M4.8 earthquake 81 km E of Union, Philippines
A magnitude 4.8 earthquake struck 81 km E of Union, Philippines on Sun, Sep 23, 1973, 9:23 PM GMT+8 (13:23 UTC), 37 km (23 mi) below the surface.
A larger quake followed: M4.9 13 km E of Pilar, Philippines. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.8 (mb), light
- Local time
- UTC
- 1973-09-23 13:23:58 UTC
- Depth
- 37.0 km (23.0 mi), shallow
- Epicenter
- 9.831° N, 126.850° E
- Region
- Philippines
- 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.
- Stations used
- 16
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.8 and up: 7 in the 60 days after this one and 4 in the 30 days before it.
After
- 4.913 km E of Pilar, Philippines · 19359 days ago · 45 km deep · 68 km away
- 5.228 km ENE of Pilar, Philippines · 19359 days ago · 46 km deep · 57 km away
- 5.649 km E of Union, Philippines · 19358 days ago · 45 km deep · 32 km away
- 5.26 km NNE of Pilar, Philippines · 19352 days ago · 77 km deep · 80 km away
- 4.911 km ESE of Santa Monica, Philippines · 19350 days ago · 76 km deep · 80 km away
- 5.05 km E of Pilar, Philippines · 19349 days ago · 71 km deep · 77 km away
- 4.975 km ENE of Pilar, Philippines · 19349 days ago · 44 km deep · 37 km away
Before
- 4.576 km ENE of Pilar, Philippines · 19359 days ago · 33 km deep · 31 km away
- 4.74 km E of Union, Philippines · 19360 days ago · 69 km deep · 77 km away
- 5.17 km ESE of Pilar, Philippines · 19360 days ago · 54 km deep · 76 km away
- 5.325 km ENE of Pilar, Philippines · 19360 days ago · 36 km deep · 61 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00003hh. Read Thu, Sep 24, 2026, 5:14 AM UTC.