The topics included in this issue deal with many aspects of volcanic and
seismic activity, two of the natural hazards of geological origin that
have the greatest impact and pose the predominant risk to society. This
book comprises eighteen papers, most of which were presented at an
international seminar organized and held at the Complutense University
of Madrid in October 2001. The papers address geodetic, geophysical and
geochemical effects caused by seismic and volcanic activity; monitoring
of volcanic and seismic processes using space and terrestrial
techniques; complementarity of these techniques; theoretical modelling
of volcanic and seismic processes; inverse problem; interpretation of
observations; hazards; seismicity patterns and application.