Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/1328
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dc.contributor.authorallMusumeci, C.; Dipartimento di Scienze Geologiche, Università di Catania, Italyen
dc.contributor.authorallMalone, S. D.; University of Washington, Geophysics Program, Seattle, WA, U.S.A.en
dc.contributor.authorallGiampiccolo, E.; Dipartimento di Scienze Geologiche, Università di Catania, Italyen
dc.contributor.authorallGresta, S.; Dipartimento di Scienze Geologiche, Università di Catania, Italyen
dc.date.accessioned2006-07-05T08:20:57Zen
dc.date.available2006-07-05T08:20:57Zen
dc.date.issued2000-10en
dc.identifier.urihttp://hdl.handle.net/2122/1328en
dc.description.abstractFault plane solutions of 459 events occurring between 1995 and 1998 at Mount St. Helens (State of Washington, Northwest U.S.A.) were considered in order to infer the state of stress beneath the volcano. These events occurred in two distinct depth zones. The shallower zone is between 2 and 5.5 km, with shocks clustering in a tight cylindrical distribution about 1 km in radius directly beneath the crater. The deeper events are spread over a larger volume from 5.5 to 10 km depth and surround an aseismic zone below and slightly west of the lava dome. Faulting is characterized by a mixture of strike-slip, reverse and normal faults with maximum compression axes which do not cluster around a single direction. In the deep zone, between 5.5 and 10 km, P axes define a wheel-spoke pattern pointing radially away from the center of the aseismic zone. The 459 fault plane solutions were inverted for stress tensor parameters using the algorithm of Gephart and Forsyth. The inversion of the whole data set revealed that faulting was not produced by a uniform stress distribution. The subdivision of the zone into smaller volumes significantly reduced misfit and confidence areas of the solutions, whereas temporal subdivision of the sample did not lead to significant improvements in terms of stress uniformity. We suggest that the inhomogeneous stress field is consistent with a varying pressure source originating from the inferred crustal magma chamber and a thin conduit extending above it.en
dc.format.extent6578807 bytesen
dc.format.mimetypeapplication/pdfen
dc.language.isoEnglishen
dc.relation.ispartofseries5/43 (2000)en
dc.subjectMount St. Helens (USA)en
dc.subjectfault-plane solutionsen
dc.subjectinversionen
dc.subjectstress fielden
dc.titleStress tensor computations at Mount St. Helens (1995-1998)en
dc.typearticleen
dc.type.QualityControlPeer-revieweden
dc.subject.INGV04. Solid Earth::04.06. Seismology::04.06.08. Volcano seismologyen
dc.subject.INGV04. Solid Earth::04.07. Tectonophysics::04.07.05. Stressen
dc.subject.INGV04. Solid Earth::04.08. Volcanology::04.08.99. General or miscellaneousen
dc.description.journalTypeJCR Journalen
dc.description.fulltextopenen
dc.contributor.authorMusumeci, C.en
dc.contributor.authorMalone, S. D.en
dc.contributor.authorGiampiccolo, E.en
dc.contributor.authorGresta, S.en
dc.contributor.departmentDipartimento di Scienze Geologiche, Università di Catania, Italyen
dc.contributor.departmentUniversity of Washington, Geophysics Program, Seattle, WA, U.S.A.en
dc.contributor.departmentDipartimento di Scienze Geologiche, Università di Catania, Italyen
dc.contributor.departmentDipartimento di Scienze Geologiche, Università di Catania, Italyen
item.openairetypearticle-
item.cerifentitytypePublications-
item.languageiso639-1en-
item.grantfulltextopen-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.fulltextWith Fulltext-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione OE, Catania, Italia-
crisitem.author.deptDepartment of Earth and Space Sciences, University of Washington Seattle, Washington, USA.-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione OE, Catania, Italia-
crisitem.author.deptUniversità di Catania-
crisitem.author.orcid0000-0002-0143-4594-
crisitem.author.orcid0000-0001-5203-7436-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.classification.parent04. Solid Earth-
crisitem.classification.parent04. Solid Earth-
crisitem.classification.parent04. Solid Earth-
Appears in Collections:Annals of Geophysics
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