M4.0 earthquake 76 km E of Union, Philippines
A magnitude 4.0 earthquake struck 76 km E of Union, Philippines on Fri, Oct 17, 2003, 2:09 AM GMT+8 (18:09 UTC), 33 km (21 mi) below the surface.
A larger quake followed: M4.8 33 km ESE 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
- 4.0 (mb, body-wave), light
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 2003-10-16 18:09:18 UTC
- Depth
- 33.0 km (20.5 mi), shallow
- Epicenter
- 9.664° N, 126.800° E
- Region
- Philippines
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
What happened
The USGS’s account of the effects of this earthquake.
no people dead or missing; no people injured; no buildings damaged or destroyed
From the USGS event page for usp000cahx. U.S. Geological Survey text and figures are in the public domain.
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
- Station coverage gap
- 90°
- Stations used
- 21
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 3 in the 60 days after this one and 8 in the 30 days before it.
After
- 4.229 km NNE of Cortes, Philippines · 8368 days ago · 33 km deep · 60 km away
- 4.833 km ESE of Union, Philippines · 8357 days ago · 33 km deep · 44 km away
- 4.580 km ENE of Aras-asan, Philippines · 8355 days ago · 33 km deep · 62 km away
Before
- 4.194 km E of Union, Philippines · 8386 days ago · 33 km deep · 25 km away
- 4.545 km E of Union, Philippines · 8387 days ago · 33 km deep · 31 km away
- 4.412 km N of Santa Monica, Philippines · 8389 days ago · 76 km deep · 96 km away
- 4.338 km ESE of Union, Philippines · 8390 days ago · 68 km deep · 39 km away
- 4.265 km E of Union, Philippines · 8390 days ago · 54 km deep · 13 km away
- 4.824 km E of Cortes, Philippines · 8390 days ago · 68 km deep · 58 km away
- 4.768 km E of Union, Philippines · 8391 days ago · 33 km deep · 21 km away
- 4.481 km E of Cortes, Philippines · 8403 days ago · 33 km deep · 31 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp000cahx. Read Thu, Oct 1, 2026, 8:04 AM UTC.