Stress hanging node problems were a figment of my imagination...
The problem was that I was using a linear interpolation on the log of
the data and mistakenly assuming that should match the log of the
average at the midpoint of the line.
Some trivial fixes
Playing around with more realistic cases. SOme rate-state friction for
the fault boundary conditions. Also, some evolution including periodic
earthquake events.
Can't seem to ensure that slip is conserved.
Blah