Document: NRC Regulatory Guide
Document ID: cfc61809-5745-460f-8a26-13c168659924
Document Type: regulatory_guide
Title: Identification and Characterization of Seismic Sources and Determination of Safe Shutdown Earthquake Ground Motion
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML0037/ML003740084.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.165
CFR Part: 
CFR Title: 

Content:
tailed list of possible sources of information is given in Regulatory Guide 1.132 (Ref. D.3). D.2.3 Detailed Site Vicinity and Site Area Investigations The following methods are suggested but they are not all-inclusive and investigations should not be limit ed to them. Some procedures will not be applicable to 1.165-32 K every site, and situations will occur that require inves tigations that are not included in the following discus sion. It is anticipated that new technologies will be available in the future that will be applicable to these investigations. D.2.3.1 Surface Investigations Surface exploration needed to assess the neotec tonic regime and the geology of the area around the site is dependent on the site location and may be carried out with the use of any appropriate combination of the geo logical, geophysical, seismological, and geotechnical engineering techniques summarized in the following paragraphs and Ref. D.3. However, not all of these methods must be carried out at a given site. D.2.3.1.1. Geological interpretations of aerial photographs and other remote-sensing imagery, as ap propriate for the particular site conditions, to assist in identifying rock outcrops, faults and other tectonic fea tures, fracture traces, geologic contacts, lineaments, soil conditions, and evidence of landslides or soil liquefaction. D.2.3.1.2. Mapping of topographic, geologic, geomorphic, and hydrologic features at scales and with contour intervals suitable for analysis, stratigraphy (particularly Quaternary), surface tectonic structures such as fault zones, and Quaternary geomorphic fea tures. For offshore sites, coastal sites, or sites located near lakes or rivers, this includes topography, geo morphology (particularly mapping marine and fluvial terraces), bathymetry, geophysics (such as seismic re flection), and hydrographic surveys to the extent need ed for evaluation. D.2.3.1.3. Identification and evaluation of verti cal crustal movements by (1) geodetic land