An Introduction to Seismology, Earthquakes and Earth Structures, 2nd Edition introduces seismology and its multiple roles in the earth sciences to advanced undergraduate and beginning graduate students.The fundamentals of seismic wave propagation are developed using a physical approach and then applied to show how refraction, reflection, and teleseismic techniques are used to study the structure and thus the composition and evolution of the earth, e.g. for the study of earthquakes and plate tectonics. The new edition features a new set of examples that highlight recent earthquakes, tsunamis and other seismic events, discusses human-induced earthquakes caused by fracking, seismology of the deep Earth, as well as advances in recording and data analysis. Necessary mathematical tools including vector and tensor analysis, matrix algebra, Fourier analysis, statistics of errors, signal processing, and data inversion are introduced with many relevant examples.An Introduction to Seismology, Earthquakes, and Earth Structure gives an excellent overview for students of geophysics and tectonics, and provides a strong foundation for further studies in seismology.