M5.0 earthquake 75 km SW of Basco, Philippines
A magnitude 5.0 earthquake struck 75 km SW of Basco, Philippines on Sat, Jul 21, 1973, 7:46 PM GMT+8 (11:46 UTC), 72 km (45 mi) below the surface.
A larger quake followed: M5.1 106 km NNE of Namuac, Philippines. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 5.0 (mb), moderate
- Local time
- UTC
- 1973-07-21 11:46:34 UTC
- Depth
- 72.0 km (44.7 mi), intermediate-depth
- Epicenter
- 20.037° N, 121.395° 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
- 36
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 2.0 and up: 2 in the 60 days after this one and 1 in the 30 days before it.
After
- 3.9141 km N of Pagudpud, Philippines · 19422 days ago · 70 km deep · 75 km away
- 5.1106 km NNE of Namuac, Philippines · 19386 days ago · 44 km deep · 63 km away
Before
Earthquakes todayPhilippines earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00002sw (also filed as iscgem758552). Read Wed, Sep 23, 2026, 7:10 AM UTC.