Reviewed by USGSPapua New Guinea34y ago
M3.8 earthquake 79 km NNW of Lae, Papua New Guinea
Tuesday, February 23, 1993, 07:50:04 UTC · 6.115°S, 146.616°E
A magnitude 3.8 earthquake struck 79 km NNW of Lae, Papua New Guinea on Tuesday, February 23, 1993, 07:50:04 UTC, at a depth of 33.0 km (shallow).
- Magnitude
- 3.8
- Minor · 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
8 tons of TNT
That is about 1/1,992 of the Hiroshima bomb. A magnitude 5.0 releases about 63 times more energy.
Tectonic setting
42 km
from the nearest mapped plate boundary, between the South Bismarck and Woodlark 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 1 M2.5+ earthquake within 50 km in the following 30 days; the largest was M3.7 on February 24, 1993. 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 676 M5.0+ earthquakes within 300 km before this one (catalog from 1900; older records are less complete). The strongest:
- 8.01906 Papua New Guinea EarthquakeSeptember 14, 1906 · 68 km E of this epicenter
- 7.638 km NW of Finschhafen, Papua New GuineaOctober 2, 1906 · 110 km E of this epicenter
- 7.548 km NW of Finschhafen, Papua New GuineaMay 12, 1938 · 105 km E of this epicenter
- 7.549 km WSW of Wau, Papua New GuineaFebruary 26, 1963 · 160 km S of this epicenter
- 7.492 km WSW of Kandrian, Papua New GuineaMay 6, 1947 · 240 km E of this epicenter
- 7.454 km W of Kandrian, Papua New GuineaOctober 16, 1987 · 271 km E of this epicenter
- 7.454 km NNW of Finschhafen, Papua New GuineaFebruary 8, 1987 · 119 km E of this epicenter
- 7.261 km NNW of Finschhafen, Papua New GuineaMay 15, 1992 · 106 km E of this epicenter
History · NOAA
Deadliest earthquakes in this area
NOAA’s significant-earthquake database lists 21 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 155 recorded deaths. The most severe:
- 1988M4.3
Kaiapit (Landslide Generated)
6 Sep 1988 · 43 km away
74 deathsModerate damage ($1–5M)
- 1993M6.9
Eastern: Upper Markham Valley
13 Oct 1993 · 71 km away
60 deaths$5 million damage
- 1970M7.3
Madang
31 Oct 1970 · 185 km away · intensity VIII
18 deaths$2 million damagetsunami
- 1987M7.6
Huon Peninsula, Umboi Island
8 Feb 1987 · 119 km away · intensity VII
3 deaths$3 million damagetsunami
- 1906M8.0
New Britain
14 Sep 1906 · 281 km away
Severe damage ($5–24M)tsunami
- 1857M8.0
Bismarck Sea
17 Apr 1857 · 81 km away
Moderate damage ($1–5M)tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.