Implements GMPE developed by G. R. Toro, N. A. Abrahamson, J. F. Sneider and published in “Model of Strong Ground Motions from Earthquakes in Central and Eastern North America: Best Estimates and Uncertainties” (Seismological Research Letters, Volume 68, Number 1, 1997) and “Modification of the Toro et al. 1997 Attenuation Equations for Large Magnitudes and Short Distances” (available at: http://www.riskeng.com/downloads/attenuation_equations) The class implements equations for Midcontinent, based on moment magnitude. SA at 3 and 4 s (not supported by the original equations) have been added in the context of the SHARE project and they are obtained from SA at 2 s scaled by specific factors for 3 and 4 s.
Coefficient tables obtained by joining tables 2, 3, and 4, pages 47, 50, 51.
Supported intensity measure component is the geometric mean of attr:~openquake.hazardlib.const.IMC.AVERAGE_HORIZONTAL,
Supported intensity measure types are spectral acceleration, and peak ground acceleration, see table 2 page 47.
Supported standard deviation type is only total.
Supported tectonic region type is stable continental crust, given that the equations have been derived for central and eastern north America
Required distance measure is rjb, see equation 4, page 46.
Required rupture parameter is only magnitude.
No site parameters required
Coefficients for faulting style and rock adjustment
Constants for faulting style adjustment
Required rupture parameters are magnitude and rake