M5.3 earthquake 30 km ENE of Nangan, Philippines
A magnitude 5.3 earthquake struck 30 km ENE of Nangan, Philippines on Sat, Aug 18, 1984, 5:14 PM GMT+8 (09:14 UTC), 85 km (53 mi) below the surface.
A larger quake followed: M5.4 16 km ESE of San Ignacio, Philippines. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 5.3 (Mw, moment), moderate
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 1984-08-18 09:14:30 UTC
- Depth
- 85.3 km (53.0 mi), intermediate-depth
- Epicenter
- 6.569° N, 126.384° 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 |
|---|---|---|---|
| 5.3 | Mw, moment | USGS National Earthquake Information Center | Preferred · Reviewed |
| 5.29 | Mw, moment | ISC-GEM global catalog | Final · ±0.1 |
| 5.3 | Mwc, centroid moment | Global CMT project | Preliminary |
What happened
The USGS’s account of the effects of this earthquake.
CENTROID, MOMENT TENSOR (HRV) Data Used: GDSN L.P.B.: 7S, 7C Centroid Location: Origin Time 09:14:34.5 1.0 Lat 6.35N 0.13 Lon 126.50E 0.10 Dep 104.9 6.8 Half-duration 1.5 Moment Tensor; Scale 10**24 D-CM Mrr=0.34 0.07 Mtt=0.72 0.13 Mff=-1.06 0.16 Mrt=-0.44 0.06 Mrf=0.00 0.10 Mtf=-0.26 0.13 Principal Axes: (T) Val=1.03 Plg=32 Azm=187 (N) Val=0.07 Plg=58 Azm=13 (P) Val=-1.10 Plg=3 Azm=279 Best Double Couple:Mo=1.1*10**24 NP1:Strike=328 Dip=66 Slip=22 NP2:Strike=228 Dip=70 Slip=154
From the USGS event page for usp00026gr. 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.
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 2.3 and up: 2 in the 60 days after this one and 0 in the 30 days before it.
After
Earthquakes todayPhilippines earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00026gr (also filed as gcmtb081884c, gcmt19840818091430, iscgem547069). Read Thu, Oct 1, 2026, 1:02 PM UTC.