4.130 Pousse et al. (2005)

• Ground-motion model is:

  Select this form to compare results with Berge-Thierry et al. (2003).

• Use five Eurocode 8 categories:

  A

  V _s,30 > 800m∕s, use S₁

  B

  360 < V _s,30 < 800m∕s, use S₂

  C

  180 < V _s,30 < 360m∕s, use S₃

  D

  V _s,30 < 180m∕s, use S₄

  E

  Soil D or C underlain in first 20m by a layer of V _s,30 > 800m∕s, use S₅

  where V _s,30 is average shear-wave velocity in upper 30m. Since soil profiles only available up to 20m, use method of Atkinson and Boore (2003) to assign sites to categories using Kik-Net profiles to define probability curves. Generate five redistributions to test stability of results. Find coefficients and σ relative stable (changes less than 10%) except for site class A (changes up to 50%.

• Response parameter is pseudo-acceleration for 5% damping.
• Use data from the K-Net and Kik-Net networks.
• Process records using non-causal 4 pole Butterworth filter with cut-offs of 0.25 and 25Hz for consistency with earlier studies.
• Select records from events with M_w > 4 and with focal depth < 25km to exclude records of subduction events and to remain close to tectonic conditions in France.
• Exclude records from distances greater than a the distance predicted by a magnitude-dependent equation predicting the location of a PGA threshold of 10cm∕s2 (corresponding to trigger of older Japanese sensors) to prevent possible underestimation of attenuation rate.
• Visually inspect records to check for glitches and to use only main shock if multiple events present.
• Convert M_JMA to M_w to compare results with other studies.
• For 10 large earthquakes for which source dimensions are known use r_rup.
• Note good distribution w.r.t. M_w and r_rup except between 6.1 and 7.3 where only two events.
• Find that pseudo-acceleration at 0.01s equals PGA.
• Also compute coefficients using geometric mean and find identical coefficients and standard deviations lower by 0.02.
• Find σ lower when use five site classes than when no site information is used.
• Find peak in σ at about 1s. Peak also present when unfiltered data used. Also present when data from different magnitude ranges (4.0–4.5, 4.0–5.0, 4.0–5.5 and 4.0–6.0) are used.
• Note that results for site class E are uncertain due to limited number of records.
• Examine residuals w.r.t. distance and magnitude and find no significant bias.
• Examine quartile plots of residuals and find that residuals are normally distributed up to 2–4 σs. All pass Kolmogorov-Smirnov test at 5% significance level for normality except at 0.01s.
• Conducted sensitivity analysis by changing minimum magnitude, geographical area and minimum number of events recorded at each station. Find dependence of σ on period was similar as were site coefficients. b shows some variations.
• Coefficients not reported.