M 4.5 - 20 km WNW of Tyonek, Alaska
April 19, 2025 at 07:18:55 UTC
Depth: 90.50 km (Intermediate)
Key Takeaway
This light earthquake (M4.5) occurred 10 months ago near 20 km WNW of Tyonek, Alaska, at a depth of 90.50 km (intermediate). It was felt by 1,444 people. A tsunami warning was issued for this event.
Light
PAGER Alert
Tsunami
Felt Reports
Event Details
| Magnitude | 4.5 mwr |
| Depth | 90.50 km (Intermediate) |
| Location | 61.1590N, 151.4744W |
| Community Intensity | III (Weak) |
| Mercalli Intensity | III (Weak) |
| Felt Reports (DYFI) | 1,444 people |
| Alert Level (PAGER) | Green — No fatalities or damage expected |
| Tsunami Warning | Yes |
| Significance | 692 / 3000 |
| Status | Reviewed |
| Network | ak |
| USGS Event Page | View on USGS → |
Frequently Asked Questions
What was the magnitude of this earthquake?
This earthquake had a magnitude of 4.5, classified as "Light". Light earthquakes produce noticeable shaking but rarely cause damage.
How deep was this earthquake?
This earthquake occurred at a depth of 90.50 km, classified as "Intermediate". Intermediate-depth earthquakes are felt over a wider area but typically cause less surface damage than shallow events of the same magnitude.
Where exactly did this earthquake occur?
This earthquake occurred near 20 km WNW of Tyonek, Alaska, at coordinates 61.1590N, 151.4744W. The location is determined by analyzing seismic wave arrival times at multiple monitoring stations.
Were there aftershocks associated with this event?
Aftershock data for this specific event can be explored by viewing nearby recent earthquakes listed below on this page. Aftershocks are smaller earthquakes that occur in the same area following a larger event, and they can continue for days, weeks, or even months depending on the original earthquake's magnitude.
What does the magnitude of this earthquake mean in practical terms?
A magnitude 4.5 earthquake is classified as "Light" — these are commonly felt by people indoors but rarely cause any significant damage.
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Data from the USGS Earthquake Hazards Program (ComCat). QuakeScan is not affiliated with the USGS. Event details may be updated as new data becomes available.