Active Tectonics of Northeastern Sonora, Mexico (Southern Basin and Range Province) and the 3 May 1887 Mw 7.4 Earthquake
North–south-striking and west-dipping Basin and Range province normal faults form the western edge of the Sierra Madre Occidental plateau in northeastern Sonora. These faults and associated half-grabens extend over a distance of more than 300 km between the San Bernardino basin in the north and the Sahuaripa basin in the south. An earthquake in 1887 ruptured three neighboring segments of this major fault zone. Our field mapping in this region indicates that the surface rupture of the 1887 earthquake extends farther to the south and is considerably longer (101.4 km end-to-end length) than previously reported.
Suter, M., and J. Contreras. 2002. Active tectonics of northeastern Sonora, Mexico (southern Basin and Range Province) and the 3 May 1887 MW 7.4 earthquake. Bulletin of the Seismological Society of America 92(2):581-589.
Suter, M., and J. Contreras. 2002. Active tectonics of northeastern Sonora, Mexico (southern Basin and Range Province) and the 3 May 1887 MW 7.4 earthquake. Bulletin of the Seismological Society of America 92(2):581-589.
*This PDF document is not Section 508 accessibility compliant. If you require accessibility assistance, please contact us to Request Assistance.
Email Address Created for Land Exchange Questions
The Southwestern Region Office of Lands and Minerals Management is overseeing and administering the land exchange and appraisal process which includes the 2,422-acre Oak Flat Federal Parcel. All questions about the land exchange and appraisal process should be emailed to SM.FS.rcexinfo@usda.gov
Programmatic Agreement Info
To comply with Section 106 of the National Historic Preservation Act, the Tonto National Forest developed a Programmatic Agreement (PA) and included it in Volume 5, Appendix O of the final EIS. The PA was created in cooperation with the Advisory Council on Historic Preservation, the State Historic Preservation Office, tribes and other consulting parties. The PA contains an agreed upon process for identifying, evaluating and addressing adverse effects to historic properties associated with this undertaking.
To review Volume 5 and the PA, Download Vol 5 PDF, 27 MB.
Forest Service Point of Contact
John Scaggs
Tonto National Forest
john.scaggs@usda.gov
Apache Leap Special Management Area
Apache Leap SMA website