Principal rupture traces

Shapefiles for the principal rupture traces for the Landers, Hector Mine, El Mayor Cucapah, and Ridgecrest (foreshock and mainshock) earthquakes. The principal rupture trace for each event (i.e. the fault with respect to which fault-perpendicular distance is measured) is simplified from the ruptures mapped as primary in each of the rupture maps in the FDHI rupture database, with the exception of the Ridgecrest mainshock where a second fault in the middle of the dry lake bed was added based on the mapping of Rodriguez Padilla et al. (2022).