M5.6 Earthquake near Susitna, Alaska — 27 November 2025
A moderate earthquake of magnitude 5.6 was recorded near Susitna, Alaska on , with an epicentre 14 km west-northwest of Susitna, at a focal depth of 70.4 km.
Time (UTC): 2025-11-27 17:11:28
Time (your timezone): —
Magnitude: 5.6 (moderate)
Focal depth: 70.4 km (intermediate)
Epicentre: 61.6103, -150.7360
Location: 14 km WNW of Susitna, Alaska
USGS link to NOAA tsunami information: Not linked
Review status: Reviewed
Source: USGS event page
How strong was this earthquake?
Moderate earthquakes can damage poorly built or unreinforced structures near the epicentre, while well-engineered buildings typically escape serious harm. Shaking is often strong enough to wake sleeping residents over a wide area.
A magnitude 5.6 earthquake radiates roughly 3,211 tons of TNT equivalent in seismic energy.
The USGS assigns this earthquake a significance score of 483, which is below 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 61.6103, -150.7360 — 14 km west-northwest of Susitna. The closest other recorded event was a magnitude 1.5 earthquake 11 km south of here on 29 July 2026.
Why the 70 km depth matters
At 70 km this was an intermediate-depth earthquake. Energy from events at this depth spreads out before it reaches the surface, which usually means weaker shaking near the epicentre than a shallow quake of the same magnitude, but shaking felt across a wider area.
This catalogue does not ingest eyewitness responses, so it cannot confirm where this earthquake was felt. Based on magnitude alone, an event this size can be felt widely and may cause minor local damage. Its intermediate depth normally reduces peak shaking near the epicentre compared with a shallow event of the same magnitude.
What does the tsunami information flag mean?
The USGS record does not carry a link to NOAA tsunami information. That field is not an all-clear and does not state whether a tsunami occurred. In this case, a damaging tsunami would be less likely because at M5.6 it falls below the magnitude 6.5 threshold that generally applies before a submarine earthquake displaces enough water to generate a damaging tsunami; it occurred inland rather than beneath the sea floor. For an active coastal alert, use tsunami.gov or your local warning authority.
How earthquakes generate tsunamis, and what the alert levels mean →
Aftershocks and local seismic history
120 further earthquakes have been recorded within about 150 km of the epicentre in the seven days after this event, the largest of them magnitude 6.0.
38 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 M5.6 event released about 4.7 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 November 2025 worldwide record. Browse the full monthly archive to compare periods.
Nearest recorded earthquakes to this epicentre
- M1.5 earthquake near Susitna, Alaska — (11 km S)
- M1.8 earthquake near Susitna, Alaska — (20 km WNW)
- M1.5 earthquake near Susitna, Alaska — (24 km ESE)
- M1.5 earthquake near Susitna, Alaska — (26 km SSW)
- M2.1 earthquake near Beluga, Alaska — (29 km SSW)
- M1.7 earthquake near Willow, Alaska — (34 km NE)
- M1.4 earthquake near Beluga, Alaska — (36 km SW)
- M1.1 earthquake near Big Lake, Alaska — (45 km ESE)
- M2.1 earthquake near Willow, Alaska — (45 km NE)
- M1.9 earthquake near Houston, Alaska — (48 km E)
Other magnitude 5 earthquakes worldwide
- M5.6 earthquake near Port McNeill, Canada —
- M5.5 earthquake near Mutsu, Japan —
- M5.6 earthquake near San Fernando, Peru —
- M5.8 earthquake near Kermadec Islands region —
- M5.4 earthquake near Abepura, Indonesia —
- M5.3 earthquake near Kokopo, Papua New Guinea —
- M5.6 earthquake near Pacific-Antarctic Ridge —
- M5.4 earthquake near Rapu-Rapu, Philippines —
Questions about this earthquake
How strong is a magnitude 5.6 earthquake?
Moderate earthquakes can damage poorly built or unreinforced structures near the epicentre, while well-engineered buildings typically escape serious harm. Shaking is often strong enough to wake sleeping residents over a wide area. A magnitude 5.6 earthquake radiates roughly 3,211 tons of TNT equivalent in seismic energy.
How deep was the earthquake near Susitna?
At 70 km this was an intermediate-depth earthquake. Energy from events at this depth spreads out before it reaches the surface, which usually means weaker shaking near the epicentre than a shallow quake of the same magnitude, but shaking felt across a wider area.
Was the M5.6 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 can be felt widely and may cause minor local damage. Its intermediate depth normally reduces peak shaking near the epicentre compared with a shallow event of the same magnitude.
What does the USGS tsunami field mean for this event?
The USGS record does not carry a link to NOAA tsunami information. That field is not an all-clear and does not state whether a tsunami occurred. In this case, a damaging tsunami would be less likely because at M5.6 it falls below the magnitude 6.5 threshold that generally applies before a submarine earthquake displaces enough water to generate a damaging tsunami; it occurred inland rather than beneath the sea floor. For an active coastal alert, use tsunami.gov or your local warning authority.
Have there been aftershocks?
120 further earthquakes have been recorded within about 150 km of the epicentre in the seven days after this event, the largest of them magnitude 6.0.
How often do earthquakes happen near Susitna?
38 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 M5.6 event released about 4.7 times less energy than that event.