Reviewed by USGSVanuatu22y ago
M4.0 earthquake 201 km SSE of Isangel, Vanuatu
Wednesday, September 29, 2004, 07:40:55 UTC · 21.119°S, 170.239°E
A magnitude 4.0 earthquake struck 201 km SSE of Isangel, Vanuatu on Wednesday, September 29, 2004, 07:40:55 UTC, at a depth of 212.5 km (intermediate).
- Magnitude
- 4.0
- Light · mb
- Depth
- 213 km
- Intermediate
- 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
15 tons of TNT
That is about 1/998 of the Hiroshima bomb. A magnitude 5.0 releases about 32 times more energy.
Tectonic setting
125 km
from the nearest mapped plate boundary, between the New Hebrides and Australian plates. Earthquakes this far from a boundary happen on faults inside a plate, often less frequently but sometimes strongly.
Depth: intermediate
213 km
Intermediate-depth earthquakes usually break inside a plate that is sinking into the mantle. Shaking spreads over a wide area but is gentler at the epicenter than a shallow quake of the same size.
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 1,074 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 8.11920 Vanuatu EarthquakeSeptember 20, 1920 · 223 km NW of this epicenter
- 7.828 km ESE of Isangel, VanuatuJune 16, 1910 · 184 km NW of this epicenter
- 7.7249 km E of Vao, New CaledoniaMay 16, 1995 · 213 km S of this epicenter
- 7.663 km NW of Isangel, VanuatuOctober 14, 1913 · 265 km NW of this epicenter
- 7.6274 km ESE of Tadine, New CaledoniaMarch 16, 1928 · 139 km S of this epicenter
- 7.5southeast of the Loyalty IslandsJanuary 4, 1998 · 149 km SE of this epicenter
- 7.447 km NW of Isangel, VanuatuOctober 11, 1992 · 248 km NW of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 20 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 26 recorded deaths. The most severe:
- 1875M8.1
Loyalty Islands: Lifou Island
28 Mar 1875 · 220 km away
26 deathsSevere damage ($5–24M)tsunami
- 1901M7.9
Loyalty Islands
9 Aug 1901 · 101 km away
Moderate damage ($1–5M)tsunami
- 1920M8.1
Loyalty Islands
20 Sep 1920 · 223 km away
Limited damage (under $1M)tsunami
- 1878M7.5
Tanna Island
10 Jan 1878 · 297 km away
Limited damage (under $1M)tsunami
- 1913M8.1
Vanuatu Islands
14 Oct 1913 · 222 km away
- 1878M8.0
Vanuatu Islands
11 Feb 1878 · 297 km away
tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.