Encyclopedia of Complexity and Systems Science

Living Edition
| Editors: Robert A. Meyers

Source Quantification of Volcanic-Seismic Signals

Living reference work entry
DOI: https://doi.org/10.1007/978-3-642-27737-5_583-2


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...

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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.

Supplementary material


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Books and Reviews

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Authors and Affiliations

  1. 1.Graduate School of Environmental StudiesNagoya UniversityNagoyaJapan