Document: NUREG-0800
Document ID: 0aae61db-7b6a-4282-b300-9f5ef95e1f37
Document Type: srp
Title: Seismicity.  To meet the requirements in 10 CFR 100.23, this subsection is
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1331/ML13316C066.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.5.2.1
CFR Part: 
CFR Title: 

Content:
acceptable when the complete historical catalog of earthquakes in the region is listed and when all available parameters are given for each earthquake in the historical record. The listing should include all earthquakes having Modified Mercalli Intensity (MMI) greater than or equal to IV or moment magnitude greater than or equal to 3.0 that have been reported within 320 km (200 miles) of the site. Large earthquakes outside of this area that potentially would impact the SSE should be reported. A regional-scale map should be presented showing all listed earthquake epicenters and should be supplemented by a larger-scale map showing earthquake epicenters of events within 80 km (50 miles) of the site. The following information concerning each earthquake should be provided whenever it is available: epicenter coordinates depth, date, origin time, highest intensity, magnitude, seismic moment, source mechanism, source dimensions, distance from the site and any strong-motion recordings (sources from which the information was obtained should be identified). All magnitude designations such as mb, ML, Ms, Mw should be identified. In the CEUS, relatively little information is available on magnitudes for historic earthquakes which are reported but for which there are no instrumental recordings; hence, it may be appropriate to rely on intensity observations (descriptions of earthquake effects) or the dimensions of the area in which the event was felt to estimate magnitudes of historic events, as described in EPRI Report TR-102293 and NUREG-2115, “Central and Eastern United States Seismic Source Characterization for Nuclear Facilities.” In addition, any reported earthquake-induced geologic failure, such as liquefaction (including paleoseismic evidence of large prehistoric earthquakes), landsliding, landspreading and lurching should be described completely, including the estimated level of strong motion that induced failure and the physical properties of the materials. The