In the morning of Wednesday October 28th, 2026, a significant M5.4 earthquake hit in the Philippine Sea 221 kilometer from Dededo Village, Guam. Such earthquakes in regions like this usually have a minimal impact on people and the economy.
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Earthquake Summary
This earthquake hit under water in the Philippine Sea, 196 kilometers (122 mi) off the coast of Guam, 221 kilometer southwest of Dededo Village in Dededo. The center of this earthquake had an intermediate depth of 101 km.
| Date and Time: | Oct 28, 2026 09:14 (Guam Time) - Oct 27, 2026 23:14 Universal Time. |
|---|---|
| Location: | 221 km SW of Dededo Village, Dededo, Guam. Coordinates 12°40'3"N 142°59'38"E. |
| Map: |  Map of area around epicenter. Click to open in Google Maps. |
| Magnitude: | MAG 5.4 Detected by 10 stations. Maximum Error Range ±0.098 . |
| Depth: | 101 km (63 mi) An intermediate depth. |
| Tsunami Risk: | Tsunami very unlikely Earthquakes under MAG-6.5 at depths deeper than 100km are very unlikely to cause tsunami's. Always stay cautious - More info here. |
Minimal impact predicted
Based on scientific estimates by the US Geographic Survey (USGS), the risk of high fatalities for this earthquake is classified at level GREEN (low). They expect an 99% likelyhood of between 0 and 1 fatalities.
The USGS classifies the economic impact of this earthquake at level GREEN (low). They expect an 99% likelyhood of between 0 and 1 million US Dollars in economic damage and impact.
Not many people felt this earthquake
| People | MMI Level | Shaking | Damage |
|---|---|---|---|
| 0 | I |
Not noticable | None |
| 0 | II |
Very weak | None |
| 0 | III |
Weak | Probably none |
| 0 | IV |
Light | Likely none |
| 0 | V |
Moderate | Very light |
| 0 | VI |
Strong | Light |
| 0 | VII |
Very Strong | Moderate |
| 0 | VIII |
Severe | Moderate to heavy |
| 0 | IX |
Violent | Heavy |
| 0 | X |
Extreme | Very heavy |
Nearby towns and cities
This earthquake may have been felt in Guam . Guam Government House in Hagatna, Guam is the nearest significant place from the epicenter. The earthquake occurred 210 kilometer (130 mi) southwest of Guam Government House.
The table below provides an overview of all places in proximity of today's earthquake.
Overview of nearby places
| Distance | Place |
|---|---|
| 210 km (130 mi) NE from epicenter |
Guam Government House Hagatna, Guam. |
| 210 km (130 mi) NE from epicenter |
Hagåtña Hagatna, Guam. |
| 214 km (133 mi) NE from epicenter |
Tamuning Tamuning, Guam. |
| 214 km (133 mi) NE from epicenter |
Tamuning-Tumon-Harmon Village Tamuning, Guam. |
| 214 km (133 mi) NE from epicenter |
Mangilao Village Mangilao, Guam. |
| 221 km (137 mi) NE from epicenter |
Dededo Village Dededo, Guam. |
| 227 km (141 mi) NE from epicenter |
Yigo Village Yigo, Guam. |
Earthquake Intensity Map
The maximum intensity (MMI Scale) caused by this earthquake is 0. The map below shows in which areas this earthquake was the most and least impactful. It is based on data from the US Geographic Survey.
Risk of aftershocks?
We monitor for foreshocks or aftershocks that have a magnitude of 2.5+ and occur within 100km (62 mi) of the epicenter of this earthquake. So far no such earthquakes have been detected.
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 February 12th, 2026, when a 5.4 magnitude earthquake hit 232 km (144 mi) further north-east. An even stronger magnitude 6 earthquake struck on November 4th, 2025.
In total, 36 earthquakes with a magnitude of 5.4 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 3 months.
Tsunami very unlikely
For a serious tsunami to occur, earthquakes usually need to have a magnitude of at least 6.5 and occur at a shallow depth of maximum 100km. Neither are the case with this earthquake. However always 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 5.4. Earthquakes of this strength are unlikely to trigger a tsunami. |
Not this earthquake. This earthquake occurred at a depth of 101 km (63 mi). Earthquakes this deep in the earth are unlikely to trigger a tsunami. |
Sources
Last updated 28/10/26 08:08 (). This article contains currently available information about the earthquake and is automatically composed. We continue to update this article up to a few days after the earthquake occurred.
- US Geographic Society (USGS): Earthquake us7000ttke
- European-Mediterranean Seismological Centre (EMSC): Earthquake 20261027_0000345
- Geonames.org: World Cities Database
- Google Maps: Static API
- Earthquakelist.org: Historic Earthquakes Database
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