Design basis earthquakes for the Lawrence Livermore Laboratory site.

Abstract

A thorough review of the geology and past seismic history of the area surround ing the Lawrence Livermore Laboratory site is given. This information is used to identify those active faults on which destructive earthquakes could occur. Earthquake magnitudes are assigned to these postulated earthquakes, and the approaches used to assign magnitudes are discussed. Estimates of maximum possible ground This report will define the earthquake hazard to which the facilities at the Lawrence Livermore Laboratory in Livermore, California might be subjected. The location and magnitude of earthquakes that could cause damage to Laboratory facilities will be postulated and ground motions at the Laboratory site resulting from these postulated earthquakes de veloped. These site ground motions are described in terms of maximum ground acceleration (peak g level), acceleration response spectra, duration, and accelerograms. Unfortunately, defining earthquake hazard for structural design calculations is not subject to the same degree of cer tainty or the same exercise of judgment as are methods of design analysis. For this acceleration, response spectra, and duration of the strong shaking at the Laboratory site resulting from the postu lated earthquakes are given. A discussion of the methods used to predict these quantities is also presented. Using the foregoing information, design-basis earthquakes, which define the ground motion for Laboratory structural design purposes, are devel oped. reason, such factors as risk evaluation, probability, economics, and good engi neering judgment are essential elements in earthquake engineering design pro cedures. Definitive results cannot be given and considerable judgment must be used; however, this study will develop reasonable estimates of the maximum ground shaking to which the Laboratory facility could be subjected, an estimate of the possibility of suca occurrences, and a design-basis earthquake (DBE) with general comments on its-ilication to structural design. Considerable detail as to the methods used in the development of the estimates and the DBE will be given. Although many investigators have studied the probability of occurrence of earthquakes, their studies are not yet

Deaggregation of Probabilistic Seismic Hazard for Designated Cities in Ghana

“…This data was used in the seismic hazard calculation, in which we considered the minimum magnitude to be M W = 4.0 for the entire Ghanaian region while the Mmax values vary signi cantly. Where Beta (β) -b-value x ln (10); M min -lower bound magnitude; Lamda (λ) -the yearly number of the seismic event above the lower bound magnitude; M max -maximum expected upper bound magnitude…”

“…The approach used in this study permits the identi cation of the modal (Chapman 1995), or the domineering seismic events (Bazzurro and Cornell 1999), the so-called control factors (Bernreuter 1992), and the design drive (McGuire 1995), for each studied location. The controlling earthquake is usually well-de ned in terms of the value of the modal for the magnitude distribution as well as that of the epicentral distance.…”

“…Nevertheless, the distance-magnitude group which matches up to the modal values signi cantly contributes to the hazard and as a result, relates more to authentic sources (Barani et al 2009). Bernreuter (1992) proposed expressions that were applied in this study for the estimation of the values of the modal for magnitudes (M) and distances (D) (Barani et al 2009).…”

“…The values of the PSHA can be sorted out and developed to de ne the main hazard contributing seismic source through the process of deaggregation (Harmsen and Frankel 2001). Bernreuter (1992) carried out the rst study on the deaggregation of seismic hazards after which, deaggregation studies became widely functional, deliberated, and enhanced by numerous writers. (e.g.…”

Earthquake analysis of the diagnostic chemistry building, Lawrence Livermore Laboratory.

“…The geology, faulting, and seismicity of the area have been thoroughly reviewed and discussed in Ref. 1. The review was based solely on a literature search of the geology, faulting, and seis micity of the area.…”