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Seismic Event Dossier19:57 Local (00:40 UTC)(120y ago)

M 8.2 earthquake Valparaíso, Chile

A magnitude 8.2 (MW) earthquake occurred on 1906-08-17, 19:57 local time (00:40 UTC) (120y ago), centered 71 km N of Viña del Mar (Chile). The hypocenter was located at a intermediate depth of 35 km. Primary telemetry verified by USGS.

Historical Landmark Earthquake

#28 of All Time

Curated Global Seismic Archive (1700–Present)

Top-100 Earthquakes

A magnitude 8.2 earthquake struck ⁨Valparaíso, Chile⁩ on 17 août 1906. Source: ⁨Peru–Chile Trench⁩. Documented deaths: 4,000.

Documented Fatalities4,000Source: NOAA NCEI Significant Earthquake Database
Fault KinematicsSubduction Megathrust
Equivalent Energy30.09 Mt TNT

Magnitude

MW
M 8.2

30.09 Mt TNT

Profondeur

35 km
35 km

intermediate (35–70 km (intermédiaire))

Impact PAGER

red
> 1,000 fatalities

Blessés: > 5,000 · ~15.7M ressenti

Carte interactive de l'épicentre et des failles

32.40°S, 71.40°W
Faille5 km
Fosse du Pérou-Chili
Subduction Megathrust · ~15.0 mm/yr
Felt byMMI III+
~15.7M exposed
~10.4M strong shaking
Primary SolutionUSGS
USGS#iscgemsup16957911reviewed
1 agencies reporting
Setting32.4°S
Chili central (Santiago et 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%Choc principal16 août, 15 h17 août, 03 h17 août, 15 h18 août, 03 h18 août, 15 h19 août, 03 h19 août, 15 h20 août, 03 hM8.2
Hover or tap a point to inspect aftershocks and risk probability curve.
<35 km (superficiel)35–70 km (intermédiaire)>70 km (profond)Choc principal

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
Monitoring
Aftershocks expected (Omori law)
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
M8.2(Mw)Ref
35.0 kmRef
-32.40°, -71.40°Origin
Authoritative
iscgemsup16957911

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 localités

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

TownDistanceIntensity
La Ligua · Valparaíso16 kmMMI X
Quillota · Valparaíso55 kmMMI IX
Viña del Mar · Valparaíso71 kmMMI IX
San Felipe · Valparaíso75 kmMMI IX
Valparaíso · Valparaíso75 kmMMI IX
Salamanca · Coquimbo80 kmMMI IX

Tectonic setting

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

Profil sismique régional

Chili central (Santiago et Valparaíso)

Consultez la surveillance sismique en direct, les références historiques de danger, les modèles de glissement des failles et les intervalles de récurrence pour cette zone.