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Seismic Event Dossier01:46 Local (17:46 UTC)(78y ago)

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) (78y ago), 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 1948年1月24日. Source: ⁨West Panay Fault⁩. Documented deaths: 74.

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

震级

MW
M 7.8

7.56 Mt TNT

深度

15 km
15 km

shallow (浅层地壳)

PAGER 影响评估

red
> 1,000 fatalities

受伤人数: > 5,000 · ~56.3M 人有感

交互式震中与断层地图

10.71°N, 122.23°E
断层5 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
棉兰老岛与海沟
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%主震1月27日2月1日2月6日M7.8
Hover or tap a point to inspect aftershocks and risk probability curve.
<35 公里（浅源）35–70 公里（中源）>70 公里（深源）主震
机器学习风险预测: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 个居民点

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).

区域地震特征档案

棉兰老岛与海沟

查看该区域的实时地震监测、历史危险基准、断层滑动模型以及复发周期评估。