The US Earthquake Record, Sealed Daily

Name: Sealed daily copies of the USGS all_day feed
Creator: US Tech Automations

10,736 distinct events in 10,902 sealed rows across 46 daily copies of the USGS all_day feed, 2026-06-23 to 2026-08-09 · USGS overwrites that feed every day and revises events in place, so this dated archive cannot be reconstructed from any public source, including USGS.

Of the 166 events we sealed more than once — the only events in which a revision is detectable at all — 12 came back with a published field changed, and 7 had the magnitude or the review status itself revised. 1 of those revisions moved a magnitude across M3.5. See what changed →

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 An event that appeared in the feed and was superseded between two of our seals is not in this archive at all.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

Days we did not seal. 46 seals span 48 calendar days, so these days inside the span have no sealed copy: 2026-07-04, 2026-07-15. 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). 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.

By magnitude

Magnitude	Events
Below M1.0	2,651
M1.0 – M1.9	4,945
M2.0 – M2.9	1,706
M3.0 – M3.9	373
M4.0 – M4.9	773
M5.0 and above	286
No magnitude published	2

1,176 of 10,736 events were sealed at or above M3.5.

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.

Email me revisions in my area →

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Prefer to just buy it? See the custom, source-cited close file, priced, with a sample deliverable.

By state, as USGS wrote the place

Also present in the archive, below our page threshold, so no page is minted for them: Tennessee (14), Arkansas (11), Missouri (10), Idaho (8), Colorado (5), the Northern Mariana Islands (4), North Carolina (3), South Carolina (3), Florida (2), Illinois (2), Ohio (2), Alabama (1), Arizona (1), Guam (1), Virginia (1).

How a state is assigned, and when it is not. USGS puts the region after the last comma of the place string. We map that tail from an explicit table only: 9,634 of 10,736 events resolve to one of 29 US state or territory codes. The rest are counted and left unassigned — 920 carry a tail outside the US (Mexico, Japan, Chile and so on), 180 carry a region descriptor with no comma at all ("off the coast of Oregon"), and 2 carry a tail that names both a US state and a country. We do not guess which.

By event type, as published

Type	Events
earthquake	10,581
quarry blast	91
explosion	57
experimental explosion	2
ice quake	2
landslide	2
mining explosion	1

Below our page threshold, so named here instead of given a page: experimental explosion (2), ice quake (2), landslide (2), mining explosion (1).

The most recent seals

Every sealed day is listed on the methodology page.

The last few fetches, in full

Seal	We read at	Source last modified	HTTP	Source
2026-08-09	2026-08-09T13:43:18+00:00	Sun, 09 Aug 2026 13:43:00 GMT	200	source file
2026-08-08	2026-08-08T22:49:15+00:00	Sat, 08 Aug 2026 22:48:22 GMT	200	source file
2026-08-07	2026-08-07T13:41:33+00:00	Fri, 07 Aug 2026 13:41:11 GMT	200	source file
2026-08-06	2026-08-06T13:43:04+00:00	Thu, 06 Aug 2026 13:42:15 GMT	200	source file
2026-08-05	2026-08-05T13:41:39+00:00	Wed, 05 Aug 2026 13:41:34 GMT	200	source file

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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