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Seismic Event Dossier01:46 Local (17:46 UTC)(الآن)

M 7.8 earthquake Negros Occidental, Philippines

A magnitude 7.8 (MW) earthquake occurred on 1948-01-24, 01:46 local time (17:46 UTC) (الآن), centered 82 km W of Bacolod (Philippines). The hypocenter was located at a shallow depth of 15 km. Primary telemetry verified by USGS.

Historical Landmark Earthquake

#91 of All Time

Curated Global Seismic Archive (1700–Present)

Top-100 Earthquakes

A magnitude 7.8 earthquake struck ⁨Negros Occidental, Philippines⁩ on 24 يناير 1948. Source: ⁨West Panay Fault⁩. Documented deaths: 74.

Documented Fatalities74Source: NOAA NCEI Significant Earthquake Database
Fault KinematicsActive Fault
Equivalent Energy7.56 Mt TNT

القدر

MW
M 7.8

7.56 Mt TNT

العمق

15 km
15 km

shallow (قشري ضحل)

أثر PAGER

red
> 1,000 fatalities

الإصابات المقدرة: > 5,000 · ~56.3M محسوس

خريطة تفاعلية للبؤرة السطحية والصدوع

10.71°N, 122.23°E
فالق5 km
West Panay Fault
Active Fault · ~15.0 mm/yr
Felt byMMI III+
~56.3M exposed
~11.2M strong shaking
Primary SolutionUSGS
USGS#iscgem897163reviewed
1 agencies reporting
Setting10.7°N
مينداناو جزيرة & خندق
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%الهزة الرئيسية27 يناير1 فبراير6 فبرايرM7.8
Hover or tap a point to inspect aftershocks and risk probability curve.
<35 كم (ضحل)35–70 كم (متوسط العمق)>70 كم (عميق)الهزة الرئيسية
توقعات مخاطر تعلم الآلة:12h35%24h47%72h61%7d76%

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: 2
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
M7.8(Mw)Ref
15.0 kmRef
10.71°, 122.23°Origin
Authoritative
iscgem897163

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 تجمعات سكانية

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

TownDistanceIntensity
Iloilo · Iloilo34 kmMMI IX
Bacolod · Negros Occidental82 kmMMI VIII
Roxas · Capiz112 kmMMI VIII
Cadiz · Negros Occidental120 kmMMI VII
Cebu · Cebu187 kmMMI VII
Ormac · Leyte262 kmMMI VI

Tectonic setting

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

الملف الزلزالي الإقليمي

مينداناو جزيرة & خندق

استعرض المراقبة الزلزالية الحية، ومعايير الخطر التاريخية، ونماذج انزلاق الفوالق وفترات التكرار لهذه المنطقة.