Reviewed by USGSPapua New Guinea51y ago
M4.9 earthquake 117 km SW of Panguna, Papua New Guinea
Sunday, August 10, 1975, 05:39:55 UTC · 7.117°S, 154.787°E
A magnitude 4.9 earthquake struck 117 km SW of Panguna, Papua New Guinea on Sunday, August 10, 1975, 05:39:55 UTC, at a depth of 34.0 km (shallow). It is the strongest earthquake within 300 km since an M5.3 on August 10, 1975.
- Magnitude
- 4.9
- Light · mb
- Depth
- 34 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
338 tons of TNT
That is about 1/45 of the Hiroshima bomb. A magnitude 5.0 releases about 1 times more energy.
Tectonic setting
0 km
from the nearest mapped plate boundary, between the North Bismarck and Solomon Sea plates. Earthquakes cluster along boundaries like this one, where plates collide, pull apart or slide past each other.
Depth: shallow
34 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 3 M2.5+ earthquakes within 50 km in the following 30 days; the largest was M5.1 on September 2, 1975. 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 417 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 · 277 km N of this epicenter
- 8.01971 New Britain EarthquakeJuly 14, 1971 · 210 km NW of this epicenter
- 7.956 km WSW of Panguna, Papua New GuineaJuly 20, 1975 · 66 km NE of this epicenter
- 7.885 km S of Panguna, Papua New GuineaJanuary 30, 1939 · 66 km E of this epicenter
- 7.794 km SSW of Panguna, Papua New GuineaJuly 20, 1975 · 40 km E of this epicenter
- 7.7152 km SE of Kokopo, Papua New GuineaSeptember 29, 1946 · 266 km NW of this epicenter
- 7.5199 km SSE of Kokopo, Papua New GuineaAugust 17, 1972 · 240 km NW of this epicenter
- 7.3166 km SE of Kokopo, Papua New GuineaFebruary 12, 1968 · 249 km NW of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 16 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 · 66 km away
5 deathsModerate damage ($1–5M)tsunami
- 1971M7.9
New Ireland: Bougainville
14 Jul 1971 · 205 km away · intensity IX
3 deathsUnder $1 million damagetsunami
- 1975M7.9
Bismarck Sea: Bougainville
20 Jul 1975 · 66 km away · intensity VIII
Severe damage ($5–24M)tsunami
- 1959M7.3
Solomon Islands
17 Aug 1959 · 140 km away
Severe damage ($5–24M)tsunami
- 1974M7.1
Solomon Islands
1 Feb 1974 · 95 km away · intensity VI
Moderate damage ($1–5M)tsunami
- 1919M8.2
Solomon Islands
6 May 1919 · 277 km away
Limited damage (under $1M)tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.