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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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5.4

193 km WSW of Merizo Village, Guam

28 October 2026, 02:14:17 (+03) 2026-10-27 23:14:17 UTC

3 sources: EMSC, USGS, GFZ mww
Did you feel this earthquake?
Magnitude
5.4 mww
Depth
101.0 km
Coordinates
12.6676, 142.9938
Data consistency
92/100

Regional activity (100 km)

Last 24 hours
1
Last 7 days
1
Last 30 days
2

Approximate energy released

≈ 1.9 kt TNT

7.94e+12 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 Maximum intensity (MMI): 0,0 PAGER: green 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

2 earthquakes

By magnitude

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

By depth

  • 0–10 km 0
  • 10–20 km 0
  • 20–40 km 0
  • 40–70 km 0
  • 70–150 km 2
  • 150+ km 0

Largest previous earthquakes within 100 km

Largest earthquakes in the platform catalogue and entries from historical catalogues (with citation).

No records.

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
GUAM REGION
 5.4 mw 90.8 km 23:14:16.650 Δt 0.77 sn · 9.84 km · ΔM 0 Original record
USGS Earthquake Hazards Program Displayed
193 km WSW of Merizo Village, Guam
 5.4 mww 101.0 km 23:14:17.420 Δt 0 sn · 0 km · ΔM 0 Original record
GFZ GEOFON
South of Mariana Islands
 5.6 mb 10.0 km 23:14:07.070 Δt 10.35 sn · 19.89 km · ΔM +0.2 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) GEOFON Program, GFZ Helmholtz Centre for Geosciences — CC BY 4.0

Revision history

  1. 28.10.2026 10:34:31 · EMSC · update

    depth: 101 → 90.8 latitude: 12.6676 → 12.7283 longitude: 142.9938 → 143.06 time: 2026-10-27T23:14:17.420+00:00 → 2026-10-27T23:14:16.650+00:00 location: MARIANA ISLANDS REGION → GUAM REGION

  2. 28.10.2026 03:21:10 · EMSC · update

    depth: 91.6 → 101 latitude: 12.6981 → 12.6676 longitude: 142.9431 → 142.9938 time: 2026-10-27T23:14:16.760+00:00 → 2026-10-27T23:14:17.420+00:00

  3. 28.10.2026 03:20:07 · USGS · update

    depth: 91.64 → 101 latitude: 12.6981 → 12.6676 longitude: 142.9431 → 142.9938 time: 2026-10-27T23:14:16.760+00:00 → 2026-10-27T23:14:17.420+00:00 location: 197 km WSW of Merizo Village, Guam → 193 km WSW of Merizo Village, Guam

  4. 28.10.2026 03:20:07 · SISTEM · recompute

    depth: 91.64 → 101 latitude: 12.6981 → 12.6676 longitude: 142.9431 → 142.9938 time: 2026-10-27T23:14:16.760Z → 2026-10-27 23:14:17.420+00:00

  5. 28.10.2026 02:31:39 · GFZ · update

    depth: 110.2 → 10 latitude: 12.718 → 12.82 longitude: 143.007 → 143.091 magnitude: 5.5 → 5.6 time: 2026-10-27T23:14:19.040+00:00 → 2026-10-27T23:14:07.070+00:00

  6. 28.10.2026 02:26:59 · SISTEM · recompute

    depth: 91.6 → 91.64 source count: 2 → 3 review status: automatic → reviewed magnitude type: mw → mww confirming sources: emsc,gfz → emsc,usgs,gfz preferred source: 3 → 4

  7. 28.10.2026 02:26:57 · EMSC · update

    depth: 110.2 → 91.6 latitude: 12.718 → 12.6981 longitude: 143.007 → 142.9431 time: 2026-10-27T23:14:19.040+00:00 → 2026-10-27T23:14:16.760+00:00 location: GUAM REGION → MARIANA ISLANDS REGION magnitude type: mb → mw

  8. 28.10.2026 02:26:57 · SISTEM · recompute

    depth: 110.2 → 91.6 latitude: 12.718 → 12.6981 longitude: 143.007 → 142.9431 time: 2026-10-27T23:14:19.040Z → 2026-10-27 23:14:16.760+00:00 magnitude type: mb → mw

  9. 28.10.2026 02:23:15 · SISTEM · recompute

    source count: 1 → 2 confirming sources: emsc → emsc,gfz

  10. 28.10.2026 02:22:50 · EMSC · update

    depth: 28 → 110.2 latitude: 12.6372 → 12.718 longitude: 142.6875 → 143.007 time: 2026-10-27T23:14:14.130+00:00 → 2026-10-27T23:14:19.040+00:00 location: MARIANA ISLANDS REGION → GUAM REGION

  11. 28.10.2026 02:22:50 · SISTEM · recompute

    depth: 28 → 110.2 latitude: 12.6372 → 12.718 longitude: 142.6875 → 143.007 time: 2026-10-27T23:14:14.130Z → 2026-10-27 23:14:19.040+00:00

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