In the early morning of Tuesday June 24th, 2025, a significant MAG-5.4 earthquake hit in the Philippine Sea 34 kilometer from Dededo Village, Guam. Roughly 230 thousand people may have felt this earthquake. Another country near the epicenter is Northern Mariana Islands.
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Earthquake Summary
This earthquake hit under water in the Philippine Sea, 25 kilometers (15 mi) off the coast of Guam, 34 kilometer north-northwest of Dededo Village in Dededo. The center of this earthquake had an intermediate depth of 146 km.
| Date and Time: | Jun 24, 2025 05:14 (Guam Time) - Jun 23, 2025 19:14 Universal Time. |
|---|---|
| Location: | 34 km NNW of Dededo Village, Dededo, Guam. Coordinates 13°47'23"N 144°41'7"E. |
| Map: |  Map of area around epicenter. Click to open in Google Maps. |
| Magnitude: | MAG 5.4 Detected by 26 stations. Maximum Error Range ±0.061 . |
| Depth: | 146 km (91 mi) An intermediate depth. |
| Max. Intensity: | IV
Light On the Modified Mercalli Scale. |
| 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 65% likelyhood of between 0 and 1 fatalities, and a 96% chance that the number of fatalities falls no higher than 10.
The USGS classifies the economic impact of this earthquake at level GREEN (low). They expect an 65% likelyhood of between 0 and 1 million US Dollars in economic damage and impact, and a 96% chance that the economic impact of this earthquake falls no higher than 10 million USD.
Roughly 230 thousand people exposed to shaking
This earthquake may have been felt by around 230 thousand people. That is the expected population size of the area exposed to a level of shaking of II or higher on the Modified Mercalli scale according to the USGS.
The highest earthquake impact level for this earthquake is IV, which corresponds with light shaking and likely no damage. Roughly 11,480 people are expected to be exposed to this level. Intensity level III was experienced by the majority of people (around 210 thousand). In their region, weak shaking and probably no damage can be expected.
People in 2 countries have been exposed to shaking. In Guam , around 170 thousand people, with impact levels up to IV (light shaking, likely no damage). In Northern Mariana Islands , around 50 thousand people.
| People | MMI Level | Shaking | Damage |
|---|---|---|---|
| 0 | I |
Not noticable | None |
| 7,860 | II |
Very weak | None |
| 206,000 | III |
Weak | Probably none |
| 11,480 | 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
Guam and Northern Mariana Islands are both located within 300km distance of the epicenter of the earthquake.
The closest significant population center near the earthquake is Dededo Village in Dededo, Guam. Dededo Village is located 34 kilometer (21 mi) north-northwest of the epicenter. Dededo Village experienced an earthquake intensity (MMI Scale) of roughly III. That level implies weak shaking and probably no damage.
An overview of nearby towns and cities is available in the overview below. If places don't have intensity data available, it likely means the experienced impact in those places was fairly small.
Overview of nearby places
| Distance | Place | Intensity (MMI) |
|---|---|---|
| 34 km (21 mi) SSE from epicenter |
Dededo Village Dededo, Guam. |
III
Weak |
| 35 km (22 mi) SSE from epicenter |
Tamuning-Tumon-Harmon Village Tamuning, Guam. |
III
Weak |
| 35 km (22 mi) SSE from epicenter |
Tamuning Tamuning, Guam. |
III
Weak |
| 36 km (22 mi) SE from epicenter |
Yigo Village Yigo, Guam. |
IV
Light |
| 36 km (22 mi) SSE from epicenter |
Hagåtña Hagatna, Guam. |
III
Weak |
| 36 km (22 mi) SSE from epicenter |
Guam Government House Hagatna, Guam. |
III
Weak |
| 40 km (25 mi) SSE from epicenter |
Mangilao Village Mangilao, Guam. |
III
Weak |
| 196 km (122 mi) NE from epicenter |
Saipan Saipan, Northern Mariana Islands. |
III
Weak |
Earthquake Intensity Map
The graph below overlays a map of the region around the epicenter with earthquake intensity data provided by the US Geographic Survey. The highest intensity level detected for this earthquake is IV.
Aftershocks detected
This main shock was prefaced by 1 smaller foreshock. Roughly 6 hrs before this earthquake, a foreshock measuring MAG-4 was detected nearby this earthquake.
Overview of foreshocks and aftershocks
| Classification | Magnitude | When | Where |
|---|---|---|---|
| Foreshock | M 4.0 |
6 hrs earlier Jun 23, 2025 23:27 (Guam Time) | 16 km (10 mi) NNW from Main Shock. |
| Main Shock This Earthquake |
M 5.4 |
Jun 24, 2025 05:14 (Guam Time) | - |
More earthquakes coming?
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 May 28th, 2025, when a 5.8 magnitude earthquake hit 121 km (75 mi) further south-southeast. An even stronger magnitude 6 earthquake struck on February 13th, 2022.
In total, 38 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 146 km (91 mi). Earthquakes this deep in the earth are unlikely to trigger a tsunami. |
Sources
Last updated 19/07/25 00:38 (). 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 us7000q89a
- European-Mediterranean Seismological Centre (EMSC): Earthquake 20250623_0000199
- Geonames.org: World Cities Database
- Google Maps: Static API
- Earthquakelist.org: Historic Earthquakes Database
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