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Our Sources

Every feed, channel and instrument we read, live, and the rules we read them by.

• Every source we read, liveLive

  Every feed, channel and instrument behind the map, whether it is answering, and when each last reported.

• How we tell a quiet source from a dead one

  A source is heard when it produced something we read, not when it answered a request.

• Why some earthquakes are not on the map

  We map earthquakes above USGS's own significance threshold, and above a magnitude we set for EMSC.

• Source policy

  We name sources, link to their reporting and state affiliations; channels of one publisher are not independent.

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