Data Changelog

A dated public record of data corrections, refreshes, and methodology changes on PlainQuake. Every entry below reflects a real, verifiable change; we do not backfill or invent entries. See our editorial & corrections policy for how we handle reports, or report a data issue yourself. Data current as of 2026-07-19.

1. July 19, 2026 · Data refresh

   Rebuilt the catalog from the latest USGS ComCat snapshot.

2. July 16, 2026 · Data correction

   Removed fabricated claims and stale data-vintage badges found on a small number of pages during an internal quality review.

3. July 11, 2026 · Data correction

   Corrected a guide page that overstated the completeness of its M9+ earthquake list.

4. July 5, 2026 · Data correction

   Corrected several pages that displayed a stale, hardcoded "last refreshed" date instead of the actual data-refresh date.

5. July 3, 2026 · Data correction

   Found and corrected over 5 months of missing 2026 earthquake data, caused by a raw source file that had not been re-fetched since March. The catalog grew from 310,010 to 314,636 M4+ events (+4,626) and 14,334 to 14,420 significant M6+ events (+86) after the fix.

6. June 25, 2026 · Data correction

   Rewrote a research page that had been generated with fabricated figures (including an incorrect claim about a 1964 Prince William Sound M9.2 event) with figures verified directly against the live catalog.

7. June 21, 2026 · Editorial correction

   Corrected the site’s author attribution to accurately reflect an editorial team, replacing an incorrectly credited named reviewer.

8. June 15, 2026 · Methodology update

   Expanded the documentation of our data-sourcing and verification process on the methodology page.

9. March 30, 2026 · Site launch

   Published the initial methodology and FAQ pages.