Source Quantification of Volcanic-Seismic Signals
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- Autoregressive equation
A difference form of the equation of motion of a linear dynamic system, which is a basic equation to determine the complex frequencies (frequencies and Q factors) of decaying harmonic oscillations in observed signals.
- Crack wave
A dispersive wave generated by fluid-solid interactions in a crack. The phase velocity of the crack wave is smaller than the acoustic velocity of the fluid in the crack.
- Moment tensor
A point seismic source representation defined by the first-order moment of the equivalent body force or the stress glut. Slip on a fault as well as volumetric changes such as an isotropic expansion and tensile crack can be represented by the moment tensor.
- Waveform inversion
An approach to estimate source mechanisms and locations of seismic events by finding the best fits between observed and synthesized seismograms.
Definition of the Subject
Volcano seismicity produces a wide variety of seismic signals that provide glimpses of the internal...
I am deeply grateful to Masaru Nakano for numerous discussions on all the subjects presented in this manuscript. I thank Yasuko Takei for constructive comments on the phenomenological source representation. Comments from Pablo Palacios, Luca D’Auria, Takeshi Nishimura, Yuta Maeda, and an anonymous reviewer helped improve the manuscript. I used the Generic Mapping Tools (GMT) (Wessel and Smith 1998) in the preparation of figures.
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