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- W265311162 abstract "The occurrence of the damaging 1983 M[sub w] 6.8 Borah Peak, Idaho earthquake, which ruptured a central segment of the Lost River fault, has increased the awareness of seismic hazards in this portion of the Northern Basin and Range Province (NBR). As a result, comprehensive deterministic and probabilistic seismic hazard analyses were performed for the Idaho National Engineering Laboratory (INEL) which is located within the eastern Snake River Plain (ESRP) but adjacent to the NBR. In this region, the most significant seismic sources are three late-Quaternary NBR normal faults, the Lost River, Lemhi and Beaverhead faults, and ESRP volcanic zones. For each source, the maximum earthquake, source geometry, recurrence and their uncertainties were estimated and incorporated into the probabilistic analysis through the use of logic trees. Recent paleoseismic trenching of the Lost River and Lemhi faults and volcanic mapping in the ESRP provided much of the data necessary to characterize the most significant seismic sources. Issues such as fault segmentation, temporal clustering, the nature of fault termination, and the maximum magnitude and recurrence of volcanic zone earthquakes were evaluated in the hazard analyses. Deterministic and probabilistic ground motions were computed using both empirical and stochastic approaches. In the deterministic analysis,more » the southern segments of the Lemhi fault controlled the hazard at the INEL due to their proximity and potential to generate M[sub w] [approximately]7 earthquakes. In the estimation of deterministic ground motions, potential rupture scenarios were evaluated for a Lemhi earthquake. In the probabilistic analysis, the hazard is dominated by the ESRP random earthquake, and the Lemhi and Lost River faults. The difference in the results of the two analyses points out the uncertainties in assessing seismic hazards due to random earthquakes and in regions of large but infrequent earthquakes.« less" @default.
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- W265311162 date "1993-04-01" @default.
- W265311162 modified "2023-09-28" @default.
- W265311162 title "Seismic hazards astride the boundary between the eastern Snake River Plain and northern Basin and Range Province Idaho" @default.
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