Public sample18 Aug 2026 vs 19 Aug 2026 · USGS event hv75020387
One product page. Many events. You name an event, and we hand you what USGS asserted at each seal we hold for it, and what changed between them. A date window rather than a single event is quoted by email.
USGS event hv75020387: magnitude 2.33 → 1.75 between 18 Aug 2026 and 19 Aug 2026.
The current USGS catalog keeps only 1.75. That overnight move is the product.
Doing this yourself
USGS revises an event in place. The magnitude, depth and location you see today quietly replace what the page said on the day, and the earlier reading is not kept anywhere you can reach.
To have it you had to save the page on the day, before the revision. After the fact there is nothing to download. We saved it.
What you get
- Dated copies we sealedNot a live scrape of today’s feed.
- What changed between those copiesWhat USGS asserted at each seal we hold.
- Whatever we hold for the event you nameYou name the event id. We reply with the seals we have for it.
This is not for sale, and it was. Until 25 Aug 2026 this page charged $249 for one named event. It should not have: USGS publishes this history itself, superseded versions included, so we were charging for something anyone can get free from the source. The page is kept up because what we sealed and when is still worth reading, and because we would rather show the record than delete it.
What this page cannot tell you
We hold what we sealed, and nothing else. There are days inside our range with no copy at all, and there is nothing at all before our first copy or after our last one. If your event happened outside that window, or was revised outside it, we cannot help and we will say so in the first reply.
We do not know why a number changed. We can show you that USGS said one thing on one day and something else on another, both read out of copies we dated ourselves. We do not know what the analyst did in between, we never ring anybody up to ask, and we do not say which reading is the right one.
This is not a seismology service and it is not a warning system. It is a record of what one public catalog said on the days we copied it. Nothing on this page is a judgement about USGS, about any event, or about anybody’s building.
How it works
- You email us. There is nothing to buy on this page.
- You reply with the event id you need, and we say which seals we hold for it. If what you need is a date window rather than one event, say so and we tell you what we hold across it.
- A person emails you what USGS asserted at each seal we hold, and what changed between them.
See the file
You do not have to take our word for what is in the file. Here are 25 rows of the real thing, carrying all 7 of its columns, cut out of the dated copies we sealed ourselves. Nothing in it is made up and nothing in it is tidied up.
- Open the 25 rows as a CSVA plain spreadsheet file. It saves to your machine rather than painting itself into a browser tab, and it opens in Excel, Numbers or Google Sheets.
- The same 25 rows as JSONThe same rows again, laid out for reading with code.
What arrives if you ask: a person emails you what you asked for as a CSV — the same plain spreadsheet as the sample above, not a login and not a web page — within one working day. There is no charge.
These 25 rows are a slice of the file, not the whole of it. Ask and we will tell you how far back our seals go.
Ask what we hold for a named event
Not for sale. USGS serves this history free, including superseded versions, so there is nothing here you should be paying us for. There is no button on this page and no charge behind it.
If it is still useful to know what we sealed and when, email operations@ustechautomations.com with the event id. A person replies with which seals exist for it, and names any day in that event’s range we did not seal. No card, no charge.
Questions people ask before they pay
USGS is free. So why did you charge for this?
We should not have. The argument was that USGS revises an event in place, so only today’s version is fetchable and our dated copies show what it said before. That is true as far as it goes, but USGS also serves superseded versions itself, so the gap we were charging to fill was mostly not a gap. We took it off sale on 25 Aug 2026.
The example still stands as a thing worth seeing: event hv75020387 read 2.33 on 18 Aug 2026 and 1.75 the next morning. That is what our seals record. Go to USGS first — it is their data and they publish the history. If our dated copies are still useful to you after that, ask and we will send what we hold.
How do I know these numbers are real?
Look up hv75020387 in the USGS catalog and you will find a real event with a magnitude of 1.75. The other half — what it said before — is what our seals hold, and it is the half we cannot show you on a web page.
What we send is the copy itself with the date we sealed it, not our summary of it. Where our copy is missing a day inside the window you asked for, the file names that day rather than skipping over it.
Do you hold the day I need?
Probably not for every date you want, and we say which up front.
We seal what we sealed. There are days inside our range with no copy, and the file you get names each one. Send us the event id and we will tell you which seals exist for it in a two-line reply.
What can you tell me about one event?
Name it by its event id and we tell you what USGS asserted at each seal we hold, and which days in its range we hold nothing for. A date window works too. There is no charge for any of it — email us.
You are a small company. What if you stop?
It would not change what we already sealed. This collector was switched off for a stretch, and on 23 Aug 2026 we turned it back on by a dated decision, so it is reading again now. Either way, what this page describes is dated copies we already hold.
It is a one-time file out of copies already taken, not a subscription to new ones. What we send is a plain file you keep that still opens if we are not here next year. Our oldest copy is 23 Jun 2026 and our newest is 24 Aug 2026, and there are 8 days inside that range we hold nothing for — 4 Jul, 15 Jul, 14 to 17 Aug, 22 Aug and 23 Aug. We name those up front.
Email operations@ustechautomations.com with an event id and we tell you what we hold for it. Not for sale — USGS publishes this history itself.