Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/1557
DC Field | Value | Language |
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dc.contributor.authorall | Blanco, I.; Departamento de Volcanología, Museo Nacional de Ciencias Naturales, CSIC, Madrid, Spain | en |
dc.contributor.authorall | Garcìa, A.; Departamento de Volcanología, Museo Nacional de Ciencias Naturales, CSIC, Madrid, Spain | en |
dc.contributor.authorall | Torta, J. M.; Departamento de Volcanología, Museo Nacional de Ciencias Naturales, CSIC, Madrid, Spain | en |
dc.date.accessioned | 2006-09-11T07:53:16Z | en |
dc.date.available | 2006-09-11T07:53:16Z | en |
dc.date.issued | 1997-03 | en |
dc.identifier.uri | http://hdl.handle.net/2122/1557 | en |
dc.description.abstract | A local ground magnetic study of the Furnas caldera (S. Miguel Island, Azores) has provided new insight into the magnetic structure of this volcano. Analysis of the data comprised removal of the IGRF, reduction to the pole, pseudogravity integration and upward continuation. Also, a spectral method was applied to estimate the depth to the magnetic sources, as well as a 2.5D forward modelling technique. Magnetic properties obtained at the laboratory for some representative sample rocks were considered in the modelling process. The most relevant features are the existence of an important negative anomaly inside the caldera and of an intense positive anomaly to the south of the coast. The former points out a decrease in the magnetization of the caldera filling materials with respect to the surrounding rocks, which could be explained as the result of post-eruption processes such as hydrothermal alteration. This is expected as Furnas has an active hydrothermal system probably related with a magmatic reservoir at high temperature. The positive anomaly suggests the existence of a strongly-magnetized body beneath the south coast. | en |
dc.format.extent | 5906188 bytes | en |
dc.format.mimetype | application/pdf | en |
dc.language.iso | English | en |
dc.relation.ispartofseries | 2/40 (1997) | en |
dc.subject | Furnas caldera | en |
dc.subject | magnetic anomalies | en |
dc.subject | hydrothermal alteration | en |
dc.title | Magnetic study of the Furnas caldera (Azores) | en |
dc.type | article | en |
dc.type.QualityControl | Peer-reviewed | en |
dc.subject.INGV | 04. Solid Earth::04.08. Volcanology::04.08.07. Instruments and techniques | en |
dc.description.journalType | JCR Journal | en |
dc.description.fulltext | open | en |
dc.contributor.author | Blanco, I. | en |
dc.contributor.author | Garcìa, A. | en |
dc.contributor.author | Torta, J. M. | en |
dc.contributor.department | Departamento de Volcanología, Museo Nacional de Ciencias Naturales, CSIC, Madrid, Spain | en |
dc.contributor.department | Departamento de Volcanología, Museo Nacional de Ciencias Naturales, CSIC, Madrid, Spain | en |
dc.contributor.department | Departamento de Volcanología, Museo Nacional de Ciencias Naturales, CSIC, Madrid, Spain | en |
item.openairetype | article | - |
item.cerifentitytype | Publications | - |
item.languageiso639-1 | en | - |
item.grantfulltext | open | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | Departamento de Volcanología, Museo Nacional de Ciencias Naturales, CSIC, Madrid, Spain | - |
crisitem.author.dept | Departamento de Volcanología, Museo Nacional de Ciencias Naturales, CSIC, Madrid, Spain. | - |
crisitem.author.dept | Observatori de l’Ebre, CSIC - URL, Horta Alta 38, 43520 Roquetes, Spain | - |
crisitem.classification.parent | 04. Solid Earth | - |
Appears in Collections: | Annals of Geophysics |
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13 blanco.pdf | 5.77 MB | Adobe PDF | View/Open |
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