Document: NUREG-0800
Document ID: 74980693-f1d2-4f59-a418-b297e1cc6509
Document Type: srp
Title: SURFACE FAULTING
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0707/ML070730597.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.5.3
CFR Part: 
CFR Title: 

Content:
soil materials and rock core in boreholes, and geologic mapping of trenches and test pits to define paleoseismic features and fault surfaces) investigations. 2.5.3-8 Revision 4 - March 2007 Nature of geologic, seismic and paleoseismic, geophysical, and geotechnical investigations to determine whether or not undetected fault displacements or other tectonic deformation features (e.g., folds related to blind faults) are likely to exist will vary in degree of detail and extent required based on geologic complexity of the specific site. In the Central and Eastern United States (CEUS) region, defined as that part of the United States east of the Rocky Mountain Front, with the exception of the New Madrid Seismic Zone of the Central Mississippi Valley (extending from northeast Arkansas, southeast Missouri, western Tennessee, and western Kentucky to southern Illinois), the Meers Fault in southwestern Oklahoma, and the Cheraw fault in eastern Colorado, earthquake-generating faults either do not extend to the ground surface or there is insufficient overlying soil or rock for reliable age dating. In the Western United States, many capable faults are exposed at the ground surface and can be more readily characterized with respect to seismic hazard potential. In the Western region, capable tectonic sources (including faults related to subduction zones) also exist as blind faults which may be expressed at the surface or near-surface only by folding, uplift, or subsidence, and these phenomena should be taken into account by an applicant for a site located in that region. 3. Correlation of Earthquakes with Capable Tectonic Sources. Requirements of GDC 2 in Appendix A of 10 CFR Part 50, 10 CFR 52.17, and 10 CFR 100.23 are met for this area of review if all reported historical earthquakes within the site vicinity are evaluated with respect to accuracy of hypocenter location and source of origin, and if all capable tectonic sources that could, based on fault orientation and length,