M5.5 earthquake 127 km SW of Abepura, Indonesia

Friday, January 29, 1971, 03:16:10 UTC · 3.334°S, 139.749°E

A magnitude 5.5 earthquake struck 127 km SW of Abepura, Indonesia on Friday, January 29, 1971, 03:16:10 UTC, at a depth of 69.8 km (shallow). It is the strongest earthquake within 300 km since an M5.6 on January 18, 1971.

Magnitude: 5.5; Moderate · mw
Depth: 70 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 earthquake

In context

How big was it, and why here?

Energy released

3 kilotons of TNT

That is about 1/5 of the Hiroshima bomb. It released about 6 times the energy of a magnitude 5.0.

Tectonic setting

14 km

from the nearest mapped plate boundary, between the Woodlark and Maoke plates. Earthquakes cluster along boundaries like this one, where plates collide, pull apart or slide past each other.

Depth: shallow

70 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 75 km

USGS has not published any M2.5+ earthquake within 75 km in the 30 days after this event.

Regional history

Past M5+ earthquakes within 300 km

USGS lists 99 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 10 damaging, deadly or tsunami-generating earthquakes within 300 km of this epicenter since 1700, which together caused about 5 recorded deaths. The most severe:

1900M6.9
Nw. Irian Jaya
7 Oct 1900 · 79 km away
5 deathsLimited damage (under $1M)tsunami
1971M8.1
New Guinea: Irian Jaya:Djajapura,Sentani
10 Jan 1971 · 27 km away · intensity IX
Moderate damage ($1–5M)
1921
New Guinea: Irian Jaya: Sentani
10 Oct 1921 · 156 km away · intensity VII
Moderate damage ($1–5M)
1951M6.1
Bismarck Sea
22 Feb 1951 · 276 km away
Limited damage (under $1M)tsunami
1919
Irian Jaya Region
21 Nov 1919 · 141 km away · intensity VIII
Limited damage (under $1M)tsunami
1926M7.9
New Guinea: Irian Jaya
26 Oct 1926 · 140 km away

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

Nearby trackers