M5.4 earthquake 50 km ENE of Biak, Indonesia
A magnitude 5.4 earthquake struck 50 km ENE of Biak, Indonesia on Tue, Apr 14, 1981, 1:38 AM GMT+9 (16:38 UTC), 21 km (13 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 5.4 (mb, body-wave), moderate
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 1981-04-13 16:38:59 UTC
- Depth
- 21.3 km (13.2 mi), shallow
- Epicenter
- 1.075° S, 136.521° E
- Region
- Indonesia
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
Magnitude estimates
Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.
| Mag. | Scale | Computed by | Notes |
|---|---|---|---|
| 5.4 | mb, body-wave | USGS National Earthquake Information Center | Preferred · Reviewed · 19 stations |
| 5.49 | Mw, moment | ISC-GEM global catalog | Final · ±0.1 |
| 5.5 | Mwc, centroid moment | Global CMT project | Preliminary |
Did you feel it?
No one has reported feeling this quake to the USGS.
How well it is located
Reviewed by a seismologist.
- Depth from
- FROM_LOCATION
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 2.4 and up: 0 in the 60 days after this one and 0 in the 30 days before it.
None recorded.
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0001d4q (also filed as gcmtb041381b, gcmt19810413163859, iscgem628168). Read Thu, Oct 1, 2026, 12:41 PM UTC.