Journal ArticleDOI
Temporal gravity variations at Pacaya volcano, Guatemala
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In this article, the authors show that gravity monitoring may be a practical method of measuring elevation changes preceding eruptions of topographically rugged volcanoes, using finite element modeling, indicates elevation changes of up to +4 m during inflation could cause the gravity changes.About:
This article is published in Journal of Volcanology and Geothermal Research.The article was published on 1979-11-01. It has received 14 citations till now. The article focuses on the topics: Gravity anomaly & Gravity (chemistry).read more
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Journal ArticleDOI
Gravity fields and the interpretation of volcanic structures: Geological discrimination and temporal evolution
Hazel Rymer,G. C. Brown +1 more
TL;DR: A review of gravity data reflecting shallow concealed structures on volcanoes demonstrates that valuable information may be derived on the geological development of such structures and on the dynamic evolution of active volcanoes as mentioned in this paper.
Journal ArticleDOI
The added value of time-variable microgravimetry to the understanding of how volcanoes work
TL;DR: Time-variable volcano gravimetry has shown great potential for imaging subsurface processes at active volcanoes, especially when combined with other methods (e.g., ground deformation, seismicity, and gas emissions) as discussed by the authors.
Journal ArticleDOI
Deformation, gravity, and potential changes due to volcanic loading of the crust
TL;DR: In this article, a method for calculating deformation, gravity and potential changes induced by volcanic loads imposed within and on the earth's crust is presented, which involves application of techniques developed for earthquake loading problems in elastic-gravitational earth models.
Journal ArticleDOI
Detecting volcanic eruption precursors: a new method using gravity and deformation measurements
Glyn Williams-Jones,Hazel Rymer +1 more
TL;DR: In this paper, the authors show how the simultaneous measurement of deformation and gravity at only a few key stations can identify important precursory processes within a magma reservoir prior to the onset of more conventional eruption precursors.
Journal ArticleDOI
Residual gravity changes and eruption magnitudes
TL;DR: In this article, the authors show that residual gravity changes are caused by the free-air effect of elevation changes induced by magma bodies and by mass redistributions, and that the only reasonable mechanism for these negative pre-eruption mass redistribution is displacing dense country rock or magma with gas bubbles in vesiculated magma.
References
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Journal ArticleDOI
Finite element modeling of surface deformation associated with volcanism
TL;DR: In this paper, the surface deformation of the lower east rift zone of Kilauea appears best explained as being produced by increased magma pressure in a 45° south-dipping dike whose top is about 1 km below the surface.
Journal ArticleDOI
Surface deformation associated with volcanism
J. B. Walsh,R. W. Decker +1 more
TL;DR: In this article, a line source of dilatation in a half-space is considered, and it is shown that surface displacements are not sensitive to small changes in the angle of dip.
Book ChapterDOI
Chapter 4 - The Measurement of Crustal Deformation Related to Volcanic Activity at Kilauea Volcano, Hawaii
Journal ArticleDOI
State-of-the-art in volcano forecasting
TL;DR: In this article, the authors argue that no single predictive index appears to be the master key to volcanic forecasting, since individual volcanoes are unique variations of the general processes of volcanism, and the case history of one volcano cannot always be used to diagnose the symptoms of another.
Journal ArticleDOI
Gravity effects of volcanic islands
TL;DR: Gravitational surveys of six volcanic islands in the Southern Cook Group (South-West Pacific Ocean) show that the radial anomaly gradient near the reef is much larger than the calculated effect for an island of uniform density.