by USGSFiji22y ago
M4.1 earthquake 230 km E of Levuka, Fiji
Saturday, October 2, 2004, 10:20:30 UTC · 18.062°S, 178.503°W
A magnitude 4.1 earthquake struck 230 km E of Levuka, Fiji on Saturday, October 2, 2004, 10:20:30 UTC, at a depth of 579.2 km (deep).
- Magnitude
- 4.1
- Light · mb
- Depth
- 579 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 earthquakeDashed circle: 50 km aftershock search area
In context
How big was it, and why here?
Energy released
21 tons of TNT
That is about 1/707 of the Hiroshima bomb. A magnitude 5.0 releases about 22 times more energy.
Tectonic setting
211 km
from the nearest mapped plate boundary, between the Niuafo'ou and Australian plates. Earthquakes this far from a boundary happen on faults inside a plate, often less frequently but sometimes strongly.
Depth: deep
579 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 lists 12 M2.5+ earthquakes within 50 km in the following 30 days; the largest was M4.8 on October 31, 2004. Most nearby activity right after a large earthquake is aftershocks, which usually become less frequent over days and weeks.
- 4.8273 km E of Levuka, Fiji22y ago · 43 km E of this epicenter
- 4.3211 km E of Levuka, Fiji22y ago · 36 km NW of this epicenter
- 4.1230 km E of Levuka, Fiji22y ago · 33 km N of this epicenter
- 3.9266 km E of Levuka, Fiji22y ago · 48 km SE of this epicenter
- 4.4213 km E of Levuka, Fiji22y ago · 29 km NW of this epicenter
- 4.0259 km E of Levuka, Fiji22y ago · 32 km SE of this epicenter
- 4.8199 km E of Levuka, Fiji22y ago · 35 km NW of this epicenter
- 3.9255 km E of Levuka, Fiji22y ago · 25 km E of this epicenter
Regional history
Past M5+ earthquakes within 300 km
USGS lists 1,026 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 7.8Fiji regionJanuary 1, 1919 · 147 km S of this epicenter
- 7.6178 km E of Levuka, FijiFebruary 22, 1909 · 54 km W of this epicenter
- 7.6144 km SSW of Leava, Wallis and FutunaMay 23, 1956 · 294 km N of this epicenter
- 7.6240 km E of Levuka, FijiMarch 9, 1994 · 10 km E of this epicenter
- 7.5262 km WNW of Haveluloto, TongaMay 21, 1962 · 251 km SE of this epicenter
- 7.4227 km E of Levuka, FijiAugust 21, 1910 · 28 km N of this epicenter
- 7.4Fiji regionSeptember 28, 1957 · 276 km S of this epicenter
- 7.4Fiji regionAugust 5, 1996 · 293 km S of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 7 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700. The most severe:
- 1919M6.9
Rabi,Tunuloa Mission,Suvasavu
3 Oct 1919 · 244 km away · intensity VIII
Moderate damage ($1–5M)
- 1979M6.9
Fiji Islands
16 Nov 1979 · 214 km away
Moderate damage ($1–5M)tsunami
- 1932M6.4
Koro,Mudu,Suvasavu
8 Mar 1932 · 185 km away · intensity VII
Moderate damage ($1–5M)
- 1909M7.8
Fiji Islands
22 Feb 1909 · 53 km away
- 1919M7.8
Fiji Islands
1 Jan 1919 · 147 km away
tsunami
- 1994M7.6
Fiji Islands
9 Mar 1994 · 10 km away
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.