The geometry of a Simple Fault, the most common fault type used in OpenSHA, is described by the fault's Trace, Average Dip and Upper and Lower Seismogenic Depths. This is the minimum information required to define surfaces on which slip associated with earthquakes occurs.
A line marking the intersection of a fault (rupture) surface with the surface of the earth. In OpenSHA a Fault Trace is represented with a list of locations (latitude, longitude, depth).
The average dip (angle between the earth's surface and fault plane) along the length of the fault.
The depth (in km) of the lower limit of seismogenic rupture. This depth is generally based on the maximum depths of microsesmicity in a given region.
The depth (in km) of the upper limit of seismogenic rupture. This depth is generally applied regionally to reduce near surface seismic energy (moment) release in hazard models (to match observations).