Reviewed by USGS29y ago
M5.3 earthquake south of the Kermadec Islands
Wednesday, June 18, 1997, 19:31:54 UTC · 32.853°S, 178.340°W
A magnitude 5.3 earthquake struck south of the Kermadec Islands on Wednesday, June 18, 1997, 19:31:54 UTC, at a depth of 33.0 km (shallow). It is the strongest earthquake within 300 km since an M7.1 on May 25, 1997.
- Magnitude
- 5.3
- Moderate · mwc
- Depth
- 33 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: 75 km aftershock search area
In context
How big was it, and why here?
Energy released
1 kilotons of TNT
That is about 1/11 of the Hiroshima bomb. It released about 3 times the energy of a magnitude 5.0.
Tectonic setting
57 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
33 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 75 km
USGS lists 4 M2.5+ earthquakes within 75 km in the following 30 days; the largest was M5.2 on June 30, 1997. 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 883 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 8.21917 Kermadec Islands, New Zealand EarthquakeMay 1, 1917 · 243 km NE of this epicenter
- 7.3Kermadec Islands, New ZealandJuly 25, 1968 · 229 km N of this epicenter
- 7.2Kermadec Islands, New ZealandFebruary 9, 1978 · 259 km N of this epicenter
- 7.2Kermadec Islands, New ZealandApril 17, 1919 · 255 km N of this epicenter
- 7.1Kermadec Islands, New ZealandJune 29, 1910 · 246 km NE of this epicenter
- 7.1Kermadec Islands, New ZealandSeptember 26, 1968 · 249 km N of this epicenter
- 7.1south of the Kermadec IslandsMay 25, 1997 · 194 km NW of this epicenter
- 7.0Kermadec Islands, New ZealandMay 20, 1968 · 229 km N of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 2 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700. The most severe:
- 1968M7.3
S Of, Raoul
25 Jul 1968 · 228 km away
Limited damage (under $1M)tsunami
- 1978M7.7
S Of
9 Feb 1978 · 259 km away
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.