M5.9 earthquake West Chile Rise
A magnitude 5.9 earthquake struck in the West Chile Rise on Mon, Aug 5, 1985, 8:29 PM GMT-6 (02:29 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
- 5.9 (Mw, moment), moderate
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 1985-08-06 02:29:44 UTC
- Depth
- 10.0 km (6.2 mi), shallow
- Epicenter
- 41.192° S, 85.894° W
- Region
- Chile
- 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 |
|---|---|---|---|
| 5.9 | Mw, moment | USGS National Earthquake Information Center | Preferred · Reviewed |
| 5.91 | Mw, moment | ISC-GEM global catalog | Final · ±0.1 |
| 5.9 | 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.: 16S, 41C Centroid Location: Origin Time 02:29:49.5 0.1 Lat 41.29S 0.02 Lon 85.88W 0.03 Dep 10.0 FIX Half-duration 3.4 Moment Tensor; Scale 10**24 D-CM Mrr=-1.21 0.15 Mtt=2.45 0.14 Mff=-1.23 0.18 Mrt=-0.62 0.50 Mrf=-1.20 0.46 Mtf=-8.57 0.17 Principal Axes: (T) Val=9.38 Plg=2 Azm=39 (N) Val=-0.98 Plg=79 Azm=137 (P) Val=-8.40 Plg=10 Azm=309 Best Double Couple:Mo=8.9*10**24 NP1:Strike=84 Dip=82 Slip=-174 NP2:Strike=353 Dip=84 Slip=-8
From the USGS event page for usp0002he7. 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.
How well it is located
Reviewed by a seismologist.
- Depth from
- OPERATOR_ASSIGNED
Nearby
Within 100 km, magnitude 2.9 and up: 0 in the 60 days after this one and 1 in the 30 days before it.
Before
Earthquakes todayChile earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0002he7 (also filed as gcmtb080685b, gcmt19850806022944, iscgem517429). Read Thu, Oct 1, 2026, 2:02 PM UTC.