In this course, you will examine how earthquake science is used to understand rates, probabilities, forecasting, hazard, and risk. It explores how geoscientists evaluate earthquake frequency, calculate probability, and assess seismic risks along active plate boundaries. You will examine statistical distributions and rate calculations to estimate earthquake recurrence intervals and probabilistic hazard levels. The course focuses on the San Andreas Fault system as a primary case study, analyzing its historical rupture segments, surface expressions, and geological history to interpret fault behavior over time. By the end of this course, you will be able to calculate earthquake probabilities and interpret geological and graphical data to evaluate seismic hazards along active fault zones.