Definition of the Subject
Magma transport is fundamentally episodic in character asa result of the inherent instability of magmatic systems at all time scales. This episodicity is reflected inseismic activity, which originates in dynamic interactions between gas, liquid and solid along magma transportpaths involving complex geometries. The geometrical complexity plays a central role in controlling flowdisturbances and also providing specific sites where pressure and momentum changes in the fluid are effectivelycoupled to the Earth.
Recent technological developments and improvements in the seismological instrumentation of volcanoes now allow the surface effects of subterraneanvolcanic processes to be imaged in unprecedented detail. Through detailed analyzes of the seismic wavefields radiated by volcanic activity, it has becomepossible for volcano seismologists to make direct measurements of the volcanic conduit response to flow processes, thus opening the way for detailedmodeling of...
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Abbreviations
- Bubbly liquid:
-
Liquid‐gas mixture in which the gas phase is distributed as discrete bubbles dispersed in a continuous liquid phase.
- Choked flow:
-
Flow condition where the transonic flow of a compressible fluid through a constriction becomes choked. As the fluid flows through a narrowing channel, it accelerates at a rate that depends on the ratio of channel inlet pressure to channel outlet pressure. At a critical pressure ratio, which is a function of the fractional change of cross‐sectional area, the speed of the fluid accelerating through the nozzle‐like constriction reaches a maximum value equal to its sound speed. This flow condition is termed choked flow.
- Crack wave:
-
A dispersive wave generated by fluid-solid interaction in a fluid‐filled crack embedded in an elastic solid. The crack-wave speed is always smaller than the acoustic speed of the fluid.
- Diffuse interface:
-
Thin mixing layer constituting the interface between two immiscible fluids. Interface dynamics is governed by molecular forces and is described by the mixing energy of the two fluid components.
- Gas slug:
-
A gas bubble whose diameter is approximately the diameter of the pipe in which the slug is flowing. In a slug ascending a vertical pipe, the nose of the bubble has a characteristic spherical cap and the gas in the rising bubble is separated from the pipe wall by a falling film of liquid.
- Long‐period (LP) event:
-
A seismic event originating under volcanoes with emergent onset of P waves, no distinct S waves, and a harmonic signature with periods in the range 0.2–2 s as compared to a tectonic earthquake of the same magnitude. LP events are attributed to the involvement of fluid such as magma and/or water in the source process (see also VLP event).
- Magma:
-
Molten rock containing variable amounts of dissolved gases (principally water vapor, carbon dioxide, and sulfur dioxide), crystals (principally silicates and oxides), and, occasionally, preexisting solid rock fragments.
- Moment tensor:
-
A symmetric second‐order tensor that completely characterizes an internal seismic point source. For an extended source, it represents a point‐source approximation and can be quantified from an analysis of seismic waves whose wavelengths are much longer than the source dimensions.
- Nonlinear process:
-
Process involving physical variables governed by nonlinear equations that reflect the fundamental micro-scale dynamics of the system. Nonlinear phenomena can arise from a number of different sources, including convective acceleration in fluid dynamics, constitutive relations, boundary conditions representing gas‐liquid interfaces, nonlinear body forces, and geometric nonlinearities arising from large-scale deformation.
- Phase‐field method:
-
Method treating the interface between two immiscible fluids as a diffuse thin layer; also known as the diffuse interface method. In this approach, the physical and chemical properties of the interfacial layer are defined by a phase-field variable ϕ, whose dynamics are expressed by the Cahn–Hilliard convection‐diffusion equation. Use of the phase-field variable avoids the necessity of tracking the interface and yields the correct interfacial tension from the free energy stored in the mixing layer.
- Very‐long‐period (VLP) event:
-
A seismic event originating under volcanoes with typical periods in the range 2–100 s. VLP events are attributed to the involvement of fluid such as magma and/or water in the source process. Together with LP events, VLP events represent a continuum of fluid oscillations, including acoustic and inertial effects resulting from perturbations in the flow of fluid through conduits.
- Volatile:
-
A chemical compound that is dissolved in magma at high pressure and exsolves from the melt and appears as a low‐density gas at low pressure. The most common volatiles in magma are water, carbon dioxide, and sulfur dioxide.
- Waveform inversion:
-
Given an assumed model of the wave‐propagation medium, a procedure for determining the source mechanism and source location of a seismic event based on matching observed waveforms with synthetics calculated with the model.
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Acknowledgment
I am grateful to Phil Dawson for his assistance in drafting figures. I am indebted to RobertTilling and David Hill for careful reviews and helpful suggestions.
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Chouet, B. (2009). Volcanoes, Non-linear Processes in. In: Meyers, R. (eds) Encyclopedia of Complexity and Systems Science. Springer, New York, NY. https://doi.org/10.1007/978-0-387-30440-3_582
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