Modeling of the Sedimentary Interbedded Basalt Stratigraphy for the Idaho National Laboratory Probabilistic Seismic Hazard Analysis

Payne, Suzette

Idaho National Laboratory

关键词: Seismic Hazard;    Attenuation;    Sediments;    Ground Motion;    Basalt;   

DOI  :  10.2172/911574
RP-ID  :  INL/EXT-05-01047
RP-ID  :  DE-AC07-99ID-13727
RP-ID  :  911574

美国|英语

来源: UNT Digital Library

【 摘 要 】

This report summarizes how the effects of the sedimentary interbedded basalt stratigraphy were modeled in the probabilistic seismic hazard analysis (PSHA) of the Idaho National Laboratory (INL). Drill holes indicate the bedrock beneath INL facilities is composed of about 1.1 km of alternating layers of basalt rock and loosely consolidated sediments. Alternating layers of hard rock and “soft” loose sediments tend to attenuate seismic energy greater than uniform rock due to scattering and damping. The INL PSHA incorporated the effects of the sedimentary interbedded basalt stratigraphy by developing site-specific shear (S) wave velocity profiles. The profiles were used in the PSHA to model the near-surface site response by developing site-specific stochastic attenuation relationships.