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Seismic Event Dossier19:47 Local (22:47 UTC)(41y ago)

M 8.0 earthquake Valparaíso, Chile

A magnitude 8.0 (MW) earthquake occurred on 1985-03-03, 19:47 local time (22:47 UTC) (41y ago), centered 25 km SW of Valparaíso (Chile). The hypocenter was located at a shallow depth of 33 km. Primary telemetry verified by USGS.

Historical Landmark Earthquake

#65 of All Time

Curated Global Seismic Archive (1700–Present)

Top-100 Earthquakes

A magnitude 8.0 earthquake struck ⁨Valparaíso, Chile⁩ on 3 de marzo de 1985. Source: ⁨Peru–Chile Trench⁩. Documented deaths: 180.

Documented Fatalities180Source: NOAA NCEI Significant Earthquake Database
Fault KinematicsSubduction Megathrust
Equivalent Energy15.08 Mt TNT

Magnitud

MW
M 8.0

15.08 Mt TNT

Profundidad

33 km
33 km

shallow (Cortical superficial)

Impacto PAGER

red
> 1,000 fatalities

Heridos: > 5,000 · ~14M lo sintieron

Mapa interactivo de epicentro y fallas

33.13°S, 71.87°W
Falla5 km
Fosa de Perú-Chile
Subduction Megathrust · ~15.0 mm/yr
Felt byMMI III+
~14M exposed
~8.5M strong shaking
Primary SolutionUSGS
USGS#usp0002cczreviewed
1 agencies reporting
Setting33.1°S
Chile Central (Santiago y Valparaíso)
Continental / Inland crustal

Seismic Activity & Aftershock Sequence

Timeline of foreshocks, main rupture, aftershocks and machine learning risk probability evolution.

M0.0M4.5M9.0100%50%0%Sismo principal3 mar8 mar13 mar18 mar23 mar28 marM8.0
Hover or tap a point to inspect aftershocks and risk probability curve.
<35 km (Superficial / Destructivo)35–70 km (Intermedio)>70 km (Profundo)Sismo principal
Pronóstico de riesgo ML:12h40%24h54%72h69%7d87%

Situation Monitoring

Continuous verification
Multi-agency verification of casualties, tsunami alerts, and seismic sequence

Key facts so far

Casualties
Damage assessment in progress
Tsunami Status
No tsunami threat
NOAA PTWC & regional buoys
Citizen Felt Reports
0
No felt reports submitted
Macroseismic DYFI verification
Aftershock Sequence
Aftershocks: 50
High Omori aftershock probability
LightGBM hazard model forecast
Multi-agency seismic telemetry active. Awaiting wire headlines.

Agency Discrepancy Matrix (Cross-Network Verification)

Comparing multi-network solutions from primary and teleseismic monitoring agencies.

Network / SourceMagnitude (Scale & Diff)Depth & DiffEpicenter & Shift (Δd)ConsensusEvent ID / Data
USGS
United States Geological Survey · Global / US
M8.0(Mw)Ref
33.0 kmRef
-33.13°, -71.87°Origin
Authoritative
usp0002ccz

Why do agency magnitudes differ? Seismological agencies use different instrumentation networks, crustal velocity models, and mathematical magnitude scales (e.g. Moment Magnitude Mw vs Local Richter ML vs Surface Wave Ms). Differences of 0.1–0.3 are common and reflect physical observation geometry rather than errors.

Where it was felt

6 poblaciones

Shaking intensity is modelled from magnitude, depth and distance (GMPE attenuation), not reported by residents.

TownDistanceIntensity
Valparaíso · Valparaíso25 kmMMI IX
Viña del Mar · Valparaíso33 kmMMI IX
San Antonio · Valparaíso57 kmMMI IX
Quillota · Valparaíso64 kmMMI IX
La Ligua · Valparaíso96 kmMMI VIII
San Felipe · Valparaíso116 kmMMI VIII

Tectonic setting

Nearest mapped active fault: Peru–Chile Trench, 5 km away, slip rate ~15.0 mm/yr (GEM Global Active Faults).

Perfil sísmico regional

Chile Central (Santiago y Valparaíso)

Vea el monitoreo sísmico en vivo, referencias históricas de peligro, modelos de deslizamiento de fallas e intervalos de recurrencia para esta zona.