Contrasts Between Short- and Long-Term Records of Seismicity in the Rio Grande Rift – Important Implications for Seismic Hazard Assessments in Areas of Slow Extension

PDF icon Download PDF
Date Published: 
January 1998

The Rio Grande rift has a relatively short and unimpressive record of historical seismicity. However there is abundance evidence of prehistoric (Quaternary) surface faulting associated with large (M>6) earthquakes. This paradox between historical and prehistoric seismicity (paleoseismicity) has important implications for seismic-hazards analyses based primarily on modern seismicity.

Reference Information: 

Machette, M.N., 1998, Contrasts between short- and long-term records of seismicity in the Rio Grande rift – Important implications for seismic hazard assessments in areas of slow extension, in W.R. Lund (ed.), Western States Seismic Policy Council Proceedings Volume, Basin and Range Province Seismic Hazards Summit, Utah Geological Survey Miscellaneous Publication 98-2, p. 84-95.

Cited In: 
GPO - Appendix I

*This PDF document is not Section 508 accessibility compliant. If you require accessibility assistance, please contact us to Request Assistance.

EIS Status Update - Mar 2019

As of March 15, a Draft EIS update is now available under the ‘Public Involvement’ tab. To view the update, click here.

EIS Timeline - Feb 2019

  1. Proponent submits revised Plan of Operations [Sep 2014]
  2. Federal Register Notice of Intent to prepare EIS [Mar 2016]
  3. Public scoping period and scoping meetings
    [5 meetings between Mar-Jun 2016; comment period extended from 60 days to 120 days, closed Jul 18, 2016 ]
  4. Compile and review existing data
  5. Prepare project description and identify project alternatives
  6. Publish Alternatives Evaluation Report [Sep 2017]
  7. We Are Here
    Validate Baseline Information; analyze environmental effects
  8. Prepare Draft EIS
  9. Federal Register Notice of Availability of Draft EIS
  10. 90-day public review and comment period, with public meetings
  11. Respond to public comments and prepare Final EIS
  12. Federal Register Notice of Availability of Final EIS and Draft ROD
  13. 45-day Public Objection Period
  14. Resolve objections to Final EIS and draft ROD
  15. Issue Final Record of Decision

[ View Larger Version ]

Forest Points of Contact

Media & General Info
John Scaggs
jscaggs@fs.fed.us

Project Manager
Resolution Copper
Mary Rasmussen
mcrasmussen@fs.fed.us

Apache Leap Special Management Area
Apache Leap SMA website