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:
y, 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 surveying to identify and measure short-term crustal movements (Refs. D.4 and D.5) and (2) geological analyses such as analysis of regional dissection and degradation pat terns, marine and lacustrine terraces and shorelines, fluvial adjustments such as changes in stream longitu dinal profiles or terraces, and other long-term changes such as elevation changes across lava flows (Ref. D.6). D.2.3.1.4. Analysis of offset, displaced, or anomalous landforms such as displaced stream chan nels or changes in stream profiles or the upstream migration of knickpoints (Refs. D.7 through D.12); abrupt changes in fluvial deposits or terraces; changes in paleochannels across a fault (Refs. D.11 and D.12); or uplifted, downdropped, or laterally displaced marine terraces (Ref. D.12). D.2.3.1.5. Analysis of Quaternary sedimentary deposits within or near tectonic zones, such as fault zones, including (1) fault-related or fault-controlled de posits such as sag ponds, graben fill deposits, and collu vial wedges formed by the erosion of a fault paleoscarp and (2) non-fault-related, but offset, deposits such as al luvial fans, debris cones, fluvial terrace, and lake shore line deposits. D.2.3.1.6. Identification and analysis of de formation features caused by vibratory ground mo tions, including seismically induced liquefaction fea tures (sand boils, explosion craters, lateral spreads, settlement, soil flows), mud volcanoes, landslides, rockfalls, deformed lake deposits or soil horizons, shear zones, cracks or fissures (Refs. D.13 and D.14). D.2.3.1.7. Analysis of fault displacements, such as by the interpretion of the morphology of topographic fault scarps associated with or produced by surface rup ture. Fault scarp morphology is useful in estimating the age of last displacement (in