- Ground-motion model is:
Coefficients not reported.

- Use V
_{s,30}to characterise sites. Distribution w.r.t. NEHRP classes: A (6 records), B (399), C (2405), D (1022) and E (42). - Study the influence of uncertainties in estimates of V
_{s,30}on model (coefficients and σ). Propose regression technique, based on generalized least-squares and maximum-likelihood approaches, to account for variable accuracy of V_{s,30}estimates. - Approach allows estimation of site-specific σ for use when V
_{s,30}is known to different accuracies (e.g. specified only by class or specified by measured V_{s}profile). Find that this approach leads to lower σ for well-characterised site than one that is poorly known. - Test procedure using the Joyner and Boore (1981) dataset, excluding the site term, since this allows comparison to previous results. Find very close match to results of Joyner and Boore (1993).
- Use data from KiK-Net provided by Cotton et al. (2008) and Rodriguez-Marek and Montalva (2010). Lack of data from large earthquakes.
- Data from 537 stations.
- State that objective is not to develop models for use in hazard assessments but to show impact of measurement uncertainty on model.
- Undertake various regressions assuming different uncertainties in V
_{s,30}, including uniform for all sites and individual. When uniform uncertainties are assumed, coefficients unchanged but σ_{s}(inter-site) decreases but the other components are unaltered. Find coefficients largely insensitive to assumption of non-uniform uncertainties but again σ_{s}decreases. - Discuss the use of the variance components in the context of seismic hazard assessment. Even if σ
_{s}has decreased have to consider the measurement error when computing total σ, which is unchanged in the case of uniform uncertainties in V_{s,30}but decreases if know V_{s,30}more accurately. Allows discrimination between aleatory variability and epistemic uncertainty.