Earthquake record attestation
Counted from the archive on 2026-09-08: 69 daily seals held, 2026-06-23 to 2026-09-07, covering 16995 events. 411 of the 3311 events we read on more than one day were changed by USGS after publication, and 364 of those changes moved a magnitude or a review status.
The USGS all-day feed holds 24 hours and is overwritten in place, so the question "what did the public record say about this event on that date?" has no answer once the feed rolls. We have sealed one dated copy a day since 2026-06-23 and never rewritten one. Name an event or a date window and we hand you what USGS asserted at each seal we hold, and what changed between them.
Not on sale
Withdrawn 2026-08-25. We charged for dated copies of earthquake records that USGS serves free. Its own feed returns superseded versions on request, so the thing this service sold -- what the public record said on an earlier date -- was already available from the source at no cost. The sealed copies we made stay readable; we should not have been charging for them.
We are not taking new orders for this service, so there is no price and no way to order it here. The evidence we already hold stays readable and is still described on this page.
What you get
- One attestation file for the event or window you name, as a hosted page you can link or print, plus the CSV behind it
- Every value USGS asserted at each seal we hold, with the seal date
- What changed between seals, field by field — magnitude, status, depth, place, review state
- The source URL, our fetch timestamp, and the content hash of the sealed copy each row came from
- An event or date we hold no seal for is reported as unheld, never as an absence of revision
What an attestation is for
USGS revises earthquakes after it publishes them. Magnitudes move, epicentres move, and an automatic solution becomes a reviewed one. When that happens the earlier figure is not marked superseded anywhere public — it is simply gone, because the feed is a rolling window and the catalogue behind it serves the current value of an earthquake, never the value it carried on a past date.
If you priced a contract, filed a claim, or triggered a payout on what the record said that morning, you now have no way to show what it said. We have been sealing the feed daily since June, so we can hand you a dated file of what the authoritative source asserted on the day you acted, with the fetch time and the response hash behind each row.
An attestation is a read of what we sealed. It is not an earthquake report, not a seismological opinion, and not affiliated with USGS.
Free sample — the record, and one event it caught
The archive holds 69 daily seals covering 2026-06-23 to 2026-09-07 and 16995 events. Of those, 3311 were read on more than one day, which is the only population in which a revision can be seen at all: 411 of them changed after publication and 364 changed magnitude or review status.
411 revised out of 3311 comparable, not out of 16995. An event we sealed once cannot be shown to have changed, and the feed window is 24 hours against a daily seal, so only events near the boundary are ever read twice. Dividing by the total would be a fabricated rate.
One of them: ci41537048, 45 km NE of Holtville, CA — sealed 2026-08-26, resealed 2026-08-27.
| Field | As asserted first | As asserted after |
|---|---|---|
| magnitude | 1.18 | 1.31 |
| place | 45 km NNW of Los Algodones, B.C., MX | 45 km NE of Holtville, CA |
| origin time | 2026-08-26T19:43:01+00:00 | 2026-08-26T19:43:00+00:00 |
| review status | automatic | reviewed |
| significance | 21 | 26 |
| event type | earthquake | quarry blast |
| longitude | -114.982666666667 | -114.992166666667 |
| latitude | 33.0435 | 33.057 |
| depth (km) | 3.62 | -0.2 |
| title | M 1.2 - 45 km NNW of Los Algodones, B.C., MX | M 1.3 Quarry Blast - 45 km NE of Holtville, CA |
You send:
- The event you need attested — a USGS event id, or a date and a place
- The date, or dates, you need the assertion as of
You get back:
- One row per sealed date we hold the event on: magnitude, review status, origin time, epicentre, depth, significance, and USGS's own updated marker, as asserted that day
- The fields that moved between two dates, printed before and after
- The fetch timestamp and the response hash behind every row
- A named list of any date in the range we did not seal
- A manifest hashing every file in the delivery
Days inside the span we did not seal, named rather than spanned: 2026-07-04, 2026-07-15, 2026-08-14, 2026-08-15, 2026-08-16, 2026-08-17, 2026-08-22, 2026-08-23.
There is no filled-in attestation here because the event is yours. The specimen above is a real event this archive caught being revised, so what the file cannot show you is only which event it will be about.
The USGS realtime summary feed is a rolling 24-hour window that is overwritten in place, and the catalogue behind it serves the current value of an event, not the value it carried last Tuesday. We seal one immutable row per event per day, so the archive holds what the authoritative source asserted on the day it asserted it. An attestation is a read of those rows. A date we did not seal is named as a gap and never spanned, because a day we did not read is not a day nothing happened.
View the full machine-readable specimen and evidence rows
US Tech Automations is a data and automation company. These are our own service terms, not a government fee, filing cost, or permit charge. Nothing on this page is legal, engineering, or financial advice.