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Significant earthquake

This summarises a recorded earthquake only; it is not a warning or a prediction. Follow AFAD and the competent authorities for official statements and guidance.

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2.8

39 km S of Tolsona, Alaska

20 October 2026, 00:11:38 (+03) 2026-10-19 21:11:38 UTC

2 sources: EMSC, USGS ml
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Magnitude
2.8 ml
Depth
13.9 km
Coordinates
61.7300, -146.1770
Data consistency
90/100

Regional activity (100 km)

Last 24 hours
0
Last 7 days
1
Last 30 days
7

Approximate energy released

≈ 0.2 t TNT

1.00e+9 J

Approximated with the Gutenberg–Richter relation (log E = 1.5 M + 4.8); depends on magnitude type. Gutenberg & Richter (1956).

Did you feel this earthquake?

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Community reports

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

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

8 earthquakes

By magnitude

  • M0 0
  • M1 0
  • M2 7
  • M3 0
  • M4 1
  • M5 0
  • M6 0
  • M7 0
  • M8+ 0

By depth

  • 0–10 km 1
  • 10–20 km 4
  • 20–40 km 3
  • 40–70 km 0
  • 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).

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
SOUTHERN ALASKA
 2.8 ml 10.0 km 21:11:37.662 Δt 0.98 sn · 3.82 km · ΔM 0 Original record
USGS Earthquake Hazards Program Displayed
39 km S of Tolsona, Alaska
 2.8 ml 13.9 km 21:11:38.638 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

  1. 23.10.2026 03:35:49 · USGS · update

    depth: 12.6 → 13.9 latitude: 61.732 → 61.73 longitude: -146.171 → -146.177 time: 2026-10-19T21:11:38.453+00:00 → 2026-10-19T21:11:38.638+00:00 review status: automatic → reviewed

  2. 23.10.2026 03:35:49 · SISTEM · recompute

    depth: 10 → 13.9 latitude: 61.7578 → 61.73 longitude: -146.2193 → -146.177 time: 2026-10-19T21:11:37.662Z → 2026-10-19 21:11:38.638+00:00 review status: automatic → reviewed preferred source: 3 → 4

  3. 20.10.2026 01:04:28 · SISTEM · recompute

    depth: 12.6 → 10 latitude: 61.732 → 61.7578 longitude: -146.171 → -146.2193 time: 2026-10-19T21:11:38.453Z → 2026-10-19 21:11:37.662+00:00 source count: 1 → 2 confirming sources: usgs → emsc,usgs preferred source: 4 → 3

  4. 20.10.2026 00:23:07 · USGS · update

    depth: 12.3 → 12.6 latitude: 61.738 → 61.732 longitude: -146.178 → -146.171 time: 2026-10-19T21:11:38.406+00:00 → 2026-10-19T21:11:38.453+00:00 location: 38 km S of Tolsona, Alaska → 39 km S of Tolsona, Alaska

  5. 20.10.2026 00:23:07 · SISTEM · recompute

    depth: 12.3 → 12.6 latitude: 61.738 → 61.732 longitude: -146.178 → -146.171 time: 2026-10-19T21:11:38.406Z → 2026-10-19 21:11:38.453+00:00

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