Earthquake record › Alaska › M4.0 – M4.9

M4.0 – M4.9 Events in Alaska

83 events in the M4.0 – M4.9 range whose USGS place string ends in Alaska, across 41 of our daily seals.

What this archive is, exactly. The USGS all_day feed holds the last 24 hours and is overwritten in place. We seal one dated copy of it per day. An event that appeared in the feed and was superseded between two of our seals is not in this archive at all. These pages are a record of what USGS asserted at each seal — they are not a complete catalogue of earthquakes, and nothing here should be read as one.

Review status as sealed: reviewed 82, automatic 1. An automatic value is a machine solution USGS may still revise; a reviewed value has had a human look at it. Which one you are reading matters more than the magnitude itself.

83 of 83 events in Alaska in this range were sealed at or above M3.5 — the magnitude Texas Railroad Commission seismic-response conditions are written around. That is a count of what the feed said, not a determination about any permit, operator or well.

Get told when the record changes for Alaska

USGS publishes the last day and overwrites it, then revises events in place — automatic becomes reviewed, magnitudes move, and the old value stops existing everywhere. We seal a dated copy every day. Leave your email and we'll tell you when an event in Alaska is revised after the fact, with what it said before.

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Largest in this range

Magnitude	Place, as published	Review status	Seal
M4.90	13 km SSE of Clam Gulch, Alaska	reviewed	2026-06-27
M4.90	106 km NNW of Aleknagik, Alaska	reviewed	2026-07-16
M4.90	96 km SSE of Akhiok, Alaska	reviewed	2026-07-23
M4.90	85 km SSW of Nikolski, Alaska	reviewed	2026-09-03
M4.90	88 km SW of Nikolski, Alaska	reviewed	2026-06-26
M4.90	83 km SSE of Atka, Alaska	reviewed	2026-08-02
M4.90	68 km ESE of Atka, Alaska	reviewed	2026-08-09
M4.90	98 km SSW of Nikolski, Alaska	reviewed	2026-09-03
M4.90	81 km SW of Nikolski, Alaska	reviewed	2026-09-04
M4.90	90 km SSW of Nikolski, Alaska	reviewed	2026-09-04
M4.90	80 km SSW of Nikolski, Alaska	reviewed	2026-09-06
M4.80	184 km SE of Perryville, Alaska	reviewed	2026-08-30
M4.80	92 km SSW of Nikolski, Alaska	reviewed	2026-09-02
M4.80	152 km S of Hydaburg, Alaska	automatic	2026-08-03
M4.80	77 km SE of Atka, Alaska	reviewed	2026-08-02
M4.80	195 km SE of Akutan, Alaska	reviewed	2026-08-28
M4.80	81 km SSW of Nikolski, Alaska	reviewed	2026-09-04
M4.70	231 km ESE of Attu Station, Alaska	reviewed	2026-06-28
M4.60	99 km SSE of Sand Point, Alaska	reviewed	2026-08-11
M4.60	95 km SE of Atka, Alaska	reviewed	2026-07-23

All magnitudes in Alaska · M4.0 – M4.9 worldwide.

Days we did not seal. 69 seals span 77 calendar days, so these days inside the span have no sealed copy: 2026-07-04, 2026-07-15, 2026-08-14, 2026-08-15, 2026-08-16, 2026-08-17, 2026-08-22, 2026-08-23. A missing day means we did not read the feed. It does not mean nothing happened, and those dates return a 404 here rather than a page reading zero.

One seal is wider than the others. These dates were collected more than once: 2026-07-16 (2 runs, 00:48 and 13:42 UTC), 2026-08-18 (2 runs, 05:41 and 23:15 UTC), 2026-08-24 (12 runs, 00:43 and 11:00 UTC), 2026-08-25 (11 runs, 02:00 and 22:09 UTC), 2026-08-26 (4 runs, 00:05 and 22:05 UTC), 2026-08-27 (4 runs, 00:05 and 22:09 UTC), 2026-08-28 (4 runs, 00:05 and 22:08 UTC), 2026-08-29 (4 runs, 00:08 and 22:05 UTC), 2026-08-30 (4 runs, 00:07 and 22:05 UTC), 2026-08-31 (4 runs, 00:05 and 22:08 UTC), 2026-09-01 (4 runs, 00:06 and 22:10 UTC), 2026-09-02 (4 runs, 00:05 and 22:05 UTC), 2026-09-03 (4 runs, 00:09 and 22:09 UTC), 2026-09-04 (4 runs, 00:07 and 22:08 UTC), 2026-09-05 (4 runs, 00:08 and 22:06 UTC), 2026-09-06 (4 runs, 00:09 and 22:08 UTC), 2026-09-07 (4 runs, 00:09 and 22:05 UTC). A day with two runs covers more than 24 source-hours, so its event count is larger for a collection reason and not a seismic one. Do not read it as a busy day.

Compiled from dated copies of the U.S. Geological Survey's public all_day realtime feed (a work of the US government, in the public domain). Values are reproduced exactly as USGS published them on the date shown and may since have been revised; USGS is the authority on the current value of any event. These pages are provided for informational purposes only, carry no warranty of accuracy or completeness, and are not an earthquake warning, a safety notice, or engineering advice. Always verify against the USGS Earthquake Hazards Program before relying on any figure.

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