Document: NUREG-0800
Document ID: 00118dbb-66c3-44da-ae4f-ef4e1d519a67
Document Type: srp
Title: -12
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1230/ML12302A003.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.5.3
CFR Part: 
CFR Title: 

Content:
investigations, borings, or trenching) shall be carried out to adequately characterize the deformation features The distinction should be made between tectonically-induced surface deformation and non- tectonic surface deformation resulting from growth faulting or collapse due to limestone or salt dissolution or salt diapirism). In addition to geologic evidence that might indicate deformation, topographic and geomorphic evidence should be examined and their use documented (e.g. linear features interpreted from topographic maps, low and high altitude aerial photographs, satellite imagery, LiDAR). Data to assess presence of surface deformation is obtained by an applicant from surface methods such as: imagery analysis, geologic reconnaissance and mapping and subsurface methods such as geophysical surveys at ground surface as well as in boreholes; geologic and geotechnical logging of soil materials and rock core in boreholes, and geologic mapping of trenches and test pits to define paleoseismic features and fault surfaces (including growth faults) or collapse features. The nature and extent of investigations to determine whether or not shallow subsurface deformation features exist (e.g., blind faults, folds related to blind faults, growth faults, dissolution caverns, salt diapirism) are likely to exist will vary in degree of detail and extent required based on geologic context of the specific site. In the central and eastern United States (CEUS) region, defined in NUREG-2115, earthquake-generating faults typically do not extend to the ground surface or there is insufficient overlying Quaternary soil or rock to constrain the timeing of deformation. In the Western United States, many Quaternary faults are exposed at the ground surface and might be more readily characterized with respect to surface deformation potential if appropriately aged geologic formations or units exist at the site of deformation. Tectonic