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Seismic Event Dossier19:47 Local (22:47 UTC)(15221d atrás)

Earthquake near Valparaíso, Chile

A magnitude 8.0 (MW) earthquake occurred on 1985-03-03, 19:47 local time (22:47 UTC) (15221d atrás), 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

#66 of All Time

Curated Global Seismic Archive (1700–Present)

Top-100 Earthquakes
Magnitude 8.0 historical earthquake occurring on 1985-03-03 in Chile. Associated with the Unnamed Fault (Active Fault). Documented casualties: > 1,000.
Documented Fatalities> 1,000
Fault KinematicsActive Fault
Equivalent Energy15.08 Mt TNT

Magnitude

MW
M 8.0

15.08 Mt TNT

Profundidade

33 km
33 km

shallow (Crosta superficial)

Impacto PAGER

red
> 1,000 fatalities

Feridos: > 5,000 · ~14M sentido

Mapa interativo do epicentro e das falhas

33.13°S, 71.87°W
Falha5 km
Unnamed Fault
Active Fault · ~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 e 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 de mar.8 de mar.13 de mar.18 de mar.23 de mar.28 de mar.M8.0
Hover or tap a point to inspect aftershocks and risk probability curve.
<35 km (superficial)35–70 km (intermédio)>70 km (profundo)Sismo principal
Previsão de risco ML:12h40%24h54%72h69%7d87%

Verified Disaster & Impact Assessment

Official emergency management data cross-checked against multi-agency wires

Continuous verification
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

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 localidades

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: Unnamed Fault, 5 km away, slip rate ~15.0 mm/yr (GEM Global Active Faults).

Perfil sísmico regional

Chile Central (Santiago e Valparaíso)

Veja a monitorização sísmica em direto, referências históricas de perigo, modelos de deslizamento das falhas e intervalos de recorrência desta zona.