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Digitale Medien

Gravity and elevation changes at Askja, Iceland (1993)

Rymer, Hazel ; Tryggvason, Eysteinn

Springer

Bulletin of volcanology 55 (1993), S. 362-371

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Details

ISSN: 1432-0819

Schlagwort(e): Microgravity ; Ground deformation ; Tilt ; Magma injection ; Caldera unrest

Quelle: Springer Online Journal Archives 1860-2000

Thema: Geologie und Paläontologie

Notizen: Abstract Ground tilt measurements demonstrate that Askja is in a state of unrest, and that in the period 1988–1991 a maximum 48±3 μrad tilt occurred down towards the centre of the caldera. This is consistent with 126 mm of deflation at the centre of the caldera with a 2.5–3.0 km depth to the source of deformation. The volume of the subsidence bowl is 6.2x106 m3. When combined with high precision microgravity measurements, the overall change in sub-surface mass may be quantified. After correction for the observed elevation change using the free air gradient of gravity measured for each station, the total decrease in mass is estimated to be less than 109 kg. A small residual ground inflation and net gravity increase in the southeastern part of the caldera may be caused by dyke intrusion in this region. The minimum dimensions of such an intrusion or complex of intrusions are 1 m width, up to 100 m deep and up to several hundred metres thick.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00301147

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Digitale Medien

Mechanisms of magma eruption and emplacement at Mt Etna between 1989 and 1992 (1993)

Rymer, Hazel ; Murray, John B. ; Brown, Geoff C. ; [weitere]

[s.l.] : Nature Publishing Group

Nature 361 (1993), S. 439-441

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ISSN: 1476-4687

Quelle: Nature Archives 1869 - 2009

Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik

Notizen: [Auszug] At a late stage during the explosive activity from the southeast crater (10 September-6 October 1989), two prominent fissures developed, one erupting to the northeast2 and the second, a non-erupting fissure, extending 7 km towards the south-southeast. Seismic3'4, soil gas emanations5, thermal ...