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USGS Earthquake Catalog API boundary

Official-source access, authentication, request-shaping, paging, freshness, legal, and interpretation boundaries for USGS Earthquake Catalog API.

version 1.0.0freshness currentobserved 2026-08-27T08:40:00Z

resource.public-data.usgs-earthquake-catalog-api
sha256:3f7ee2988a39715bb4d6ff95949d80c21dfa22d45247cc2fdf430eaa9281934d

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Evidence-backed facts

  1. The USGS FDSN Event Web Service supports catalog discovery, counts, version checks, and filtered earthquake queries in several formats. informative
  2. Catalog queries are limited to 20,000 events and should use count, time, magnitude, geography, ordering, limit, and offset deliberately. informative
  3. USGS recommends real-time GeoJSON feeds instead of repeated catalog searches for display applications that need current earthquake information. informative
  4. Preferred catalog values and event parameters can be updated, so a response is not immutable seismic truth or a substitute for official hazard guidance. informative