Implements GMPE developed by Climent, A, W. Taylor, M. Ciudad Real, W. Strauch, M. Villagran, A. Dahle, and H. Bungum. Published as a NORSAR report: “Spectral strong motion attenuation in Central Ame- rica”, NORSAR Technical Report No. 2-17, 46 pp. The original formulation predict PGA (m/s*s) and 5% damped PSV (m/s) for the largest component of horizontal ground motion. In this implementation: Spectral acceleration (SA) values are obtained from PSV ones using the following formula :
SA = [PSV * (2 * pi/ T)]/ratio(SA_larger/SA_geo_mean) StdDev.TOTAL=StdDev.TOTAL/sd_ratio(SA_larger/SA_geo_mean)
The ratio() and sd_ratio() from Beyer and Bommer(2006)
Equation coefficients, described in Table 4.1 on pp. 22 the original imt values are defined as frequencies values the sigma_ls was excluded
Supported intensity measure component is the largest component of two horizontal components openquake.hazardlib.const.IMC.GREATER_OF_TWO_HORIZONTAL, see paragraph before table on Summary, page 1.
Supported intensity measure types are spectral acceleration, and peak ground acceleration. See Table 2 in page 1865
Supported standard deviation types is total. See equation 1 on the Summary and Table 4.1, page 22.
Supported tectonic region type is active shallow crust and/or interface subduction the authors did not distinction between shallow and sudbdution events (see topic 5.3 “Shallow crustal vs.subduction events, pag. 32). Any factor/parameter is used in the formulation to discriminate between shallow or interface tectonic regime, here this GMPE is implemented for active_shallow_crust only
Required distance measure is Rhypo, explained in page 1(eq. 1)
Required rupture parameters are magnitude.
Required site parameters. The GMPE was developed for rock and soil site conditions. The parameter S in eq. 1 (see Summary) define the soil condition: S=0 for rock, S=1 for soil. Here we use the Vs30=760 as limit between the two soil conditions