Reviewed by USGSPapua New Guinea29y ago
M4.2 earthquake 76 km SE of Madang, Papua New Guinea
Thursday, February 12, 1998, 16:56:16 UTC · 5.664°S, 146.318°E
A magnitude 4.2 earthquake struck 76 km SE of Madang, Papua New Guinea on Thursday, February 12, 1998, 16:56:16 UTC, at a depth of 69.4 km (shallow).
- Magnitude
- 4.2
- Light · mb
- Depth
- 69 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
60 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
69 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 2 M2.5+ earthquakes within 50 km in the following 30 days; the largest was M4.1 on February 21, 1998. 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 861 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 · 119 km SE of this epicenter
- 7.638 km NW of Finschhafen, Papua New GuineaOctober 2, 1906 · 158 km SE of this epicenter
- 7.548 km NW of Finschhafen, Papua New GuineaMay 12, 1938 · 151 km SE of this epicenter
- 7.549 km WSW of Wau, Papua New GuineaFebruary 26, 1963 · 207 km S of this epicenter
- 7.492 km WSW of Kandrian, Papua New GuineaMay 6, 1947 · 285 km E of this epicenter
- 7.454 km NNW of Finschhafen, Papua New GuineaFebruary 8, 1987 · 159 km E of this epicenter
- 7.2117 km N of Finschhafen, Papua New GuineaDecember 22, 1997 · 172 km E of this epicenter
- 7.261 km NNW of Finschhafen, Papua New GuineaMay 15, 1992 · 146 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 · 45 km away
74 deathsModerate damage ($1–5M)
- 1993M6.9
Eastern: Upper Markham Valley
13 Oct 1993 · 41 km away
60 deaths$5 million damage
- 1970M7.3
Madang
31 Oct 1970 · 126 km away · intensity VIII
18 deaths$2 million damagetsunami
- 1987M7.6
Huon Peninsula, Umboi Island
8 Feb 1987 · 159 km away · intensity VII
3 deaths$3 million damagetsunami
- 1857M8.0
Bismarck Sea
17 Apr 1857 · 78 km away
Moderate damage ($1–5M)tsunami
- 1873M8.0
Maclay Coast
1873 · 40 km away · intensity IX
Moderate damage ($1–5M)tsunami
NOAA NCEI Global Significant Earthquake Database. Historical figures are estimates; older records are incomplete.