Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/1345
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dc.contributor.authorallGómez M., D. M.; INGEOMINAS - Observatorio Vulcanológico y Sismológico Pasto, Colombiaen
dc.contributor.authorallTorres C., R. A.; INGEOMINAS - Observatorio Vulcanológico y Sismológico Pasto, Colombiaen
dc.contributor.authorallSeidl, D.; Seismologisches Zentralobservatorium Gräfenberg, Germanyen
dc.contributor.authorallHellweg, M.; Institut für Geophysik, Universität Stuttgart, Germanyen
dc.contributor.authorallRademacher, H.; Geo Enterprises Orinda, CA, U.S.A.en
dc.date.accessioned2006-07-26T12:35:47Zen
dc.date.available2006-07-26T12:35:47Zen
dc.date.issued1999-06en
dc.identifier.urihttp://hdl.handle.net/2122/1345en
dc.description.abstractLong-duration events have been recorded at several active, andesitic volcanoes. Their main characteristics are a single, sharp frequency peak, and an exceptionally long coda. Because their seismograms resemble a screw, these signals are called "tornillos" in Colombia. These events have been recorded during different stages of volcanic activity at various volcanoes worldwide. Tornillos have occurred for example, as a short-term precursor to eruptions at Galeras volcano, Colombia (1992-1993); and at Asama volcano, Japan, (1983). At Tokachi volcano, Japan, they were recorded after an eruption (1989). The Tornillo's dominant frequency appears to be related to the time of occurrence during an eruption cycle. It is independent of epicentral distance, azimuth, travel time, and lapse time, indicating that it is a source characteristic. Damping coefficients for the tornillo's coda range between 0.002 and 0.02. In contrast, damping coefficients for normal long-period events lies between 0.010 and 0.025 and for volcano-tectonic events between 0.010 and 0.040. In March 1996, the Galeras seismic network, which consists of short period, single-component seismometers, was augmented with a broadband, three-component station. This station, installed 1.5 km south of Galeras active cone, recorded a series of six tornillos. Narrowband and broadband tornillo records have similar characteristics in the time and frequency domains.en
dc.format.extent4127971 bytesen
dc.format.mimetypeapplication/pdfen
dc.language.isoEnglishen
dc.relation.ispartofseries3/42 (1999)en
dc.subjectvolcanoesen
dc.subjectseismic eventsen
dc.subjectbroadband recorden
dc.subjecttornillosen
dc.subjectGaleras volcanoen
dc.titleTornillo seismic events at Galeras volcano, Colombia: a summary and new information from broadband three-component measurementsen
dc.typearticleen
dc.type.QualityControlPeer-revieweden
dc.subject.INGV04. Solid Earth::04.06. Seismology::04.06.08. Volcano seismologyen
dc.description.journalTypeJCR Journalen
dc.description.fulltextopenen
dc.contributor.authorGómez M., D. M.en
dc.contributor.authorTorres C., R. A.en
dc.contributor.authorSeidl, D.en
dc.contributor.authorHellweg, M.en
dc.contributor.authorRademacher, H.en
dc.contributor.departmentINGEOMINAS - Observatorio Vulcanológico y Sismológico Pasto, Colombiaen
dc.contributor.departmentINGEOMINAS - Observatorio Vulcanológico y Sismológico Pasto, Colombiaen
dc.contributor.departmentSeismologisches Zentralobservatorium Gräfenberg, Germanyen
dc.contributor.departmentInstitut für Geophysik, Universität Stuttgart, Germanyen
dc.contributor.departmentGeo Enterprises Orinda, CA, U.S.A.en
item.openairetypearticle-
item.cerifentitytypePublications-
item.languageiso639-1en-
item.grantfulltextopen-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.fulltextWith Fulltext-
crisitem.author.deptINGEOMINAS - Observatorio Vulcanológico y Sismológico Pasto, Colombia-
crisitem.author.deptINGEOMINAS, Observatorio Vulcanológico y Sismológico, Unidad Operativa Pasto, Colombia-
crisitem.author.deptBundesanstalt für Geowissenschaften und Rohstoffe, Seismologisches Zentralobservatorium Gräfenberg, Erlangen, Germany-
crisitem.author.deptUniversity of California, Berkeley Seismological Laboratory, Berkeley, USA-
crisitem.author.dept57 Overhill Rd., Orinda, CA, U.S.A.-
crisitem.classification.parent04. Solid Earth-
Appears in Collections:Annals of Geophysics
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