Displacement across the Cholame Segment of the San Andreas Fault between 1855 and 1893 from Cadastral Surveys
Changes since 1855 in reported section-line lengths and positions of survey monuments that span the San Andreas fault (SAF) were used to measure displacement interpreted to be from the 1857 Fort Tejon earthquake in south-central California. In 1855–1856 James E. Freeman established township and range lines across the SAF between Rancho Cholame and the northern Carrizo Plain. At least 26 1-mile sections lines spanned the SAF in the area between present-day California Highways 46 and 58. Each section line was marked by monuments at the midpoint and endpoints. Section lines across portions of the SAF were resurveyed in 1893 by J. M. Gore. We projected changes in line length onto the fault zone to measure displacement.
Runnerstrom, E.E., Grant, L.B., Arrowsmith, J.R., Rhodes, D.D., and Stone, E.M., 2002, Displacement across the Cholame segment of the San Andreas Fault between 1855 and 1896 from cadastral surveys: Bulletin of the Seismological Society of America: v. 92, p. 2,659- 2,669.
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.firstname.lastname@example.org
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.