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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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2.7

61 km SW of Adak, Alaska

18 October 2026, 17:55:45 (+03) 2026-10-18 14:55:45 UTC

2 sources: EMSC, USGS ml
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Magnitude
2.7 ml
Depth
10.0 km
Coordinates
51.4342, -177.1744
Data consistency
84/100

Regional activity (100 km)

Last 24 hours
0
Last 7 days
7
Last 30 days
44

Approximate energy released

≈ 0.2 t TNT

7.08e+8 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

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

49 earthquakes

By magnitude

  • M0 0
  • M1 0
  • M2 34
  • M3 12
  • M4 3
  • M5 0
  • M6 0
  • M7 0
  • M8+ 0

By depth

  • 0–10 km 6
  • 10–20 km 16
  • 20–40 km 25
  • 40–70 km 1
  • 70–150 km 1
  • 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

Sources report different values.
Agency Magnitude Depth Time (UTC) Difference from master Original record
EMSC-CSEM
ANDREANOF ISLANDS, ALEUTIAN IS.
 2.4 ml 18.2 km 14:55:47.380 Δt 2.21 sn · 13.31 km · ΔM -0.3 Original record
USGS Earthquake Hazards Program Displayed
61 km SW of Adak, Alaska
 2.7 ml 10.0 km 14:55:45.168 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. 24.10.2026 19:19:58 · USGS · update

    depth: 17.3 → 10 latitude: 51.483 → 51.4342 longitude: -177.18 → -177.1744 time: 2026-10-18T14:55:45.932+00:00 → 2026-10-18T14:55:45.168+00:00 location: 57 km SW of Adak, Alaska → 61 km SW of Adak, Alaska

  2. 24.10.2026 19:19:58 · SISTEM · recompute

    depth: 17.3 → 10 latitude: 51.483 → 51.4342 longitude: -177.18 → -177.1744 time: 2026-10-18T14:55:45.932Z → 2026-10-18 14:55:45.168+00:00

  3. 22.10.2026 09:20:35 · SISTEM · recompute

    depth: 18.2 → 17.3 latitude: 51.55 → 51.483 longitude: -177.2225 → -177.18 magnitude: 2.4 → 2.7 time: 2026-10-18T14:55:47.380Z → 2026-10-18 14:55:45.932+00:00 source count: 1 → 2 review status: automatic → reviewed confirming sources: emsc → emsc,usgs preferred source: 3 → 4

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