M4.8 earthquake 125 km WNW of Panguna, Papua New Guinea

Saturday, June 5, 1976, 06:03:30 UTC · 5.702°S, 154.533°E

A magnitude 4.8 earthquake struck 125 km WNW of Panguna, Papua New Guinea on Saturday, June 5, 1976, 06:03:30 UTC, at a depth of 109.0 km (intermediate). It is the strongest earthquake within 300 km since an M6.2 on June 3, 1976.

Magnitude: 4.8; Light · mb
Depth: 109 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

239 tons of TNT

That is about 1/63 of the Hiroshima bomb. A magnitude 5.0 releases about 2 times more energy.

Tectonic setting

4 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: intermediate

109 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 50 km

USGS has not published any M2.5+ earthquake within 50 km in the 30 days after this event.

Regional history

Past M5+ earthquakes within 300 km

USGS lists 593 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:

History · NOAA

Deadliest earthquakes in this area

NOAA’s significant-earthquake database lists 27 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 9 recorded deaths. The most severe:

1939M7.7
Bougainville Island
30 Jan 1939 · 180 km away
5 deathsModerate damage ($1–5M)tsunami
1971M7.9
New Ireland: Bougainville
14 Jul 1971 · 74 km away · intensity IX
3 deathsUnder $1 million damagetsunami
1878
Bismarck Sea
4 Feb 1878 · 300 km away
1 deathtsunami
1975M7.9
Bismarck Sea: Bougainville
20 Jul 1975 · 114 km away · intensity VIII
Severe damage ($5–24M)tsunami
1959M7.3
Solomon Islands
17 Aug 1959 · 257 km away
Severe damage ($5–24M)tsunami
1967M6.4
Bismarck Sea
13 Aug 1967 · 268 km away
Severe damage ($5–24M)tsunami

NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.

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