Reviewed by USGSPapua New Guinea53y ago
M4.5 earthquake 67 km SSW of Panguna, Papua New Guinea
Thursday, April 4, 1974, 19:30:55 UTC · 6.865°S, 155.213°E
A magnitude 4.5 earthquake struck 67 km SSW of Panguna, Papua New Guinea on Thursday, April 4, 1974, 19:30:55 UTC, at a depth of 56.0 km (shallow). It is the strongest earthquake within 300 km since an M5.7 on April 2, 1974.
- Magnitude
- 4.5
- Light · mb
- Depth
- 56 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
85 tons of TNT
That is about 1/178 of the Hiroshima bomb. A magnitude 5.0 releases about 6 times more energy.
Tectonic setting
48 km
from the nearest mapped plate boundary, between the Pacific and North Bismarck plates. Earthquakes cluster along boundaries like this one, where plates collide, pull apart or slide past each other.
Depth: shallow
56 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 1 M2.5+ earthquake within 50 km in the following 30 days; the largest was M5.2 on April 4, 1974. 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 295 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 · 274 km NW of this epicenter
- 8.01971 New Britain EarthquakeJuly 14, 1971 · 215 km NW of this epicenter
- 7.885 km S of Panguna, Papua New GuineaJanuary 30, 1939 · 31 km SE of this epicenter
- 7.7152 km SE of Kokopo, Papua New GuineaSeptember 29, 1946 · 277 km NW of this epicenter
- 7.5199 km SSE of Kokopo, Papua New GuineaAugust 17, 1972 · 271 km W of this epicenter
- 7.3166 km SE of Kokopo, Papua New GuineaFebruary 12, 1968 · 265 km NW of this epicenter
- 7.361 km NW of Gizo, Solomon IslandsApril 19, 1936 · 168 km SE of this epicenter
- 7.3192 km ESE of Kokopo, Papua New GuineaDecember 25, 1967 · 241 km NW of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 13 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 8 recorded deaths. The most severe:
- 1939M7.7
Bougainville Island
30 Jan 1939 · 31 km away
5 deathsModerate damage ($1–5M)tsunami
- 1971M7.9
New Ireland: Bougainville
14 Jul 1971 · 210 km away · intensity IX
3 deathsUnder $1 million damagetsunami
- 1959M7.3
Solomon Islands
17 Aug 1959 · 112 km away
Severe damage ($5–24M)tsunami
- 1974M7.1
Solomon Islands
1 Feb 1974 · 73 km away · intensity VI
Moderate damage ($1–5M)tsunami
- 1919M8.2
Solomon Islands
6 May 1919 · 274 km away
Limited damage (under $1M)tsunami
- 1968M7.8
New Ireland
12 Feb 1968 · 269 km away · intensity VIII
Limited damage (under $1M)
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.