Reviewed by USGS7y ago
M4.1 earthquake in Fiji region
Wednesday, March 13, 2019, 16:46:42 UTC · 18.753°S, 177.651°W
A magnitude 4.1 earthquake struck in Fiji region on Wednesday, March 13, 2019, 16:46:42 UTC, at a depth of 550.5 km (deep).
- Magnitude
- 4.1
- Light · mb
- Depth
- 551 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
112 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
551 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 5 M2.5+ earthquakes within 50 km in the following 30 days; the largest was M4.5 on April 6, 2019. Most nearby activity right after a large earthquake is aftershocks, which usually become less frequent over days and weeks.
Regional history
Past M5+ earthquakes within 300 km
USGS lists 1,796 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 8.22018 Fiji EarthquakeAugust 19, 2018 · 89 km NW of this epicenter
- 7.8159 km W of Pangai, TongaDecember 14, 1950 · 214 km SE of this epicenter
- 7.8Fiji regionJanuary 1, 1919 · 77 km SW of this epicenter
- 7.6178 km E of Levuka, FijiFebruary 22, 1909 · 155 km NW of this epicenter
- 7.6240 km E of Levuka, FijiMarch 9, 1994 · 113 km NW of this epicenter
- 7.5262 km WNW of Haveluloto, TongaMay 21, 1962 · 150 km S of this epicenter
- 7.4227 km E of Levuka, FijiAugust 21, 1910 · 141 km NW of this epicenter
- 7.4Fiji regionSeptember 28, 1957 · 212 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:
- 1932M6.4
Koro,Mudu,Suvasavu
8 Mar 1932 · 281 km away · intensity VII
Moderate damage ($1–5M)
- 2018M8.2
Fiji Islands
19 Aug 2018 · 89 km away · intensity V
tsunami
- 1909M7.8
Fiji Islands
22 Feb 1909 · 165 km away
- 1919M7.8
Fiji Islands
1 Jan 1919 · 77 km away
tsunami
- 1950M7.7
Tonga Islands
14 Dec 1950 · 192 km away · intensity VI
- 1994M7.6
Fiji Islands
9 Mar 1994 · 113 km away
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.