Terminology and Origin of Pseudotachylyte -- Pseudotachylyte-Related Fault Rocks and Conceptual Fault Models -- Tectonic Environment and Structure of Pseudotachylyte Veins -- Pseudotachylyte Matrix -- Microlites -- Fragments Within Pseudotachylyte Veins -- Chemical Composition and Melting Processes of Pseudotachylyte -- Formation of Pseudotachylyte in the Brittle and Plastic Regimes -- Crushing-Origin Pseudotachylyte and Veinlet Cataclastic Rocks -- Landslide-related Pseudotachylyte -- Experimentally Generated Pseudotachylyte. The topics covered in this book encompass the principl results of field investigations, analyses of meso-scale and micro-scale textures and structures, laboratory experiments, chemical analyses, conceptual fault models, as well as the implications of fault related pseudotachylyte an its related fault rocks for our understanding of earthquakes. We hope that this book helps to bridge the gap between seismology and geology and that it encourages further studies of earthquake and seismic faulting processes.