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Volcano deformation...
Volcano deformation at active plate boundaries : Deep magma accumulation at Hekla volcano and plate boundary deformation in south Iceland
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- Geirsson, Halldor (author)
- PennState University, USA
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- LaFemina, Peter (author)
- PennState University, USA
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- Arnadottir, Thora (author)
- University of Iceland
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- Sturkell, Erik, 1962 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för geovetenskaper,Department of Earth Sciences
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- Sigmundsson, Freysteinn (author)
- University of Iceland
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Travis, Matthew (author)
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- Schmidt, Peter (author)
- Uppsala universitet,Geofysik
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- Lund, Björn (author)
- Uppsala universitet,Geofysik,Seismology
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- Hreinsdottir, Sigrun (author)
- University of Iceland
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- Bennett, Rick (author)
- University of Arizona
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Arnadottir, Th. (author)
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- Travis, Mark (author)
- PennState University, USA
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(creator_code:org_t)
- 2012
- 2012
- English.
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In: Journal of Geophysical Research. - 0148-0227 .- 2156-2202. ; 117:B11409
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://gup.ub.gu.se...
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Abstract
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- Most magmatic systems on Earth are located at actively deforming plate boundaries. In these systems, the magmatic and plate boundary deformation signals are intertwined and must be deconvolved to properly estimate magma flux and source characteristics of the magma plumbing system. We investigate the inter-rifting and inter-seismic deformation signals at the Eastern Volcanic Zone (EVZ) - South Iceland Seismic Zone (SISZ) ridge - transform intersection and estimate the location, depth, and volume rate for magmatic sources at Hekla and Torfajokull volcanoes, which are located at the intersection. We solve simultaneously for the source parameters of the tectonic and volcanic deformation signals using a new ten-year velocity field derived from a dense network of episodic and continuous GPS stations in south Iceland. We find the intersection of the axes of the EVZ and the SISZ is located within the Torfajokull caldera, which itself is subsiding. Deformation at Hekla is statistically best described in terms of a horizontal ellipsoidal magma chamber at 24(2)(+4) km depth aligned with the volcanic system and increasing in volume by 0.017(-0.002)(+0.007) km(3) per year. A spherical magma chamber centered at 24(-2)(+5) km depth with a volume rate of 0.019(-0.002)(+0.011) km(3) per year, or a vertical pipe-shaped magma chamber between 10(-1)(+3) km and 21(-4)(+7) km with a volume rate of 0.008(-0.001)(+0.003) km(3) per year are also plausible models explaining the deformation at Hekla. All three models indicate magma accumulation in the lower crust or near the Moho under Hekla.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geofysik (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geophysics (hsv//eng)
Keyword
- Geophysics with specialization in Seismology
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Geirsson, Halldo ...
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LaFemina, Peter
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Arnadottir, Thor ...
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Sturkell, Erik, ...
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Sigmundsson, Fre ...
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Travis, Matthew
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show more...
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Schmidt, Peter
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Lund, Björn
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Hreinsdottir, Si ...
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Bennett, Rick
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Arnadottir, Th.
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Travis, Mark
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Geophysics
- Articles in the publication
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Journal of Geoph ...
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Journal of Geoph ...
- By the university
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Uppsala University
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University of Gothenburg