Аннотация:This chapter contains sections titled: Introduction: Tectonic Stress and Earthquake Faulting Observational Constraints on the Tectonic Stress Tensor The Tectonic Stress Field Near Plate-Bounding Faults Temporal Changes: Stress Drops, Stress Rotations, and Stress Heterogeneity Summary Appendix A: Focal Mechanism Constraints on the Principal Stress Directions