Initial implementation of Chiou & Youngs (2014) GMPE  

Implements GMPE of Chiou and Youngs (2014) for active shallow California like region. This version is the GMPE without directivity. 

Test are running here: https://ci.openquake.org/job/zdevel_oq-hazardlib/113/

There is also the syntax reversed(lst) that some may find more readable. You can avoid the zip and just write

all_lons = numpy.array(lons + list(reversed(t_lon)), float)

same for lats and depths