Introduction -- Atmospheric Changes and Observations -- Atmospheric Changes and Observations -- GNSS Ionospheric Sounding -- Detection methods for ionospheric disturbances -- Seismic lower-atmospheric anomalies -- Pre-seismic Ionospheric Anomalies -- Co-/Post-seismic Ionospheric Disturbances -- Two-mode seismo-ionospheric disturbances -- Seismo-ionospheric Rayleigh waves -- Epicenter from Ionospheric Disturbances -- Tsunami Ionospheric Disturbances -- Volcano Atmospheric Disturbances -- Volcanic Plumes Detection from GNSS SNR -- Summary and Prospective -- Index.GNSS can detect the seismic atmospheric-ionospheric variations, which can be used to investigate the seismo-atmospheric disturbance characteristics and provide insights on the earthquake. This book presents the theory, methods, results, and modeling of GNSS atmospheric seismology. Sesimo-tropospheric anomalies, Pre-/Co-/Post-seismic ionospheric disturbances, epicenter estimation, tsunami and volcano ionospheric disturbances, and volcanic plumes detection with GNSS will be presented and discussed per chapter in the book. .