Reviewed by USGSPapua New Guinea71y ago
M7.3 earthquake 102 km SE of Kokopo, Papua New Guinea
Monday, October 10, 1955, 08:57:50 UTC · 5.062°S, 152.855°E
A magnitude 7.3 earthquake struck 102 km SE of Kokopo, Papua New Guinea on Monday, October 10, 1955, 08:57:50 UTC, at a depth of 20.0 km (shallow). It is the strongest earthquake within 300 km since an M7.4 on April 23, 1953.
- Magnitude
- 7.3
- Major · mw
- Depth
- 20 km
- Shallow
- Felt reports
- 0
- Did You Feel It?
- Est. shaking
- VII
- Very strong (ShakeMap)
- PAGER alert
- None
- Not issued
- Tsunami
- No flag
- USGS feed
Outlined circle: this earthquakeColoured lines: estimated shaking intensity (USGS ShakeMap)
In context
How big was it, and why here?
Energy released
1.4 megatons of TNT
That is about 92 times the Hiroshima bomb. It released about 2,917 times the energy of a magnitude 5.0.
Tectonic setting
34 km
from the nearest mapped plate boundary, between the North Bismarck and South Bismarck plates. Earthquakes cluster along boundaries like this one, where plates collide, pull apart or slide past each other.
Depth: shallow
20 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 200 km
USGS has not published any M2.5+ earthquake within 200 km in the 30 days after this event.
Regional history
Past M5+ earthquakes within 300 km
USGS lists 149 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 8.21919 Papua New Guinea EarthquakeMay 6, 1919 · 115 km E of this epicenter
- 8.060 km SE of Kokopo, Papua New GuineaJanuary 1, 1916 · 42 km NW of this epicenter
- 7.874 km SSW of Kokopo, Papua New GuineaFebruary 2, 1920 · 93 km W of this epicenter
- 7.7152 km SE of Kokopo, Papua New GuineaSeptember 29, 1946 · 56 km E of this epicenter
- 7.467 km E of Kokopo, Papua New GuineaApril 23, 1953 · 68 km N of this epicenter
- 7.497 km SW of Rabaul, Papua New GuineaMay 30, 1913 · 152 km W of this epicenter
- 7.3195 km E of Kavieng, Papua New GuineaMay 25, 1944 · 290 km N of this epicenter
- 7.2155 km WNW of Panguna, Papua New GuineaOctober 19, 1949 · 168 km SE of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 22 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 512 recorded deaths. The most severe:
- 1937
Keravia, Rabaul, Kokopo
28 May 1937 · 114 km away · intensity VIII
507 deathsLimited damage (under $1M)tsunami
- 1941M7.4
Bismarck Sea
13 Jan 1941 · 131 km away
4 deathsModerate damage ($1–5M)tsunami
- 1878
Bismarck Sea
4 Feb 1878 · 112 km away
1 deathtsunami
- 1899
New Ireland: East Coast
15 Jan 1899 · 248 km away
Moderate damage ($1–5M)tsunami
- 1919M8.2
Solomon Islands
6 May 1919 · 115 km away
Limited damage (under $1M)tsunami
- 1916M7.9
Solomon Islands
1 Jan 1916 · 49 km away
Limited damage (under $1M)tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.