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HISTORICAL TSUNAMI RECORDSeptember 17, 2015

Major Ocean Tsunami Generated (Historical Record)

This undersea earthquake generated recorded tsunami waves across coastal and trans-oceanic sectors. Preserved in seismic archive for scientific reference — no active hazard exists.

Seismic Event Dossier19:54 Local (22:54 UTC)(11y ago)

M 8.3 earthquake Off the coast of Viña del Mar, Chile

A magnitude 8.3 (MW) earthquake occurred on 2015-09-16, 19:54 local time (22:54 UTC) (11y ago), centered Off the coast of Viña del Mar (163 km N, Chile). The hypocenter was located at a shallow depth of 22.4 km. Primary telemetry verified by USGS.

Historical Landmark Earthquake

#58 of All Time

Curated Global Seismic Archive (1700–Present)

Top-100 Earthquakes

A magnitude 8.3 earthquake struck ⁨Off the coast of Viña del Mar, Chile⁩ on 16 tháng 9, 2015. Source: ⁨Peru–Chile Trench⁩. Documented deaths: 15.

Documented Fatalities15Source: NOAA NCEI Significant Earthquake Database
Fault KinematicsSubduction Megathrust
Equivalent Energy42.50 Mt TNT

Độ lớn

MW
M 8.3

42.50 Mt TNT

Độ sâu

22.4 km
22.4 km

shallow (Vỏ Trái Đất nông)

Tác động PAGER

red
> 1,000 fatalities

Người bị thương: > 5,000 · ~15.8M cảm nhận được

Bản đồ Tâm chấn & Đứt gãy Tương tác

31.57°S, 71.67°W
Đứt gãy5 km
Rãnh Peru–Chile
Subduction Megathrust · ~15.0 mm/yr
Felt byMMI III+
~15.8M exposed
~10.5M strong shaking
Primary SolutionUSGS
USGS#us20003k7areviewed
1 agencies reporting
Setting31.6°S
Miền Trung Chile (Santiago & Valparaíso)
Offshore / Marine rupture

Seismic Activity & Aftershock Sequence

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

M0.0M4.5M9.0100%50%0%Chấn động chính17 thg 922 thg 927 thg 92 thg 107 thg 1012 thg 10M8.3
Hover or tap a point to inspect aftershocks and risk probability curve.
<35 km (Nông)35–70 km (Trung bình)>70 km (Sâu)Chấn động chính
Dự báo Nguy cơ ML:12h41%24h55%72h71%7d89%

Situation Monitoring

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

Key facts so far

Casualties
None expected (offshore epicenter)
Zero exposed population
Tsunami Status
TSUNAMI WARNING
NOAA PTWC & regional buoys
Citizen Felt Reports
0
Not felt / offshore epicenter
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
M8.3(Mw)Ref
22.4 kmRef
-31.57°, -71.67°Origin
Authoritative
us20003k7a

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 khu dân cư

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

TownDistanceIntensity
Illapel · Coquimbo48 kmMMI IX
Salamanca · Coquimbo70 kmMMI IX
La Ligua · Valparaíso107 kmMMI VIII
Ovalle · Coquimbo118 kmMMI VIII
Quillota · Valparaíso151 kmMMI VIII
San Felipe · Valparaíso159 kmMMI VIII

Tectonic setting

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

Hồ sơ Địa chấn Khu vực

Miền Trung Chile (Santiago & Valparaíso)

Xem giám sát địa chấn trực tiếp, các chỉ số hiểm họa lịch sử, mô hình trượt đứt gãy và chu kỳ lặp lại cho vùng này.