In the early morning of Saturday October 25th, 2025, a shallow Magnitude 4.9 earthquake hit in the North Pacific Ocean 154 kilometer from Dededo Village, Guam.
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Earthquake Summary
This earthquake hit under water in the North Pacific Ocean, 120 kilometers (75 mi) off the coast of Guam, 154 kilometer south-southwest of Dededo Village in Dededo. The center of this earthquake had a very shallow depth of 10 km. Shallow earthquakes usually have a larger impact than earthquakes deep in the earth.
| Date and Time: | Oct 25, 2025 05:04 (Guam Time) - Oct 24, 2025 19:04 Universal Time. |
|---|---|
| Location: | 154 km SSW of Dededo Village, Dededo, Guam. Coordinates 12°19'29"N 144°7'9"E. |
| Map: |  Map of area around epicenter. Click to open in Google Maps. |
| Magnitude: | MAG 4.9 Detected by 13 stations. Maximum Error Range ±0.086 . |
| Depth: | 10 km (6 mi) A very shallow depth. |
| Tsunami Risk: | Low tsunami risk Earthquakes under MAG-6.5 do not usually cause tsunami's. Always stay cautious - More info here. |
Nearby towns and cities
This earthquake may have been felt in Guam . Located 145 kilometer (90 mi) south-southwest of the epicenter of this earthquake, Hagåtña (Hagatna, Guam) is the nearest significant population center.
The table below provides an overview of all places in proximity of today's earthquake.
Overview of nearby places
| Distance | Place |
|---|---|
| 145 km (90 mi) NNE from epicenter |
Mangilao Village Mangilao, Guam. |
| 145 km (90 mi) NNE from epicenter |
Hagåtña Hagatna, Guam. |
| 145 km (90 mi) NNE from epicenter |
Guam Government House Hagatna, Guam. |
| 148 km (92 mi) NNE from epicenter |
Tamuning Tamuning, Guam. |
| 148 km (92 mi) NNE from epicenter |
Tamuning-Tumon-Harmon Village Tamuning, Guam. |
| 154 km (96 mi) NNE from epicenter |
Dededo Village Dededo, Guam. |
| 158 km (98 mi) NNE from epicenter |
Yigo Village Yigo, Guam. |
Risk of aftershocks?
This earthquake did not have any significant foreshocks nor aftershocks occurring within 100km (62 mi) of its epicenter.
The risk of aftershocks decreases rapidly over time. Usually, aftershocks are at least one order of magnitude lower than a main shock.
The chance that a significant earthquake like this one is followed by an even larger earthquake is not so large. On average, scientists estimate a 94% chance that a major earthquake will not be followed by an even larger one. It is still adviced to be aware of this risk
Read: How to Stay Safe during an Earthquake (cdc.gov).Earthquakes like this happen often in the region
Earthquakes of this strength are very common in the region. This is the strongest earthquake to hit since October 10th, 2025, when a 5.2 magnitude earthquake hit 282 km (175 mi) further west-southwest. An even stronger magnitude 6 earthquake struck on February 13th, 2022.
In total, 214 earthquakes with a magnitude of 4.9 or higher have been registered within 300km (186 mi) of this epicenter in the past 10 years. This comes down to an average of once every 17 days.
Low tsunami risk
Based on early data it appears this earthquake was not strong enough (lower than MAG-6.5) to be likely to cause destructive tsunami's. However this earthquake appeared to have hit at a shallow depth under sea, so stay cautious and monitor advice from local authorities.
Tsunami Risk Factors
| Factor | Under Sea? | MAG-6.5 or stronger? | Shallow depth? |
|---|---|---|---|
| Explanation | Almost all tsunami's are caused by earthquakes with their epicenter under sea or very near the sea. However stay cautious in coastal areas as earthquakes on land may cause landslides into sea, potentially still causing a local tsunami. | Under MAG 6.5: Very unlikely to cause a tsunami. MAG 6.5 to 7.5: Destructive tsunami's do occur, but are uncommon. Likely to observe small sea level changes. MAG 7.6+: Earthquakes with these magnitudes might produce destructive tsunami's. |
Most destructive tsunami's are caused by shallow earthquakes with a depth between 0 and 100km under the surface of the earth. Deeper tsunami's are unlikely to displace to ocean floor. |
| This Earthquake | This earthquake appears to have struck under the sea. | Not this earthquake. This earthquake had a magnitude of 4.9. Earthquakes of this strength are unlikely to trigger a tsunami. |
This earthquake occurred at a depth of of 10 km (6 mi). Earthquakes this shallow could trigger a tsunami. |
Sources
Last updated 08/11/25 20:28 (). This article is automatically generated based on available data. We keep checking multiple sources for additional information. This article gets updated as new details on this earthquake become available.
- US Geographic Society (USGS): Earthquake us6000rj9z
- European-Mediterranean Seismological Centre (EMSC): Earthquake 20251024_0000289
- Geonames.org: World Cities Database
- Google Maps: Static API
- Earthquakelist.org: Historic Earthquakes Database
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