M4.6 earthquake 12 km WNW of Nagbacalan, Philippines
A magnitude 4.6 earthquake struck 12 km WNW of Nagbacalan, Philippines on Wed, Feb 23, 1977, 4:03 PM GMT+8 (08:03 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M4.9 26 km W of Tamorong, Philippines. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.6 (mb, body-wave), light
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 1977-02-23 08:03:56 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 18.173° N, 120.421° 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.
- Depth from
- OPERATOR_ASSIGNED
- Stations used
- 10
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.6 and up: 1 in the 60 days after this one and 0 in the 30 days before it.
After
Earthquakes todayPhilippines earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000mpj. Read Thu, Oct 1, 2026, 5:55 AM UTC.