M6.3 earthquake 29 km WSW of Union, Philippines
A magnitude 6.3 earthquake struck 29 km WSW of Union, Philippines on Wed, Oct 22, 1975, 7:06 AM GMT+8 (23:06 UTC), 33 km (21 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 6.3 (ms), strong
- Local time
- UTC
- 1975-10-21 23:06:22 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 11.661° N, 121.646° E
- Region
- Philippines
- Strongest shaking
- VI, strong shaking
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
Shaking
The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.
- Strongest estimated
- VI, strong shaking
- Peak ground acceleration
- 10.8% of gravity
- Peak ground velocity
- 2.4 cm/s
- Map
- Automatic
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
- 112
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 2.5 and up: 2 in the 60 days after this one and 2 in the 30 days before it.
After
- 5.827 km WSW of Union, Philippines · 18599 days ago · 33 km deep · 3 km away
- 4.522 km E of Jarigue, Philippines · 18599 days ago · 60 km deep · 20 km away
Before
Earthquakes todayPhilippines earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000d7x (also filed as atlas19751021230620, iscgem723141). Read Wed, Sep 23, 2026, 2:00 PM UTC.