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M5.4 Earthquake — 193 km WSW of Merizo Village, Guam

M5.4 MODERATE
12.6981°N, 142.9431°E·US-GU
Started 1d ago
USGS data as of
Event Details
Typeearthquake
SeverityM5.4 MODERATE
Statusactive
Location12.6981°N, 142.9431°E (GU)
Started2026-10-27T23:14:16.76+00:00
Last Updated2026-10-28T23:10:38.21+00:00
Sourceusgs
Confidence1.00
Impact Zones — modeled
Affected Zone
Shaking felt. Minor damage possible in vulnerable structures.
206.4 km

Zone estimates are based on scientific models and may differ from actual local conditions.

Observed (NWS/USGS/NHC)
MMI 3 contour (ShakeMap v5, automatic)
USGS ShakeMap intensity contour · USGS ShakeMap
2026-10-27 23:14 UTCSource record
MMI 3.5 contour (ShakeMap v5, automatic)
USGS ShakeMap intensity contour · USGS ShakeMap
2026-10-27 23:14 UTCSource record

USGS ShakeMap shaking intensity, interpolated from seismic stations and felt reports with ground-motion-model fill where there are no stations. Observation-constrained, not a direct measurement at every point.

Impact Analysis
Population Exposed16,060,184
Structures in Zone1,595,723
Schools1
Fire Stations1

Population from ACS 5-Year 2022 tract sampling; structure counts from Microsoft Building Footprints or Census ACS housing data, capped by USGS NLCD 2021 developed land. Estimates for situational awareness — not for actuarial, regulatory, or underwriting use.

Historical Comparison
2024 GU Earthquake65% match

M5.5 Earthquake in GU, 147km from current event

GU
2002 GU Earthquake61% match

M5.4 Earthquake in GU, 167km from current event

GU
2000 GU Earthquake60% match

M5.4 Earthquake in GU, 174km from current event

GU

Historical comparison based on peril type, geography, and severity. Past events do not predict future outcomes.

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Zone estimates are based on scientific models and may differ from actual local conditions.