Magma compressibility and the missing source for some dike intrusions

  title={Magma compressibility and the missing source for some dike intrusions},
  author={Eleonora Rivalta and Paul Segall},
  journal={Geophysical Research Letters},
Dike intrusions are often accompanied by localized deflation, interpreted as depressurizing magma chambers feeding the dike. In some cases the inferred volume decrease is a factor of 4 or 5 less than the volume increase of the dike. Here we explore whether this discrepancy can be explained by compressibility of the magma combined with the fact that cracks are much more compliant than equidimensional magma chambers. If pressure changes are small, the magma compressibility βm is constant, and the… 

Evidence that coupling to magma chambers controls the volume history and velocity of laterally propagating intrusions

[1] In this paper, I present a simple analytical solution for the unsolved problem of a propagating dike coupled to a magma chamber. As recognized by Segall et al. (2001), the flow of the magma from

The propagation of a dyke driven by gas-saturated magma

SUMMARY A new mathematical and numerical model is presented for the propagation of a pressure- and buoyancy-driven dyke filled with volatile-saturated magma and a gas cap at its upper part. The model

Multidisciplinary Constraints on Magma Compressibility, the Pre‐Eruptive Exsolved Volatile Fraction, and the H2O/CO2 Molar Ratio for the 2006 Augustine Eruption, Alaska

Geodetically modeled reservoir volume changes during volcanic eruptions are commonly much smaller than the observed eruptive volumes. This discrepancy is thought to be partially due to the

Contrasting Volcanic Deformation in Arc and Ocean Island Settings Due To Exsolution of Magmatic Water

Two of the most widely observed co‐eruptive volcanic phenomena—Ground deformation and volcanic outgassing—Are fundamentally linked via the mechanism of magma degassing and the development of

Numerical evidences enabling to reconcile gravity and height changes in volcanic areas

S U M M A R Y Gravity and height changes, reflecting magma accumulation in subsurface chambers, are evaluated using finite element models in order to resolve controversial relationships observed in

Magma chambers: what we can, and cannot, learn from volcano geodesy

  • P. Segall
  • Geology
    Philosophical Transactions of the Royal Society A
  • 2019
Numerical calculations confirm that the response to a nearly instantaneous pressure drop during an explosive eruption can be non-monotonic as the rock around the chamber relaxes at different rates, behaviour that has been observed in some magmatic systems.

Physics‐based models of ground deformation and extrusion rate at effusively erupting volcanoes

[1] We present a model of effusive silicic volcanic eruptions which relates magma chamber and conduit physics to time-dependent data sets, including ground deformation and extrusion rate. The model

Comparison of dike intrusions in an incipient seafloor‐spreading segment in Afar, Ethiopia: Seismicity perspectives

[1] Oceanic crust is accreted through the emplacement of dikes at spreading ridges, but the role of dike intrusion in plate boundary deformation during continental rupture remains poorly understood.



Dynamics of magma storage in the summit reservoir of Kilauea Volcano, Hawaii

An eruption of Kilauea Volcano, Hawaii, normally results in a decrease in the internal pressure of a summit magma reservoir as it partly drains. The interior of the volcano responses to the decrease

Volume of magma accumulation or withdrawal estimated from surface uplift or subsidence, with application to the 1960 collapse of Kilauea volcano

An elastic point source model proposed by Mogi for magma chamber inflation and deflation has been applied to geodetic data collected at many volcanoes. The volume of ground surface uplift or

The role of volatiles in magma chamber dynamics

It is shown that the eruption duration and volume of erupted magma may increase by up to two orders of magnitude if the stored internal energy associated with dissolved volatiles can be released into the magma chamber.

Constraints on the Size, Overpressure, and Volatile Content of the Mount St. Helens Magma System from Geodetic and Dome-Growth Measurements During the 2004-2006+ Eruption

During the ongoing eruption at Mount St. Helens, Washington, lava has extruded continuously at a rate that decreased from ~7-9 m 3 /s in October 2004 to 1-2 m 3 /s by December 2005. The volume loss

Exsolution of H2O, CO2, and S during eruptive episodes at Kilauea Volcano, Hawaii

A model for the exsolution of H2O, CO2, and S from Kilauea magma as it rises from a shallow crustal reservoir predicts that vigorous exsolution occurs only after magma has ascended to shallow depths

Comment on " Volume of magma accumulation or withdrawal estimated from surface uplift or subsidence, with application to the 1960 collapse of Kīlauea volcano" by P. T. Delaney and D. F. McTigue

Abstract In volcanoes that store a significant quantity of magma within a subsurface summit reservoir, such as Kīlauea, bulk compression of stored magma is an important mode of deformation.

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Approximate solutions are obtained for the stress and displacement fields due to a pressurized spherical cavity in an elastic half-space. The solutions take the form of series expansions in powers of

On tensile cracks close to and across the interface between two welded elastic half-spaces

Summary Tensile cracks are often employed to model magma migration in rift zones or within volcanic edifices through lateral or feeding dykes. In a crack model, the overpressure of magma with