- Ground-motion model is:
where PGA is in m∕s2, a = -2.268 ± 0.356, b = 1.276 ± 0.026, c = -3.528 ± 0.624, d = 0.053 ± 0.029,
h = 3.5, e = 0.218 ± 0.014 and σ = 0.324.
- Use 2 site classes, corresponding to S = 0 and S = 1, but classes not defined in article.
- Use data from The Geysers vapour-dominated geothermal field recorded from 01/09/2007 to 15/11/2010
by 29 stations of the network of Lawrence Berkeley National Laboratory Geysers/Calpine seismic network.
Select earthquakes with focal depths ≤ 6km
to limit data to induced seismicity only. Do not use PGAs from COBB, ADSP and GCVB from 2009,
which retain for comparison to results of time-dependent hazard assessment. Based on pre-processing select
best quality data, i.e. those earthquakes with ≥ 20 P picks and those records with a signal-to-noise ratio
- Apply instrument-correction within frequency band 1–25Hz.
- Derive model to compute time-dependent seismic hazard.