USGS Volcano Hazards Program
U.S. Geological Survey
U.S. Geological Survey program that monitors US volcanoes through five observatories. Provides live alert levels, a volcano and monitoring map, hazard assessments, eruption histories, and explanations of volcanic hazards such as lahars, ashfall, and gas. Authoritative source for current monitoring practice and hazard forecasting.
More resources on Volcanoes & Earthquakes
Global Volcanism Program
Smithsonian Institution's database of Holocene volcanoes and eruptions worldwide, with eruption histories, Volcanic Explosivity Index data, weekly activity reports with USGS, the Bulletin of the Global Volcanism Network, and a public API. Definitive data source for the famous events and global eruption record.
USGS Earthquake Hazards Program
U.S. Geological Survey hub for earthquake science, offering real-time global earthquake feeds, a searchable earthquake catalog, a significant-earthquakes archive, national seismic hazard models, and educational material on faults, magnitude, and shaking. Learners can work with real data (latest quakes, catalog search) next to official hazard models.
An Introduction to Seismology, Earthquakes, and Earth Structure
Standard university seismology textbook covering elastic wave propagation, body and surface waves, earthquake source mechanics and focal mechanisms, seismic imaging of Earth's interior, and the link between earthquakes and plate tectonics. Assumes calculus and physics.
Earthshaking Science: What We Know (and Don't Know) about Earthquakes
Non-mathematical but serious entry point to seismology. A USGS research seismologist explains earthquake science for general readers: how ruptures start and stop, fault behavior, magnitude and ground shaking, seismic hazard assessment, and why earthquake prediction remains unsolved.
Volcanoes (2nd Edition)
Introductory volcanology textbook covering magma generation, eruption styles, lava flows, pyroclastic deposits, calderas, volcanic gases and climate effects, and volcanic hazards and risk mitigation, illustrated with case studies of major historical eruptions. Practitioner volcanologist Erik Klemetti calls it the best and easiest to read introductory volcanology textbook.