Volcano Seismology,
Kawakatsu, H., and M. Yamamoto,
in ``Earthquake Seismology"
edited by H. Kanamori, Treatise of Geophysics, Elsevier, accepted, 2006.
Introduction
Volcano seismology is a field of volcanology in which seismological
techniques are employed to help understanding the physical conditions
and dynamic states of volcanic edifices and volcanic fluid systems to
a level eventually contributes to predictions of initiation
and cessation of hazardous volcanic activities.
Seismology has been a powerful tool for this purpose,
especially in the past 10-15 years as new observational
and analysis techniques in seismology has become available
\citep[\eg][]{Chouet1996a,Chouet1996b,McNutt2005};
those include digital and broadband seismometry, and array and
moment tensor waveform analyses.
While the subjects that should be covered under the
title of volcano seismology
are quite broad and diverse,
this chapter, however,
neither intends to nor is capable to cover all of its areas;
instead we try to focus on some of seismological phenomena
which appear to be specific to volcanos.
In a sense, volcano seismology here is a field of seismology
which deals with problems specific to volcanic areas.
Some of the subjects, such as seismic structure of
volcanoes (tomography) and eruption monitoring (seismicity), etc,
are therefore intentionally omitted.
Those readers who are interested in these
subjects are advised to refer to the excellent reviews by
\citet{Chouet1996a,Chouet1996b,Chouet2003} and \citet{McNutt1996,McNutt2002,McNutt2005}.