M5.5 Earthquake 33 km WNW of Agat Village, Guam — January 21, 2025
2025-01-21 05:47:50 UTC (2025-01-21) · approx. 3:47 PM UTC+10 local
Felt by 45 people across nearby locations. Maximum shaking intensity MMI 4.9 (moderate).
On January 21, 2025 at 05:47 UTC, a magnitude 5.5 intermediate depth earthquake struck 33 km WNW of Agat Village, Guam, at a depth of 130.0 km and coordinates 13.4452°, 144.3602°. The earthquake was reported felt by 45 peopleacross nearby locations, with a maximum shaking intensity of Modified Mercalli Intensity (MMI) 4.9 (moderate). The USGS PAGER system issued a green alert level for this event, indicating no significant casualties or damage expected. This earthquake was detected by 114 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 485, placing it among routine seismic activity. The nearest populated place is Chalan Pago-Ordot Village (population 6,822).
Physical scale: An earthquake of magnitude 5.5 releases seismic energy equivalent to roughly 3 kilotons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 3.8 km — a useful intuition for the size of the slip patch on the fault.
Nearest Populated Places
ShakeMap — predicted shaking intensity
Modeled ground-motion intensity contoured on the Modified Mercalli scale (MMI). Computed by the USGS from the moment-tensor solution and regional ground-motion prediction equations.
Source: U.S. Geological Survey ShakeMap. View interactive ShakeMap on USGS
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 45 citizen responses to the USGS Did You Feel It? system. Each colored zone represents the average MMI from reports in that area.
Source: U.S. Geological Survey Did You Feel It?. View on USGS · submit your own report
Population exposure (USGS PAGER)
Estimated population that experienced each level of shaking. Based on the USGS PAGER rapid impact assessment, which combines ShakeMap output with global population grids.
| Shaking intensity (MMI) | Description | Population exposed |
|---|---|---|
| MMI 3 | weak | 24,973 |
| MMI 4 | light | 148,839 |
| MMI 5 | moderate | 26,691 |
Earthquake Details
144.3602°E
Technical Information
Common Questions
How strong was the magnitude 5.5 earthquake near Agat Village, Guam?
The magnitude 5.5 earthquake that struck 33 km WNW of Agat Village, Guam on January 21, 2025 at 05:47 UTC had a depth of 130.0 km. It was felt by 45 people with maximum shaking intensity of MMI 4.9 (moderate). For context, this was a moderate earthquake that could be widely felt.
Where did the earthquake occur?
The earthquake epicenter was located at 13.4452°, 144.3602°, which is 33 km WNW of Agat Village, Guam. The nearest populated place is Chalan Pago-Ordot Village (population 6,822).
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 5.5 earthquakes can continue for days to weeks and gradually diminish over time.
Actions
Authoritative source: USGS event page (event ID: us6000pldf). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, January 21, 2025). M5.5 Earthquake 33 km WNW of Agat Village, Guam — January 21, 2025. Retrieved January 21, 2026 from https://www.earthquaketracker.org/earthquakes/event/us6000pldf/