M4.9 Earthquake Strikes 90 km South-Southwest of Nikolski, Alaska

The U.S. Geological Survey reports that a magnitude 4.9 earthquake struck this afternoon roughly 90 kilometers (about 56 miles) south-southwest of Nikolski, Alaska, a small community on Umnak Island in the Aleutian chain. The quake occurred at a depth of approximately 44 kilometers (27 miles) beneath the surface.

A magnitude 4.9 quake is considered moderate. At this depth and distance offshore, shaking would likely have been felt as a brief rolling or rattling sensation in Nikolski and possibly in other parts of the central Aleutians, but significant structural damage is unlikely. There have been no immediate reports of injuries or damage, which is typical for an event of this size in this region. Because of the quake’s moderate magnitude and depth, a tsunami is not expected.

Residents in and around Nikolski are the most likely to have noticed this event. The Aleutian Islands sit along the seismically active boundary where the Pacific Plate slides beneath the North American Plate, so earthquakes of this size are relatively common in the area and are part of the region’s normal geological activity.

What to keep in mind

If you felt the shaking, a few sensible steps apply. First, check your home for anything that may have shifted, cracked, or fallen – especially items on high shelves or hanging fixtures. Second, be aware that light aftershocks are possible in the hours and days after a quake of this size; these are usually smaller than the main event. Third, this is a good reminder for anyone in coastal Alaska to know their local tsunami evacuation route – even though this quake poses no tsunami threat, larger offshore earthquakes in the Aleutians can, and official alerts are issued quickly when needed. Keep a basic emergency kit with water, food, medications, and a battery-powered or hand-crank radio on hand, as is standard practice in this seismically active region.

There is no cause for alarm from this particular event, but it is a useful prompt to review household preparedness, especially for families in remote island communities where outside help can take time to arrive.

Data for this alert comes from the U.S. Geological Survey (USGS) earthquake monitoring network.

Frequently Asked Questions

Was the earthquake felt in Nikolski or other communities?
Shaking was likely felt in Nikolski, about 90 km from the epicenter, as a brief rolling or rattling sensation. At magnitude 4.9 and 44 km deep, strong or damaging shaking is unlikely.

Is a tsunami possible from this earthquake?
No tsunami is expected. A magnitude 4.9 quake at this depth is too small to displace the seafloor significantly, and no tsunami warning has been issued.

Could there be aftershocks?
Yes, light aftershocks are common in the hours and days following a quake of this size, though they are typically smaller and not damaging.

Is this earthquake unusual for the Aleutian Islands?
No – the Aleutians sit on a major tectonic plate boundary, and moderate earthquakes like this occur there regularly as part of normal seismic activity.

Keep tracking this: the Space Weather Command Center shows live storm levels, aurora visibility and active alerts in plain English, and the Event Database is a searchable log of every earthquake, solar flare, CME and geomagnetic storm we’ve tracked, free to search or download.

Source: USGS

Related Reading

• Earthquake Survival: Precautions, Kit & Early Warning in 2026
• Analyzing Low-Radiation Nuclear Explosions: Tactical Assessments and Survival Strategies

Reported Impact

2 people have reported feeling this quake to USGS’s “Did You Feel It?” system so far; the maximum reported shaking intensity is 2.1 on the Community Decimal Intensity scale.

Impact figures are from USGS as of when this alert was generated and can rise as more reports come in – this is not a final damage assessment.

Map centered on the epicenter (52.25, -169.58). Map data © OpenStreetMap contributors.

Sky & Solar Conditions at the Time

Moon: Last Quarter (59% illuminated), in Gemini.

Notable planetary angles: Jupiter trine Saturn (121°), Mars square Saturn (91°), Mercury sextile Mars (62°), Sun sextile Mars (56°).

Concurrent space weather: planetary Kp index 1.3; strongest recent solar flare: nothing notable.

This is a factual snapshot, not a claim of cause and effect – researchers are divided on whether lunar, planetary or solar factors influence seismic or weather activity. It’s included so readers can track the pattern for themselves over time.

Earthquakes Within ~400 km, Past 30 Days

For context, here is other recent seismic activity in the surrounding region (M2.5+, via USGS):

Emergency number for Alaska: 911 (General guidance – always verify locally, as this can vary by region.)