Composite Seismogenic Sources (CSS): they are
obtained from geological and geophysical data and
characterized by geometric (strike, dip, width,
min/max depth) and kinematic (rake) parameters,
but their sliding surface geometry is more loosely
defined. CSSs can represent large fault zones which
can contain an unspecified number of ISSs. They are
not assumed to be capable of a characteristic
earthquake but their potential can derive from
existing earthquake catalogues or other geological
considerations. A CSS is essentially inferred on the