Rupture Surface

In OpenSHA, a Rupture Surface is the surface that slips during an earthquake (see Earthquake Rupture). It may be represented in a variety of ways:

  • Point Surface – Used to represent point-source earthquakes.
  • Gridded Surface – Used to represent entire faults (e.g. the uniformely gridded Frankel Fault Surface, Stirling Fault Surface, and Listric Surface. We also have an Approximately Gridded Surface that is used for subduction zones).
  • Subset Surface – Used to represent subsets of entire Gridded Surfaces (see figure to right) when modelling earthquakes of different sizes on an individual fault.

A Fault Surface is further defined by a:

Rupture Top Depth

The depth (in km) to the shallowest point on an earthquake Rupture Surface.

Down Dip Width

The average width of an Rupture Surface measured in the down-dip direction.