This PDF file includes:

• Supplementary Methods
  
• fig. S1. Maximum magnitude expected during 1900 years of tectonic earthquake activity in Oklahoma.
  
• fig. S2. Saltwater injection and earthquake rate in CO.
  
• fig. S3. Saltwater injection and earthquake rate in WO.
  
• fig. S4. Observation and prediction of induced seismicity in CO.
  
• fig. S5. Observation and prediction of induced seismicity in WO.
  
• fig. S6. Annual magnitude exceedance probability and maximum magnitude in CO.
  
• fig. S7. Annual magnitude exceedance probability and maximum magnitude in WO.
  
• fig. S8. Annual magnitude exceedance probability and maximum magnitude.
  
• fig. S9. Cumulative magnitude exceedance probability and maximum magnitude in CO and WO (2009 to September 2016).
  
• table S1. Recent magnitude 4.5 and larger earthquakes in Oklahoma.
  
• References (28, 29)

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