M5.7 earthquake 39 km SW of Valparaíso, Chile
A magnitude 5.7 earthquake struck 39 km SW of Valparaíso, Chile on Mon, Jul 28, 1986, 4:29 PM GMT-4 (20:29 UTC), 41 km (25 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 5.7 (Mw, moment), moderate
- Magnitude from
- USGS National Earthquake Information Center
- Local time
- UTC
- 1986-07-28 20:29:02 UTC
- Depth
- 40.7 km (25.3 mi), shallow
- Epicenter
- 33.282° S, 71.934° W
- Region
- Chile
- Strongest shaking
- IV, light 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 |
|---|---|---|---|
| 5.7 | Mw, moment | USGS National Earthquake Information Center | Preferred · Reviewed |
| 5.69 | Mw, moment | ISC-GEM global catalog | Final · ±0.1 |
| 5.7 | Mwc, centroid moment | Global CMT project | Preliminary |
What happened
The USGS’s account of the effects of this earthquake.
Felt (IV) at Santo Domingo, Quillota, Vina del Mar and San Antonio, and (III) at Santiago and Valparaiso. CENTROID, MOMENT TENSOR (HRV) Data Used: GDSN L.P.B.: 16S, 32C Centroid Location: Origin Time 20:29: 5.8 0.3 Lat 33.53S 0.05 Lon 72.47W 0.04 Dep 18.2 2.1 Half-duration 2.6 Moment Tensor; Scale 10**24 D-CM Mrr=2.80 0.10 Mtt=0.23 0.11 Mff=-3.03 0.15 Mrt=0.40 0.22 Mrf=-3.05 0.45 Mtf=0.06 0.11 Principal Axes: (T) Val=4.13 Plg=66 Azm=77 (N) Val=0.21 Plg=4 Azm=176 (P) Val=-4.34 Plg=23 Azm=267 Best Double Couple:Mo=4.2*10**24 NP1:Strike=4 Dip=22 Slip=100 NP2:Strike=174 Dip=68 Slip=86
From the USGS event page for usp0002wn0. 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
- IV, light shaking
- Peak ground acceleration
- 5.3% of gravity
- Peak ground velocity
- 0.9 cm/s
- Map
- Automatic
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
- FROM_LOCATION
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 2.7 and up: 7 in the 60 days after this one and 3 in the 30 days before it.
After
- 5.147 km NW of Cartagena, Chile · 14676 days ago · 45 km deep · 10 km away
- 4.348 km W of San Antonio, Chile · 14676 days ago · 33 km deep · 41 km away
- 4.376 km W of Cartagena, Chile · 14675 days ago · 33 km deep · 47 km away
- 4.169 km W of Cartagena, Chile · 14675 days ago · 12 km deep · 46 km away
- 4.364 km W of San Antonio, Chile · 14644 days ago · 33 km deep · 49 km away
- 4.257 km SSW of San Antonio, Chile · 14628 days ago · 33 km deep · 83 km away
- 4.065 km WNW of Cartagena, Chile · 14625 days ago · 33 km deep · 38 km away
Before
Earthquakes todayChile earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0002wn0 (also filed as gcmtb072886b, gcmt19860728202901, iscgem491924). Read Fri, Oct 2, 2026, 1:26 PM UTC.