M5.8 earthquake 20 km SE of Bangui, Philippines
A magnitude 5.8 earthquake struck 20 km SE of Bangui, Philippines on Sun, Sep 23, 1984, 5:18 AM GMT+8 (21:18 UTC), 46 km (29 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 5.8 (Mw, moment), moderate
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 1984-09-22 21:18:57 UTC
- Depth
- 46.2 km (28.7 mi), shallow
- Epicenter
- 18.424° N, 120.923° E
- Region
- Philippines
- Strongest shaking
- V, moderate 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 |
|---|---|---|---|
| 5.8 | Mw, moment | USGS National Earthquake Information Center | Preferred · Reviewed |
| 5.8 | Mw, moment | ISC-GEM global catalog | Final · ±0.1 |
| 5.8 | Mwc, centroid moment | Global CMT project | Preliminary |
What happened
The USGS’s account of the effects of this earthquake.
Felt (V RF) at Pasuquin, (IV RF) at Santa, and (III RF) at Baguio, Callao Caves and Tuguegarao. CENTROID, MOMENT TENSOR (HRV) Data Used: GDSN L.P.B.: 11S, 27C Centroid Location: Origin Time 21:19: 1.6 0.2 Lat 18.35N 0.03 Lon 120.85E 0.04 Dep 46.4 2.5 Half-duration 3.2 Moment Tensor; Scale 10**24 D-CM Mrr=4.51 0.21 Mtt=-1.81 0.21 Mff=-2.69 0.36 Mrt=-1.05 0.26 Mrf=-3.81 0.26 Mtf=-2.49 0.20 Principal Axes: (T) Val=6.15 Plg=67 Azm=90 (N) Val=-0.10 Plg=12 Azm=210 (P) Val=-6.05 Plg=19 Azm=305 Best Double Couple:Mo=6.1*10**24 NP1:Strike=55 Dip=28 Slip=117 NP2:Strike=205 Dip=66 Slip=76
From the USGS event page for usp00027m6. 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
- V, moderate shaking
- Peak ground acceleration
- 7.8% of gravity
- Peak ground velocity
- 1.4 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 2.8 and up: 1 in the 60 days after this one and 1 in the 30 days before it.
After
Before
Earthquakes todayPhilippines earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00027m6 (also filed as gcmtb092284e, gcmt19840922211858, atlas19840922211859, iscgem544960). Read Sat, Oct 3, 2026, 6:03 PM UTC.