DOI: 10.1144/gsl.mem.2002.021.01.29. A model of the seismic wavefield in gas-charged magma: application to Soufrière Hills Volcano, Montserrat

A model of the seismic wavefield in gas-charged magma: application to Soufrière Hills Volcano, Montserrat

10.1144/gsl.mem.2002.021.01.29

Crossref journal-article

Geological Society of London

Geological Society, London, Memoirs (1881)

Abstract

Abstract Abstract: A stationary two-phase magma model is used to derive the relationship between gas mass and volume fractions, gas and magma bulk densities, temperature and pressure as a function of depth. In turn, these parameters are used to obtain the vertical seismic velocity profile in the gas-charged magma. A two-dimensional finite-difference model of a magma-filled conduit embedded in an elastic medium is then employed to generate the seismic wavefield in and around the conduit. The high impedance contrast between gas-rich magma and surrounding rock results in the seismic energy being efficiently trapped in the conduit; this leads to the generation of a long-lived resonance of tens of seconds commonly observed as low-frequency earthquakes and harmonic tremor. During a single seismic event, a variety of different seismic radiation patterns along the conduit is observed, leading to the occurrence of several distinct seismic phases in the synthetic seismograms. Observations from several volcanoes show peaked amplitude spectra with integer harmonic overtones that exhibit a time-dependent gliding. These features are successfully modelled by varying the excess pressure and, consequently, the gas volume fraction and the seismic velocity, representing sudden degassing events, such as the reduction of pressure by ash-venting, a dome collapse or a Vulcanian explosion, or, in turn, the pressurization of the conduit prior to such events.

Bibliography

Neuberg, J., & OâGorman, C. (2002). A model of the seismic wavefield in gas-charged magma: application to SoufriÃ¨re Hills Volcano, Montserrat. Geological Society, London, Memoirs, 21(1), 603â609.

Authors 2

J. Neuberg (first)
C. O'Gorman (additional)

References 26 Referenced 21

10.1029/98GL00858
Baptie B., Luckett R., Neuberg J. , Druitt T. H., Kokelaar B. P. Observations of low-frequency earthquakes and volcanic tremor at Soufrière Hills Volcano, Montserrat The Eruption of Soufrière Hills Volcano, Montserrat, from 1995 to 1999 2002 21 611 620 Geological Society, London, Memoirs / The Eruption of Soufrière Hills Volcano, Montserrat, from 1995 to 1999 / Geological Society, London, Memoirs by Baptie B. (2002)
10.1029/97GL00179
10.1190/1.1441945
10.1029/JB093iB05p04375
10.1038/380309a0
10.1016/0377-0273(94)90030-2
10.1029/98GL01330
10.1029/JB092iB09p09215
10.1016/0377-0273(92)90122-T
10.1016/0377-0273(94)90031-0
Leighton T. G. The Acoustic Bubble 1994 London Academic Press / The Acoustic Bubble by Leighton T. G. (1994)
10.1190/1.1442422
Luckett R., Baptie B., Neuberg J. , Druitt T. H., Kokelaar B. P. The relationship between degassing and rockfall signals at Soufrière Hills Volcano, Montserrat The Eruption of Soufrière Hills Volcano, Montserrat, from 1995 to 1999 2002 21 595 602 Geological Society, London, Memoirs / The Eruption of Soufrière Hills Volcano, Montserrat, from 1995 to 1999 / Geological Society, London, Memoirs by Luckett R. (2002)
10.1029/98GL01778
10.1098/rsta.2000.0602
10.1029/98GL01441
10.1016/S0377-0273(00)00169-4
10.1029/95GL01433
10.1007/BF02598188
Shaw H. R. , Hoffman A. W. , et al. Diffusion of H20 in granitic liquids: Part I, Experimental data; Part II, Mass tarnsfer in magma chambers Geochemical Transport and Kinetics 1974 634 Washington Carnegie Institute 139 170 / Geochemical Transport and Kinetics by Shaw H. R. (1974)
10.1029/98GL00639
Spera F. J. , Sigurdsson H., Houghton B., McNutt S. R., Rymer H., Stix J. Physical properties of magma Encyclopedia of Volcanoes 2000 London Academic Press 171 190 / Encyclopedia of Volcanoes by Spera F. J. (2000)
10.1029/98GL01160
10.1029/98GL02427
Wood A. B. A Textbook of Sound 1932 London Bell 360 364 / A Textbook of Sound by Wood A. B. (1932)

Dates

Type	When
Created	18 years ago (Aug. 3, 2007, 5:27 p.m.)
Deposited	1 year, 1 month ago (July 23, 2024, 8:07 a.m.)
Indexed	6 days, 1 hour ago (Aug. 21, 2025, 1:15 p.m.)
Issued	23 years, 7 months ago (Jan. 1, 2002)
Published	23 years, 7 months ago (Jan. 1, 2002)
Published Online	22 years, 9 months ago (Nov. 25, 2002)
Published Print	23 years, 7 months ago (Jan. 1, 2002)

Funders 0

None

BibTeX

@article{Neuberg_2002, title={A model of the seismic wavefield in gas-charged magma: application to Soufrière Hills Volcano, Montserrat}, volume={21}, ISSN={2041-4722}, url={http://dx.doi.org/10.1144/gsl.mem.2002.021.01.29}, DOI={10.1144/gsl.mem.2002.021.01.29}, number={1}, journal={Geological Society, London, Memoirs}, publisher={Geological Society of London}, author={Neuberg, J. and O’Gorman, C.}, year={2002}, month=jan, pages={603–609} }

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