M4.3 Earthquake near Susitna, Alaska — 05 February 2025
A light earthquake of magnitude 4.3 was recorded near Susitna, Alaska on , with an epicentre 22 km south-southwest of Susitna, at a focal depth of 5.4 km.
Time (UTC): 2025-02-05 08:07:09
Time (your timezone): —
Magnitude: 4.3 (light)
Focal depth: 5.4 km (shallow)
Epicentre: 61.3605, -150.7110
Location: 22 km SSW of Susitna, Alaska
USGS link to NOAA tsunami information: Available
Review status: Reviewed
Source: USGS event page
How strong was this earthquake?
Light earthquakes are widely felt near the epicentre and can rattle windows, dishes and hanging objects. Damage is uncommon and usually limited to cracked plaster or fallen loose items.
A magnitude 4.3 earthquake radiates roughly 43 tons of TNT equivalent in seismic energy.
The USGS assigns this earthquake a significance score of 664, which meets the USGS threshold of more than 600 for its significant-earthquake list. The ranking combines magnitude with available Did You Feel It responses and PAGER alert level; it is not a direct measurement of damage.
Where was the epicentre?
The epicentre was located at 61.3605, -150.7110 — 22 km south-southwest of Susitna. The closest other recorded event was a magnitude 1.5 earthquake 7 km west-northwest of here on 31 July 2026.
Why the 5 km depth matters
At 5 km this was a shallow earthquake. Shallow events release their energy close to the surface, so for a given magnitude they produce noticeably stronger shaking — and more damage — than deeper ones. Roughly three quarters of all earthquakes worldwide occur at shallow depths.
This catalogue does not ingest eyewitness responses, so it cannot confirm where this earthquake was felt. Based on magnitude alone, an event this size is often felt across the surrounding area. Its shallow focus makes stronger surface shaking more likely than for a deeper event of the same magnitude.
What does the tsunami information flag mean?
The USGS event record links to NOAA tsunami information because this was a large event in an oceanic region. That link flag does not mean a tsunami occurred or that a warning is active. Check tsunami.gov and instructions from your local authority for the current status of your coastline.
How earthquakes generate tsunamis, and what the alert levels mean →
Aftershocks and local seismic history
105 further earthquakes have been recorded within about 150 km of the epicentre in the seven days after this event, the largest of them magnitude 3.4.
37 earthquakes of magnitude 4 or above have been logged within roughly 200 km of this epicentre in our catalogue. The strongest was a magnitude 6.0 event near Susitna on 27 November 2025. This M4.3 event released about 355 times less energy than that event.
How long aftershock sequences last, and how large they get →
Where this event sits in the record
This earthquake is part of the February 2025 worldwide record. Browse the full monthly archive to compare periods.
Nearest recorded earthquakes to this epicentre
- M1.5 earthquake near Susitna, Alaska — (7 km WNW)
- M2.1 earthquake near Beluga, Alaska — (10 km W)
- M1.5 earthquake near Susitna, Alaska — (17 km N)
- M1.5 earthquake near Susitna, Alaska — (32 km NE)
- M1.4 earthquake near Beluga, Alaska — (32 km WNW)
- M1.6 earthquake near Beluga, Alaska — (39 km WSW)
- M1.8 earthquake near Susitna, Alaska — (41 km NNW)
- M1.7 earthquake near Tyonek, Alaska — (42 km SSW)
- M1.1 earthquake near Big Lake, Alaska — (43 km ENE)
- M0.2 earthquake near Beluga, Alaska — (47 km W)
Other magnitude 4 earthquakes worldwide
- M4.4 earthquake near El Arenal, Mexico —
- M4.3 earthquake near Puerto Madero, Mexico —
- M4.4 earthquake near Fiji region —
- M4.5 earthquake near Abepura, Indonesia —
- M4.1 earthquake near Charlotte Amalie, U.S. Virgin Islands —
- M4.0 earthquake near Charlotte Amalie, U.S. Virgin Islands —
- M4.6 earthquake near Honmachi, Japan —
- M4.2 earthquake near Banda Sea —
Questions about this earthquake
How strong is a magnitude 4.3 earthquake?
Light earthquakes are widely felt near the epicentre and can rattle windows, dishes and hanging objects. Damage is uncommon and usually limited to cracked plaster or fallen loose items. A magnitude 4.3 earthquake radiates roughly 43 tons of TNT equivalent in seismic energy.
How deep was the earthquake near Susitna?
At 5 km this was a shallow earthquake. Shallow events release their energy close to the surface, so for a given magnitude they produce noticeably stronger shaking — and more damage — than deeper ones. Roughly three quarters of all earthquakes worldwide occur at shallow depths.
Was the M4.3 earthquake near Susitna felt?
This catalogue does not ingest eyewitness responses, so it cannot confirm where this earthquake was felt. Based on magnitude alone, an event this size is often felt across the surrounding area. Its shallow focus makes stronger surface shaking more likely than for a deeper event of the same magnitude.
What does the USGS tsunami field mean for this event?
The USGS event record links to NOAA tsunami information because this was a large event in an oceanic region. That link flag does not mean a tsunami occurred or that a warning is active. Check tsunami.gov and instructions from your local authority for the current status of your coastline.
Have there been aftershocks?
105 further earthquakes have been recorded within about 150 km of the epicentre in the seven days after this event, the largest of them magnitude 3.4.
How often do earthquakes happen near Susitna?
37 earthquakes of magnitude 4 or above have been logged within roughly 200 km of this epicentre in our catalogue. The strongest was a magnitude 6.0 event near Susitna on 27 November 2025. This M4.3 event released about 355 times less energy than that event.