メインコンテンツへ移動
Open on Live Map
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 1985年3月3日. Source: ⁨Peru–Chile Trench⁩. Documented deaths: 180.

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

マグニチュード

MW
M 8.0

15.08 Mt TNT

震源の深さ

33 km
33 km

shallow (浅発・地殻内)

PAGER影響評価

red
> 1,000 fatalities

負傷者数: > 5,000 · ~14M 人が体感

震央・断層インタラクティブマップ

33.13°S, 71.87°W
断層5 km
ペルー・チリ海溝
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
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3月3日3月8日3月13日3月18日3月23日3月28日M8.0
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
MLリスク予測: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 か所の集落

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).

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。