Reviewed by USGS40y ago
M5.2 earthquake in Kermadec Islands region
Wednesday, February 25, 1987, 02:01:21 UTC · 27.912°S, 177.074°W
A magnitude 5.2 earthquake struck in Kermadec Islands region on Wednesday, February 25, 1987, 02:01:21 UTC, at a depth of 71.7 km (intermediate). It is the strongest earthquake within 300 km since an M5.7 on January 13, 1987.
- Magnitude
- 5.2
- Moderate · mw
- Depth
- 72 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
951 tons of TNT
That is about 1/16 of the Hiroshima bomb. It released about 2 times the energy of a magnitude 5.0.
Tectonic setting
122 km
from the nearest mapped plate boundary, between the Kermadec and Pacific plates. Earthquakes this far from a boundary happen on faults inside a plate, often less frequently but sometimes strongly.
Depth: intermediate
72 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 75 km
USGS has not published any M2.5+ earthquake within 75 km in the 30 days after this event.
Regional history
Past M5+ earthquakes within 300 km
USGS lists 746 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 8.01976 Kermadec Islands, New Zealand EarthquakeJanuary 14, 1976 · 81 km SW of this epicenter
- 7.7Kermadec Islands regionOctober 20, 1986 · 73 km E of this epicenter
- 7.5Kermadec Islands regionFebruary 27, 1955 · 152 km E of this epicenter
- 7.5Kermadec Islands, New ZealandNovember 16, 1917 · 228 km S of this epicenter
- 7.3Kermadec Islands regionSeptember 14, 1959 · 104 km S of this epicenter
- 7.3Kermadec Islands, New ZealandMarch 26, 1963 · 239 km S of this epicenter
- 7.3south of the Fiji IslandsJanuary 20, 1970 · 223 km N of this epicenter
- 7.2Kermadec Islands regionJuly 2, 1974 · 170 km SE of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 11 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700. The most severe:
- 1986M8.1
Raoul
20 Oct 1986 · 73 km away
Limited damage (under $1M)tsunami
- 1976M7.9
Kermadec Islands
14 Jan 1976 · 147 km away
Limited damage (under $1M)tsunami
- 1917M8.0
Kermadec Islands
1 May 1917 · 143 km away
tsunami
- 1955M7.8
Kermadec Islands
27 Feb 1955 · 155 km away
- 1976M7.8
Kermadec Islands
14 Jan 1976 · 224 km away · intensity VIII
- 1959M7.7
Kermadec Islands
14 Sep 1959 · 66 km away
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.