usgs/earthquakes·Available

Global Earthquake Catalog

When an earthquake happens anywhere on Earth, USGS seismic sensors detect it and log the details here. You get the exact location, how deep it was, how strong it was, and when it hit. The catalog goes back 30 days and updates constantly as new earthquakes are recorded. If you're tracking seismic activity, researching earthquake patterns, or just want to know what shook where today, this is where that raw data lives.

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Source and methodology

Publisher

USGS

government

Type: government
Scope: us federal
Updates: scheduled
License: License not specified

How this data is collected

Data from global seismic networks; only magnitude 2.5+ events included for reliable detection.
Location triangulated from arrival times at multiple stations; magnitude calculated using amplitude and frequency.
Real-time updates as events are detected and processed; 30-day rolling window.
Events can be revised as more station data arrives; magnitudes may be updated within hours of initial report.

What to watch out for

Minimum magnitude threshold (2.5) means smaller earthquakes are not included, even though they occur frequently.
Very remote earthquakes may have larger errors in location and magnitude due to sparse station coverage.
Earthquake locations are refined over time as more seismic station data arrives; initial reports may shift by several kilometers.
Magnitude calculations vary by network and method used, so multiple magnitude values may exist for the same event.
Data limited to past 30 days; historical catalog requires separate USGS archives.
Some regions with poor seismic station networks have larger uncertainties in depth and location.

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