M4.9 earthquake 17 km WNW of General MacArthur, Philippines
A magnitude 4.9 earthquake struck 17 km WNW of General MacArthur, Philippines on Sun, Aug 20, 1978, 12:03 PM GMT+8 (04:03 UTC), 78 km (48 mi) below the surface.
A larger quake followed: M5.5 34 km ESE of Sulangan, Philippines. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 4.9 (mb), light
- Local time
- UTC
- 1978-08-20 04:03:29 UTC
- Depth
- 78.0 km (48.5 mi), intermediate-depth
- Epicenter
- 11.309° N, 125.394° 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
- 27
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.9 and up: 2 in the 60 days after this one and 2 in the 30 days before it.
After
- 5.534 km ESE of Sulangan, Philippines · 17539 days ago · 68 km deep · 95 km away
- 5.328 km ESE of Sulangan, Philippines · 17539 days ago · 70 km deep · 91 km away
Before
Earthquakes todayPhilippines earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000w4d. Read Tue, Sep 22, 2026, 2:33 AM UTC.