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Seismic Event Dossier20:18 Local (12:18 UTC)(agora mesmo)

M 8.3 earthquake Philippine Sea (Philippines)

A magnitude 8.3 (MW) earthquake occurred on 1918-08-15, 20:18 local time (12:18 UTC) (agora mesmo), centered Philippine Sea (145 km SW of General Santos, Philippines). The hypocenter was located at a shallow depth of 20 km. Primary telemetry verified by USGS.

Historical Landmark Earthquake

#59 of All Time

Curated Global Seismic Archive (1700–Present)

Top-100 Earthquakes

A magnitude 8.3 earthquake struck ⁨Philippine Sea (Philippines)⁩ on 15 de agosto de 1918. Source: ⁨Cotabato Trench⁩. Documented deaths: 52.

Documented Fatalities52Source: NOAA NCEI Significant Earthquake Database
Fault KinematicsSubduction Megathrust
Equivalent Energy42.50 Mt TNT

Magnitude

MW
M 8.3

42.50 Mt TNT

Profundidade

20 km
20 km

shallow (Crosta superficial)

Impacto PAGER

red
> 1,000 fatalities

Feridos: > 5,000 · ~52.1M sentido

Mapa interativo do epicentro e das falhas

5.54°N, 123.99°E
Falha5 km
Cotabato Trench
Subduction Megathrust · ~15.0 mm/yr
Felt byMMI III+
~52.1M exposed
~28.9M strong shaking
Primary SolutionUSGS
USGS#iscgem913230reviewed
1 agencies reporting
Setting5.5°N
Ilha de Mindanau e fossa
Philippine Sea (No mar)

Seismic Activity & Aftershock Sequence

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

M0.0M4.5M9.0100%50%0%Sismo principal17 de ago.22 de ago.27 de ago.1 de set.6 de set.M8.3
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:12h41%24h56%72h72%7d90%

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
No tsunami threat
NOAA PTWC & regional buoys
Citizen Felt Reports
0
Not felt / offshore epicenter
Macroseismic DYFI verification
Aftershock Sequence
Aftershocks: 6
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
20.0 kmRef
5.54°, 123.99°Origin
Authoritative
iscgem913230

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
General Santos · South Cotabato145 kmMMI VIII
Cotabato · Shariff Kabunsuan189 kmMMI VII
Davao · Davao Del Sur252 kmMMI VII
Zamboanga · Zamboanga del Sur262 kmMMI VII
Pagadian · Zamboanga Del Sur263 kmMMI VII
Ozamis · Misamis Occidental291 kmMMI VII

Tectonic setting

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

Perfil sísmico regional

Ilha de Mindanau e fossa

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