Reviewed by USGS20y ago
M4.1 earthquake south of the Kermadec Islands
Saturday, November 4, 2006, 08:57:51 UTC · 33.495°S, 178.891°W
A magnitude 4.1 earthquake struck south of the Kermadec Islands on Saturday, November 4, 2006, 08:57:51 UTC, at a depth of 35.3 km (shallow).
- Magnitude
- 4.1
- Light · mb
- Depth
- 35 km
- Shallow
- 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
74 km
from the nearest mapped plate boundary, between the Kermadec and Pacific plates. Earthquakes cluster along boundaries like this one, where plates collide, pull apart or slide past each other.
Depth: shallow
35 km
Shallow earthquakes (under 70 km) produce the strongest surface shaking for their size, so they are the ones most likely to cause damage near the epicenter.
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 M4.9 on November 8, 2006. Most nearby activity right after a large earthquake is aftershocks, which usually become less frequent over days and weeks.
- 4.4south of the Kermadec Islands20y ago · 16 km E of this epicenter
- 4.5south of the Kermadec Islands20y ago · 25 km NW of this epicenter
- 4.2south of the Kermadec Islands20y ago · 32 km SE of this epicenter
- 4.6south of the Kermadec Islands20y ago · 43 km NW of this epicenter
- 4.9south of the Kermadec Islands20y ago · 32 km NW of this epicenter
Regional history
Past M5+ earthquakes within 300 km
USGS lists 894 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 7.4Kermadec Islands regionMay 16, 2006 · 191 km N of this epicenter
- 7.1south of the Kermadec IslandsMay 25, 1997 · 197 km NW of this epicenter
- 6.9Kermadec Islands regionMay 3, 1997 · 195 km N of this epicenter
- 6.9south of the Kermadec IslandsSeptember 26, 1985 · 135 km S of this epicenter
- 6.9south of the Kermadec IslandsJuly 11, 1943 · 123 km NE of this epicenter
- 6.8Kermadec Islands regionNovember 5, 1996 · 280 km N of this epicenter
- 6.8south of the Kermadec IslandsFebruary 17, 1987 · 87 km NW of this epicenter
- 6.8south of the Kermadec IslandsJanuary 8, 1970 · 262 km SW of this epicenter