M6.1 earthquake 17 km WSW of Union, Philippines
A magnitude 6.1 earthquake struck 17 km WSW of Union, Philippines on Wed, Oct 22, 1975, 1:12 AM GMT+8 (17:12 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M6.3 29 km WSW of Union, Philippines. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 6.1 (ms), strong
- Local time
- UTC
- 1975-10-21 17:12:23 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 11.707° N, 121.750° 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
- 2.2 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
- 128
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 3.1 and up: 4 in the 60 days after this one and 0 in the 30 days before it.
After
- 5.430 km SE of Jarigue, Philippines · 18604 days ago · 33 km deep · 18 km away
- 6.329 km WSW of Union, Philippines · 18604 days ago · 33 km deep · 12 km away
- 5.827 km WSW of Union, Philippines · 18603 days ago · 33 km deep · 11 km away
- 4.522 km E of Jarigue, Philippines · 18603 days ago · 60 km deep · 19 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0000d7q (also filed as atlas19751021171223, iscgem723130). Read Sun, Sep 27, 2026, 8:43 PM UTC.