Free APIOpen DataNo keyOfficial

USGS Earthquake Catalog (FDSNWS)

Real-time + historical earthquakes as GeoJSON, no key

The USGS Earthquake Hazards Program publishes real-time and historical earthquake data via auto-updating GeoJSON feeds and a queryable FDSN event web service (ComCat catalog). Filter by time, magnitude, location, and depth. Returns GeoJSON, QuakeML, CSV, KML, or text. Completely free and keyless.

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Free tier

Free, no key

Rate limits

Not published; very large queries (over ~20k events) are rejected, so window your time ranges

Auth

No key

Base URL

https://earthquake.usgs.gov

What you'd build with it

Real-time earthquake alerting via the pre-built GeoJSON feeds
Map seismic events for a hazards or news dashboard
Query historical quakes by region and magnitude for analysis
Trigger an automation when a significant quake occurs

Key endpoints

GET/fdsnws/event/1/query?format=geojson&starttime={t}&endtime={t}Custom event search by time/mag/geo
GET/earthquakes/feed/v1.0/summary/{feed}.geojsonPre-built real-time feeds (e.g. significant_day, 2.5_week)
GET/fdsnws/event/1/count?starttime={t}Count matching events (to size a query)

Members

Members get the runnable recipe

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