Southern California Earthquake Center pynga: A python package for the Next Generation Attenuation relations Feng Wang Oct. 12 th, 2012 1.

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Southern California Earthquake Center pynga: A python package for the Next Generation Attenuation relations Feng Wang Oct. 12 th,

Southern California Earthquake Center 2 utils.py __init__.py Validation & Application pynga/ AS08.py BA08.py CB08.py CY08.py SC08.py Python Classes Python Package Returning:  Median  Inter-event standard deviation  Intra-event standard deviation  total standard deviation Features: Easy to install and less dependence on other packages Capable to input updated coefficients and keep using the same model functionals Capable of adding new NGA models Build-in utilities to compute unknown parameters, such as Rjb, Rrup, and Rx based on fault geometry Output results can be easily saved as Mat-style for further usages Python utilities Download: The package is version-controlled at GitHub, so you can clone the package using "git clone" git clone Package components

Southern California Earthquake Center 3 Validation of NGA models Compare median and total standard deviation with those calculated using OpenSHA Results are presented in nNGAs RMS is within 0.02% for PGA, PGV, and SA at various periods Differences in scatter are due to the float points in the results, and pynga has longer float points.

Southern California Earthquake Center 4 Distance calculations UCERF-type fault geometry Basic inputs: 1.Surface projection of top rupture edges (single and/or multiple fault traces, long/lat) 2.Average upper seismogenic depth (km) 3.Average lower seismogenic depth (km) 4.Average dip angle (degree) utils.py provides functions to generate fault surface and discretize the surface by specifying down-dip and along-strike grid spaces, and then to compute distance parameters (Rjb, Rrup, Rx) given site location.

Southern California Earthquake Center 5 BBP-type fault geometry For more complicated source descriptions (in *.srf, discretized points are explicitly presented on the fault plane, just like rupture variations used in CyberShake which are similar to *.srf) utils.py provides functions to generate fault surface (different choices) and discretize the surface by specifying down-dip and along-strike grid spaces, and then to compute distance parameters (Rjb, Rrup, Rx) given site location. A simple source description shown in *.src file

Southern California Earthquake Center 6 Examples BBP-type fault geometry A simple source from Fling study

Southern California Earthquake Center 7 Examples

Southern California Earthquake Center 8 Examples

Southern California Earthquake Center 9 Examples

Southern California Earthquake Center 10 Examples SRF-type fault geometry Site locations (black square) and fault surface trace (blue line)

Southern California Earthquake Center 11 Calcluated by OpenSHA Examples SRF-type fault geometry Elysian Park (Upper)

Southern California Earthquake Center 12 SRF-type fault geometry Calcluated by utils.py in pynga Examples

Southern California Earthquake Center 13