NOTES:

We give two possible explanations for the variability in the stress orientations.
A spatial explanation for the variability is inhomogeneous stress along the fault. This may be a result of the irregular shape of the fault.
A temporal explanation for the variability is involves translation along the San Andreas fault. Assuming that movement along the "big bend" of the San Andreas is 20mm/year, it would take about 1.72 million years for Quatal Canyon to move from the Garlock fault intersection to its present location. During this movement along the San Andreas, there may have been significant changes in the amount of thrusting component associated with the Quatal fault. A strike-slip component may be introduced as it moves further away from the Garlock intersection. This strike-slip component may become more prominant as the strike along the San Andreas fault becomes closer to the relative plate motion.