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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 1906年8月17日. Source: ⁨Peru–Chile Trench⁩. Documented deaths: 4,000.

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

マグニチュード

MW
M 8.2

30.09 Mt TNT

震源の深さ

35 km
35 km

intermediate (35–70 km（やや深い）)

PAGER影響評価

red
> 1,000 fatalities

負傷者数: > 5,000 · ~15.7M 人が体感

震央・断層インタラクティブマップ

32.40°S, 71.40°W
断層5 km
ペルー・チリ海溝
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
中部チリ（サンティアゴ・バルパライソ）
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%本震8月16日 15時8月17日 03時8月17日 15時8月18日 03時8月18日 15時8月19日 03時8月19日 15時8月20日 03時M8.2
Hover or tap a point to inspect aftershocks and risk probability curve.
<35 km (浅発・被害大)35–70 km（やや深い）>70 km (深発地震)本震

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 か所の集落

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).

地域地震プロファイル

中部チリ（サンティアゴ・バルパライソ）

このゾーンのリアルタイム地震モニタリング、過去の危険基準、断層すべりモデル、再来周期を表示。