The University of Iceland
The free online course, provided by the University of Iceland, gives an introduction to volcano monitoring techniques, magma movements and volcano unrest. It presents some aspects of why volcanoes are dangerous and volcanic hazards.
As magma, molten rock inside volcanoes, approaches the surface it releases volcanic gas that finds its way to the surface, and geothermal activity can change. In addition to ground-based techniques, satellite observations are extensively used. The main monitoring techniques for volcanoes are explained in the course, with the aim that students understand both the concept of volcanic unrest and how it can be monitored, how eruptions can be monitored, and signs of volcanic eruptions as seen on instruments.
Understanding the possibilities and limitations of present-day volcano monitoring for detecting magma movements is an important step in understanding volcanoes, evaluating hazards and for giving warnings of impending eruptions. The course provides information on how scientists predict future activity of volcanoes and volcanic eruptions. Monitoring data are interpreted in terms of models of subsurface processes such as magma accumulation during volcano unrest, and magma withdrawal during eruptions. The course gives an introduction to such models, used to infer the volume and location of magma movements in volcano roots, in particular those based on mapping ground deformation.
Volcano monitoring relies on diverse approaches to infer the state of a volcano. Predicting eruptions or forecasting future activity of a volcano is based on monitoring data. If activity level rises above normal the volcano is in a state of unrest. Magma often intrudes in the roots of volcanoes prior to eruptions. This process generates earthquakes as stress level is increased and ground deformation as the volcano expands in response to additional mass in its subsurface. Seismology and geodetic measurements on the surface of the volcano are thus key to monitoring subsurface conditions.
The University of Iceland provides various massive open online courses on their website.
Sign up for the course here.