Reviewed by USGSPapua New Guinea26y ago
M4.2 earthquake 156 km SSW of Kokopo, Papua New Guinea
Tuesday, January 23, 2001, 20:28:49 UTC · 5.722°S, 151.936°E
A magnitude 4.2 earthquake struck 156 km SSW of Kokopo, Papua New Guinea on Tuesday, January 23, 2001, 20:28:49 UTC, at a depth of 33.0 km (shallow).
- Magnitude
- 4.2
- 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
30 tons of TNT
That is about 1/500 of the Hiroshima bomb. A magnitude 5.0 releases about 16 times more energy.
Tectonic setting
18 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 3 M2.5+ earthquakes within 50 km in the following 30 days; the largest was M5.2 on January 29, 2001. 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 1,708 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 · 236 km NE of this epicenter
- 8.11971 Bougainville EarthquakeJuly 26, 1971 · 167 km NE of this epicenter
- 8.01971 New Britain EarthquakeJuly 14, 1971 · 215 km E of this epicenter
- 8.02000 New Ireland EarthquakeNovember 16, 2000 · 195 km N of this epicenter
- 8.060 km SE of Kokopo, Papua New GuineaJanuary 1, 1916 · 132 km NE of this epicenter
- 7.874 km SSW of Kokopo, Papua New GuineaFebruary 2, 1920 · 84 km N of this epicenter
- 7.8138 km SSW of Kokopo, Papua New GuineaNovember 17, 2000 · 30 km NW of this epicenter
- 7.8135 km SE of Kokopo, Papua New GuineaNovember 16, 2000 · 140 km NE of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 39 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 529 recorded deaths. The most severe:
- 1937
Keravia, Rabaul, Kokopo
28 May 1937 · 164 km away · intensity VIII
507 deathsLimited damage (under $1M)tsunami
- 1983M6.4
Ulawun, Rabaul
22 Dec 1983 · 37 km away · intensity V
10 deaths$25 million damage
- 1941M7.4
Bismarck Sea
13 Jan 1941 · 173 km away
4 deathsModerate damage ($1–5M)tsunami
- 1971M7.9
New Ireland: Bougainville
14 Jul 1971 · 219 km away · intensity IX
3 deathsUnder $1 million damagetsunami
- 2000M8.0
New Ireland, Duke Of York
16 Nov 2000 · 196 km away
2 deathsModerate damage ($1–5M)tsunami
- 1985M7.1
New Britain: Bialla, Piona
10 May 1985 · 100 km away · intensity VIII
1 death$1 million damage
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.