169 km S of False Pass, Alaska
23 October 2026, 00:42:21 (+03) 2026-10-22 21:42:21 UTC
- Magnitude
- 4.0 mb
- Depth
- 10.0 km
- Coordinates
- 53.3354, -163.5539
- Data consistency
- 87/100
Regional activity (100 km)
- Last 24 hours
- 0
- Last 7 days
- 28
- Last 30 days
- 64
Approximate energy released
≈ 15 t TNT
6.31e+10 J
Approximated with the Gutenberg–Richter relation (log E = 1.5 M + 4.8); depends on magnitude type. Gutenberg & Richter (1956).
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Community reports
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- Community intensity
- Typical duration
- Farthest report
- felt it
Estimated, close to the MMI scale
Intensity distribution
Provinces with reports
Reported effects
Squares on the map show community reports (~11 km grid; colour = estimated intensity).
Based on voluntary reports from users; not an instrumental measurement or official intensity. For official information follow AFAD and Kandilli Observatory announcements.
Impact information reported by sources
- USGS Earthquake Hazards Program Tsunami flag: No Maximum intensity (MMI): 1,9 ShakeMap
These values are automatic products of the respective agency, not an assessment by this platform. For tsunami warnings follow the Kandilli Observatory Regional Earthquake-Tsunami Monitoring Center and AFAD.
Nearby places
No records.
Nearby faults (50 km)
No mapped fault within 50 km.
Last year, within 100 km
66 earthquakes
By magnitude
- M0 0
- M1 0
- M2 36
- M3 21
- M4 5
- M5 4
- M6 0
- M7 0
- M8+ 0
By depth
- 0–10 km 16
- 10–20 km 30
- 20–40 km 18
- 40–70 km 2
- 70–150 km 0
- 150+ km 0
Largest previous earthquakes within 100 km
Largest earthquakes in the platform catalogue and entries from historical catalogues (with citation).
- M5,0 244 km SSE of False Pass, Alaska 21.09.2026 · 98 km
- M4,5 158 km S of False Pass, Alaska 21.10.2026 · 12 km
- M4,0 195 km SE of Akutan, Alaska 21.10.2026 · 33 km
- M3,8 150 km S of False Pass, Alaska 21.10.2026 · 20 km
- M3,5 123 km S of False Pass, Alaska 26.09.2026 · 55 km
- M3,3 151 km S of False Pass, Alaska 21.10.2026 · 18 km
- M3,2 159 km S of False Pass, Alaska 21.10.2026 · 11 km
- M2,8 151 km S of False Pass, Alaska 22.10.2026 · 19 km
Comparison with past records
…
No earlier earthquakes are recorded in this area.
- Source:
Where does this earthquake come from?
Source comparison
| Agency | Magnitude | Depth | Time (UTC) | Difference from master | Original record |
|---|---|---|---|---|---|
|
EMSC-CSEM
UNIMAK ISLAND REGION, ALASKA
|
4.0 mb | 10.0 km | 21:42:22.730 | Δt 1.58 sn · 11.46 km · ΔM 0 | Original record |
|
USGS Earthquake Hazards Program
Displayed
169 km S of False Pass, Alaska
|
4.0 mb | 10.0 km | 21:42:21.148 | Δt 0 sn · 0 km · ΔM 0 | Original record |
This value summarises agreement between sources; it is not a measure of scientific accuracy. Euro-Mediterranean Seismological Centre (EMSC-CSEM) — CC BY 4.0 U.S. Geological Survey (USGS) Earthquake Hazards Program — Public domain (U.S. Government)
Revision history
-
23.10.2026 09:44:35 · EMSC · update
latitude: 53.3354 → 53.4318 longitude: -163.5539 → -163.6146 time: 2026-10-22T21:42:21.148+00:00 → 2026-10-22T21:42:22.730+00:00
-
23.10.2026 03:30:41 · SISTEM · recompute
source count: 1 → 2 review status: automatic → reviewed confirming sources: emsc → emsc,usgs preferred source: 3 → 4
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