##
Electronic Supplement to

Regional Correlations of V_{S30} and Velocities Averaged Over Depths Less Than and Greater Than 30 m

### by David M. Boore, Eric M. Thompson, and Héloïse Cadet

###
Estimates of V_{S30} at K-NET stations

**Table S1.**
A csv file with V_{S30} values for K-NET stations, estimated from
the equations relating V_{S30} to V_{SZ} in Table 2 of the text, derived from KiK-net models,
and in Table 2 of Boore (2004),
derived from California velocity models. In these estimations *z* is the depth to the bottom of the velocity model at each site (*zmax*).
The file includes the following columns, with the units indicated at the end of each description:

- station name (
*sta*)
- depth to the bottom of the model (
*zmax*), m.
- velocity of the layer at the bottom of the model (
*vmax*), m/s.
- travel time from the surface to
*zmax*, s.
- time-averaged velocity from the surface to the bottom of the model (
*vavg*), s.
- V
_{S30} estimated by assuming that *vmax* continues to 30 m (the "constant-velocity" extrapolation), m/s.
- V
_{S30} estimated from the KiK-net equations, m/s.
- V
_{S30} estimated from the California equations, m/s.
- V
_{S30} estimated as a weighted combination of the estimates from the KiK-net and the California equations,
where the weighting equals unity for the KiK-net estimates if *zmax* is less than or equal to 10 m, unity
for the California estimates if *zmax* is greater than or equal to 20 m,
with linear weighting between these two values for *zmax* between 10 m and 20 m. The motivation for this justification
is given in the text of the article, m/s.
- ratio of V
_{S30} from the combined estimate and the constant-velocity extrapolation
- ratio of V
_{S30} from KiK-net equations and the California equations

**Table S2.**
A csv file containing names of those K-NET stations without valid velocity models.

**Figure S1.**
Histograms of the various estimates of V_{S30} at K-NET stations;
also shown are the lines corresponding to 10, 50, and 90 percentiles of the combined estimates. The mean of the log values of the combined estimates
is the equivalent of 337 m/s (log values are shown in the graph because the V_{S30} values have a log-normal distribution, as shown in the article).

**Figure S2.**
The histograms of the
ratios of the various estimates of V_{S30}.
"KiK", "Cal", "Combined", and "Xtrap" are estimates from the KiK-net equations, the California equations,
the weighted combination of those estimates (see above)
and the constant-velocity extrapolation, respectively.

### References

Boore, D. M. (2004). Estimating V_{S}(30) (or NEHRP Site Classes) from shallow velocity models (depths < 30 m),
*Bull. Seismol. Soc. Am.* **94**, 591-597.

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