Indonesia earthquakes

M5.1 earthquake 236 km ESE of Biak, Indonesia

A magnitude 5.1 earthquake struck 236 km ESE of Biak, Indonesia on Mon, Jul 23, 1973, 5:30 PM GMT+9 (08:30 UTC), 33 km (21 mi) below the surface.

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Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
5.1 (mb), moderate
Local time
UTC
1973-07-23 08:30:01 UTC
Depth
33.0 km (20.5 mi), shallow
Epicenter
2.219° S, 137.933° E
Region
Indonesia
Tsunami flag
No
Status
Reviewed by a seismologist

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
30

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 2.1 and up: 2 in the 60 days after this one and 1 in the 30 days before it.

After

  1. 4.9227 km ESE of Biak, Indonesia · 19403 days ago · 13 km deep · 17 km away
  2. 5.1249 km W of Abepura, Indonesia · 19368 days ago · 23 km deep · 60 km away

Before

  1. 5.0206 km W of Abepura, Indonesia · 19444 days ago · 33 km deep · 99 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp00002ts (also filed as iscgem758611). Read Tue, Sep 22, 2026, 8:21 AM UTC.