M4.6 earthquake 122 km SSE of Kokopo, Papua New Guinea

Saturday, December 23, 2000, 02:52:55 UTC · 5.399°S, 152.606°E

A magnitude 4.6 earthquake struck 122 km SSE of Kokopo, Papua New Guinea on Saturday, December 23, 2000, 02:52:55 UTC, at a depth of 33.0 km (shallow). It is the strongest earthquake within 300 km since an M4.9 on December 22, 2000.

Magnitude: 4.6; Light · mb
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: 50 km aftershock search area

In context

How big was it, and why here?

Energy released

120 tons of TNT

That is about 1/126 of the Hiroshima bomb. A magnitude 5.0 releases about 4 times more energy.

Tectonic setting

27 km

from the nearest mapped plate boundary, between the South Bismarck and Solomon Sea 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 50 km

USGS lists 7 M2.5+ earthquakes within 50 km in the following 30 days; the largest was M4.7 on January 10, 2001. Most nearby activity right after a large earthquake is aftershocks, which usually become less frequent over days and weeks.

Time after the mainshock on a logarithmic scale (first hours stretched), magnitude on the vertical axis. M2.5+ events from USGS.

Regional history

Past M5+ earthquakes within 300 km

USGS lists 1,859 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 41 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 530 recorded deaths. The most severe:

1937
Keravia, Rabaul, Kokopo
28 May 1937 · 133 km away · intensity VIII
507 deathsLimited damage (under $1M)tsunami
1983M6.4
Ulawun, Rabaul
22 Dec 1983 · 82 km away · intensity V
10 deaths$25 million damage
1941M7.4
Bismarck Sea
13 Jan 1941 · 148 km away
4 deathsModerate damage ($1–5M)tsunami
1971M7.9
New Ireland: Bougainville
14 Jul 1971 · 144 km away · intensity IX
3 deathsUnder $1 million damagetsunami
2000M8.0
New Ireland, Duke Of York
16 Nov 2000 · 158 km away
2 deathsModerate damage ($1–5M)tsunami
1996M7.2
Bougainville Island
29 Apr 1996 · 292 km away
1 deathModerate damage ($1–5M)

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

Nearby trackers