M5.1 earthquake 60 km WSW of Pagar Alam, Indonesia
A magnitude 5.1 earthquake struck 60 km WSW of Pagar Alam, Indonesia on Thu, Jan 1, 1987, 2:19 AM GMT+7 (19:19 UTC), 89 km (55 mi) below the surface.
A larger quake followed: M5.4 99 km S of Pagar Alam, Indonesia. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 5.1 (Mw, moment), moderate
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 1986-12-31 19:19:24 UTC
- Depth
- 89.3 km (55.5 mi), intermediate-depth
- Epicenter
- 4.300° S, 102.772° E
- Region
- Indonesia
- 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 | Mw, 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.
CENTROID, MOMENT TENSOR (HRV) Data Used: GDSN L.P.B.: 9S, 18C Centroid Location: Origin Time 19:19:28.7 1.0 Lat 4.65S 0.08 Lon 103.02E 0.14 Dep 60.2 8.5 Half-duration 1.4 Moment Tensor; Scale 10**23 D-CM Mrr=4.06 0.69 Mtt=-3.50 0.76 Mff=-0.57 1.35 Mrt=2.03 0.82 Mrf=-1.38 0.67 Mtf=1.07 0.60 Principal Axes: (T) Val=4.80 Plg=73 Azm=45 (N) Val=-0.29 Plg=7 Azm=292 (P) Val=-4.51 Plg=15 Azm=200 Best Double Couple:Mo=4.6*10**23 NP1:Strike=280 Dip=30 Slip=76 NP2:Strike=115 Dip=61 Slip=98
From the USGS event page for usp00031ak. 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 2.1 and up: 3 in the 60 days after this one and 0 in the 30 days before it.
After
Earthquakes todayIndonesia earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00031ak (also filed as gcmtb123186b, gcmt19861231191921, iscgem479581). Read Sun, Oct 4, 2026, 3:33 PM UTC.