M5.1 earthquake 16 km SW of San Alfonso, Philippines
A magnitude 5.1 earthquake struck 16 km SW of San Alfonso, Philippines on Mon, May 17, 2004, 4:11 PM GMT+8 (08:11 UTC), 10 km (6 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 5.1 (Mwc, centroid moment), moderate
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 2004-05-17 08:11:45 UTC
- Depth
- 10.0 km (6.2 mi), shallow
- Epicenter
- 7.687° N, 126.303° E
- Region
- Philippines
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
Magnitude estimates
Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.
| Mag. | Scale | Computed by | Notes |
|---|---|---|---|
| 5.1 | Mwc, centroid moment | USGS National Earthquake Information Center | Preferred · Reviewed |
| 5.04 | Mw, moment | ISC-GEM global catalog | Final · ±0.1 |
| 5.0 | Mwc, centroid moment | Global CMT project | Preliminary |
What happened
The USGS’s account of the effects of this earthquake.
Felt (III PIVS) in Compostela and (II PIVS) at Bislig.
From the USGS event page for usp000cvap. 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.
Fault motion and ground failure
How the rock slipped, from the moment tensor, and the USGS estimate of landslides and liquefaction.
- Faulting
- Normal
- Nodal plane 1
- Strike 118°, dip 43°, rake -100°
- Nodal plane 2
- Strike 311°, dip 48°, rake -81°
How well it is located
Reviewed by a seismologist.
- Depth from
- OPERATOR_ASSIGNED
- Station coverage gap
- 85°
- Stations used
- 84
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 2.1 and up: 2 in the 60 days after this one and 2 in the 30 days before it.
After
- 4.39 km ENE of Bantacan, Philippines · 8168 days ago · 88 km deep · 12 km away
- 4.711 km WNW of Batiano, Philippines · 8168 days ago · 74 km deep · 15 km away
Before
Earthquakes todayPhilippines earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp000cvap (also filed as gcmtc051704a, gcmt20040517081145, iscgem7344263). Read Thu, Oct 1, 2026, 7:26 AM UTC.