4.9

M4.9 Earthquake north of Severnaya Zemlya — September 21, 2025

2025-09-21 15:19:12 UTC (2025-09-21) · approx. 11:19 PM UTC+8 local

MagnitudeM4.9(mb)
Time15:19 UTC≈ 11:19 PM UTC+8
Depth10.0 kmshallow crustal
Coordinates83.858°, 113.124°
Felt byNo felt reports
Status✓ Reviewed by USGS

On September 21, 2025 at 15:19 UTC, a magnitude 4.9 shallow crustal earthquake struck north of Severnaya Zemlya, at a depth of 10.0 km and coordinates 83.8577°, 113.1236°. This earthquake was detected by 84 seismic stations with excellent location accuracy and was assigned a USGS significance rating of 369, placing it among routine seismic activity.

Physical scale: An earthquake of magnitude 4.9 releases seismic energy equivalent to roughly 338 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 1.4 km — a useful intuition for the size of the slip patch on the fault.

Map showing earthquake epicenter at 83.86°, 113.12°

Earthquake Details

Magnitude
4.9 mb
Depth
10.0 km
shallow crustal
Location
83.8577°N
113.1236°E

Technical Information

Event ID
us7000qxpt
Event Type
earthquake
Status
✓ Reviewed
Significance
369
Stations Used
84
Azimuthal Gap
68.0°
Min Station Distance
12.637°
RMS Residual
0.92 sec
Last Updated
2025-12-06 16:00:26 UTC

Common Questions

How strong was the magnitude 4.9 earthquake north of Severnaya Zemlya?

The magnitude 4.9 earthquake that struck north of Severnaya Zemlya on September 21, 2025 at 15:19 UTC had a depth of 10.0 km. For context, this was a light earthquake commonly felt near the epicenter.

Where did the earthquake occur?

The earthquake epicenter was located at 83.8577°, 113.1236°, which is north of Severnaya Zemlya.

Were there aftershocks?

Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 4.9 earthquakes can continue for several days and gradually diminish over time.

What should I do after an earthquake?

If you were in the affected area: check yourself and others for injuries, inspect your home for damage, and be prepared for aftershocks. For detailed guidance, see our earthquake safety guide and emergency planning resources.

Actions

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Authoritative source: USGS event page (event ID: us7000qxpt). All scientific values on this page are sourced verbatim from the USGS feed.

Cite this page: EarthquakeTracker.org. (2025, September 21, 2025). M4.9 Earthquake north of Severnaya Zemlya — September 21, 2025. Retrieved May 28, 2026 from https://www.earthquaketracker.org/earthquakes/event/us7000qxpt/