M5.5 earthquake 34 km ENE of Biak, Indonesia
A magnitude 5.5 earthquake struck 34 km ENE of Biak, Indonesia on Fri, Jul 20, 1973, 11:19 AM GMT+9 (02:19 UTC), 33 km (21 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 5.5 (mb, body-wave), moderate
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 1973-07-20 02:19:08 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 1.018° S, 136.350° E
- Region
- Indonesia
- Strongest shaking
- V, moderate shaking
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
Shaking
The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.
- Strongest estimated
- V, moderate shaking
- Peak ground acceleration
- 7.9% of gravity
- Peak ground velocity
- 1.5 cm/s
- Map
- Automatic
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
- OPERATOR_ASSIGNED
- Stations used
- 12
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 2.5 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 usp00002s6. Read Sun, Oct 4, 2026, 1:46 PM UTC.