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Seismic Event Dossier20:18 Local (12:18 UTC)(à l'instant)

Earthquake near Philippine Sea (Philippines)

A magnitude 8.3 (MW) earthquake occurred on 1918-08-15, 20:18 local time (12:18 UTC) (à l'instant), 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

#20 of All Time

Curated Global Seismic Archive (1700–Present)

Top-100 Earthquakes
Magnitude 8.3 historical earthquake occurring on 1918-08-15 in Philippines. Associated with the Unnamed Fault (Active Fault). Documented casualties: > 1,000.
Documented Fatalities> 1,000
Fault KinematicsActive Fault
Equivalent Energy42.50 Mt TNT

Magnitude

MW
M 8.3

42.50 Mt TNT

Profondeur

20 km
20 km

shallow (Croûte superficielle)

Impact PAGER

red
> 1,000 fatalities

Blessés: > 5,000 · ~52.1M ressenti

Carte interactive de l'épicentre et des failles

5.54°N, 123.99°E
Faille5 km
Unnamed Fault
Active Fault · ~15.0 mm/yr
Felt byMMI III+
~52.1M exposed
~28.9M strong shaking
Primary SolutionUSGS
USGS#iscgem913230reviewed
1 agencies reporting
Setting5.5°N
Île de Mindanao et fosse
Philippine Sea (En mer)

Seismic Activity & Aftershock Sequence

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

M0.0M4.5M9.0100%50%0%Choc principal17 août22 août27 août1 sept.6 sept.M8.3
Hover or tap a point to inspect aftershocks and risk probability curve.
<35 km (superficiel)35–70 km (intermédiaire)>70 km (profond)Choc principal
Prévision de risque ML:12h41%24h56%72h72%7d90%

Verified Disaster & Impact Assessment

Official emergency management data cross-checked against multi-agency wires

Continuous verification
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

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 localités

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: Unnamed Fault, 5 km away, slip rate ~15.0 mm/yr (GEM Global Active Faults).

Profil sismique régional

Île de Mindanao et fosse

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.