Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/1338
DC Field | Value | Language |
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dc.contributor.authorall | Seidl, D.; Bundesanstalt für Geowissenschaften und Rohstoffe, Seismologisches Zentralobservatorium Gräfenberg, Erlangen, Germany | en |
dc.contributor.authorall | Hellweg, M.; Institut für Geophysik, Universität Stuttgart, Germany | en |
dc.contributor.authorall | Rademacher, H.; Geo Enterprises Orinda, CA, U.S.A | en |
dc.contributor.authorall | Gomez M., D. M.; INGEOMINAS - Observatorio Vulcanológico y Sismológico, Pasto, Colombia | en |
dc.contributor.authorall | Torres C., R. A.; INGEOMINAS - Observatorio Vulcanológico y Sismológico, Pasto, Colombia | en |
dc.date.accessioned | 2006-07-26T12:32:50Z | en |
dc.date.available | 2006-07-26T12:32:50Z | en |
dc.date.issued | 1999-06 | en |
dc.identifier.uri | http://hdl.handle.net/2122/1338 | en |
dc.description.abstract | Many of the recent ash eruptions of Galeras volcano (Colombia) have been preceded by tornillos. These unusual seismic events of unknown origin have screw-like profiles on seismograms and can last up to several minutes. In March, 1996, a broadband, three-component seismometer station was installed 1.6 km south of Cono, Galeras' active vent. With high quality recordings acquired by this system, and methods which work well with narrow band signals, we investigate the frequency content and polarization properties of two tornillos. They have slighty different predominant frequencies, 3.0420 Hz and 3.0595 Hz which remain highly stable for the entire tornillo duration. The polarization analysis shows that the polarization for the two events also differs slightly but remains constant. Most of their energy is linearly polarized and lies in the horizontal plane. If these waves are taken to be SH waves, the remaining energy is confined to the beginning of the tornillo during its initiation or excitation. The remainder of the tornillo is characterized by exponential decay. These observations provide parameters for the classification of tornillos and constraints for source models. | en |
dc.format.extent | 2807037 bytes | en |
dc.format.mimetype | application/pdf | en |
dc.language.iso | English | en |
dc.relation.ispartofseries | 3/42 (1999) | en |
dc.subject | Galeras | en |
dc.subject | tornillo | en |
dc.subject | polarizations | en |
dc.subject | analytic function | en |
dc.subject | parametrization | en |
dc.title | The anatomy of a tornillo: puzzles from three-component measurements at Galeras volcano (Colombia) | en |
dc.type | article | en |
dc.type.QualityControl | Peer-reviewed | en |
dc.subject.INGV | 04. Solid Earth::04.06. Seismology::04.06.08. Volcano seismology | en |
dc.description.journalType | JCR Journal | en |
dc.description.fulltext | open | en |
dc.contributor.author | Seidl, D. | en |
dc.contributor.author | Hellweg, M. | en |
dc.contributor.author | Rademacher, H. | en |
dc.contributor.author | Gomez M., D. M. | en |
dc.contributor.author | Torres C., R. A. | en |
dc.contributor.department | Bundesanstalt für Geowissenschaften und Rohstoffe, Seismologisches Zentralobservatorium Gräfenberg, Erlangen, Germany | en |
dc.contributor.department | Institut für Geophysik, Universität Stuttgart, Germany | en |
dc.contributor.department | Geo Enterprises Orinda, CA, U.S.A | en |
dc.contributor.department | INGEOMINAS - Observatorio Vulcanológico y Sismológico, Pasto, Colombia | en |
dc.contributor.department | INGEOMINAS - Observatorio Vulcanológico y Sismológico, Pasto, Colombia | 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 | Bundesanstalt für Geowissenschaften und Rohstoffe, Seismologisches Zentralobservatorium Gräfenberg, Erlangen, Germany | - |
crisitem.author.dept | University of California, Berkeley Seismological Laboratory, Berkeley, USA | - |
crisitem.author.dept | 57 Overhill Rd., Orinda, CA, U.S.A. | - |
crisitem.author.dept | INGEOMINAS - Observatorio Vulcanológico y Sismológico Pasto, Colombia | - |
crisitem.author.dept | INGEOMINAS, Observatorio Vulcanológico y Sismológico, Unidad Operativa Pasto, Colombia | - |
crisitem.classification.parent | 04. Solid Earth | - |
Appears in Collections: | Annals of Geophysics |
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File | Description | Size | Format | |
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01 seidl.pdf | 2.74 MB | Adobe PDF | View/Open |
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