Earthquake record › seal of 2026-09-04

The USGS Feed as Sealed on 2026-09-04

617 events, exactly as the feed presented them at the moment we read it. Values on this page are what USGS asserted on this date — some of them have since been revised, and this page deliberately does not follow those revisions.

← 2026-09-03 · 2026-09-05 →

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 An event that appeared in the feed and was superseded between two of our seals is not in this archive at all.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.

This seal is wider than a day. The feed was collected 4 times on this date (00:07 and 22:08 UTC), so it covers more than 24 source-hours and holds more events than a single-run seal for a collection reason, not a seismic one.

308 of these events were already present in an earlier seal — the feed window overlaps our seal interval, so an event near the boundary is read twice. They are the only events in which a revision is detectable, and they are counted, not deduplicated away.

Review status as sealed: reviewed 415, automatic 202. 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.

By magnitude

Magnitude	Events
Below M1.0	121
M1.0 – M1.9	245
M2.0 – M2.9	131
M3.0 – M3.9	71
M4.0 – M4.9	32
M5.0 and above	16
No magnitude published	1

67 of 617 events in this seal 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 your area

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 your area is revised after the fact, with what it said before.

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Largest events in this seal

Magnitude	Place, as published	Review status	Seal
M6.30	84 km SSW of Nikolski, Alaska	reviewed	2026-09-04
M5.50	100 km S of Nikolski, Alaska	reviewed	2026-09-04
M5.40	21 km WNW of Jiangyou, China	reviewed	2026-09-04
M5.40	Kermadec Islands region	reviewed	2026-09-04
M5.30	104 km SSW of Nikolski, Alaska	reviewed	2026-09-04
M5.20	97 km SSW of Nikolski, Alaska	reviewed	2026-09-04
M5.20	100 km SSW of Nikolski, Alaska	reviewed	2026-09-04
M5.20	271 km SSE of Dunhuang, China	reviewed	2026-09-04
M5.20	28 km S of Cilacap, Indonesia	reviewed	2026-09-04
M5.10	42 km NW of Coquimbo, Chile	reviewed	2026-09-04
M5.10	115 km NE of Joshīmath, India	reviewed	2026-09-04
M5.10	Owen Fracture Zone region	reviewed	2026-09-04
M5.10	25 km W of Padangsidempuan, Indonesia	reviewed	2026-09-04
M5.00	Fiji region	reviewed	2026-09-04
M5.00	236 km ESE of Attu Station, Alaska	reviewed	2026-09-04
M5.00	South Sandwich Islands region	reviewed	2026-09-04
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	98 km W of Gorontalo, Indonesia	reviewed	2026-09-04
M4.90	south of the Fiji Islands	reviewed	2026-09-04

Where they were, as USGS wrote it

State or territory	Events
Alaska	250
California	132
Texas	52
Hawaii	46
Utah	46
New Mexico	18
Washington	12
Nevada	8
Puerto Rico	7
Oklahoma	4
Oregon	4
Montana	3
Wyoming	2
Idaho	1
the U.S. Virgin Islands	1

31 of 617 events in this seal carry a place tail we do not map to a US state — most of them are outside the US. They are counted here and left unassigned rather than guessed at.

How this seal was collected

Seal	We read at	Source last modified	HTTP	Source
2026-09-04	2026-09-04T00:07:53+00:00	Fri, 04 Sep 2026 00:07:00 GMT	200	source file

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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