M5.5 earthquake 12 km SSE of Lapinigan, Philippines
A magnitude 5.5 earthquake struck 12 km SSE of Lapinigan, Philippines on Fri, Nov 2, 1984, 12:50 PM GMT+8 (04:50 UTC), 28 km (17 mi) below the surface.
A larger quake followed: M5.7 11 km NE of Bunawan, Philippines. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 5.5 (Mw, moment), moderate
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 1984-11-02 04:50:07 UTC
- Depth
- 27.6 km (17.1 mi), shallow
- Epicenter
- 8.319° N, 126.035° E
- Region
- Philippines
- Strongest shaking
- VI, strong shaking
- 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 |
|---|---|---|---|
| 5.5 | Mw, moment | USGS National Earthquake Information Center | Preferred · Reviewed |
| 5.5 | Mw, moment | ISC-GEM global catalog | Final · ±0.1 |
| 5.5 | 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.: 10S, 15C Centroid Location: Origin Time 04:50:10.8 0.6 Lat 8.22N 0.07 Lon 126.40E 0.09 Dep 29.0 7.6 Half-duration 1.9 Moment Tensor; Scale 10**24 D-CM Mrr=0.00 0.13 Mtt=1.75 0.14 Mff=-1.75 0.25 Mrt=-0.46 0.37 Mrf=-1.28 0.39 Mtf=0.16 0.11 Principal Axes: (T) Val=1.94 Plg=19 Azm=171 (N) Val=0.49 Plg=55 Azm=51 (P) Val=-2.43 Plg=28 Azm=271 Best Double Couple:Mo=2.2*10**24 NP1:Strike=309 Dip=56 Slip=-7 NP2:Strike=43 Dip=84 Slip=-146
From the USGS event page for usp00028qm. U.S. Geological Survey text and figures are in the public domain.
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
- 15.9% of gravity
- Peak ground velocity
- 2.3 cm/s
- Map
- Automatic
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 2.5 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 usp00028qm (also filed as gcmtb110284c, gcmt19841102045008, iscgem538183, atlas19841102045007). Read Sat, Oct 3, 2026, 5:21 PM UTC.