Evidence of multiple strain fields beneath the eastern flank of Mt. Etna volcano (Sicily, Italy) deduced from seismic and geodetic data during 2003-2004.
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| Title: | Evidence of multiple strain fields beneath the eastern flank of Mt. Etna volcano (Sicily, Italy) deduced from seismic and geodetic data during 2003-2004. |
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| Authors: | Alparone, Salvatore1, Barberi, Graziella1, Bonforte, Alessandro1, Maiolino, Vincenza1, Ursino, Andrea1 andrea.ursino@ct.ingv.it |
| Source: | Bulletin of Volcanology. Sep2011, Vol. 73 Issue 7, p869-885. 17p. |
| Subject Terms: | *Volcanoes, *Seismology |
| Geographic Terms: | Mount Etna (Italy), Sicily (Italy), Italy |
| Abstract: | We carried out a study of the seismicity and ground deformation occurring on Mt. Etna volcano after the end of the 2002-2003 eruption and before the onset of the 2004-2005 eruption. Data were recorded by the permanent local seismic network run by Istituto Nazionale di Geofisica e Vulcanologia - Sezione di Catania and by geodetic surveys carried out in July 2003 and July 2004 on the GPS network. Most earthquakes were grouped in two main clusters located in the northeastern and southeastern sectors of the volcano. The areal distribution of seismic energy associated with the recorded earthquakes allowed us to highlight the main seismogenic areas of Mt. Etna. In order to better understand the kinematic processes of the volcano, 3D seismic locations were used to compute fault plane solutions, and a selected dataset was inverted to determine stress and strain tensors. The focal mechanisms in the northeastern sector show clear left-lateral kinematics along an E-W fault plane, consistent with events occurring along the Pernicana Fault system. The fault plane solutions in the southeastern sector show mainly right-lateral kinematics along a NNE and ENE fault plane and left lateral-kinematics along NW fault planes that together suggest roughly E-W oriented compression. Surface ground deformation affecting Mt. Etna measured by GPS surveys highlighted a marked inflation during the same period and exceptionally strong seawards motion of its eastern flank. The 2D geodetic strain tensor distribution was calculated and the results show mainly ENE-WSW extension coupled with WNW-ESE contraction, indicating right-lateral shear along a NW-SE oriented fault plane. The different deformation of the eastern sector of the volcano, as measured by seismicity and ground deformation, must be interpreted by considering the different depths of the two signals. Seismic activity in the southeastern sector of volcano is located between 3 and 8 km b.s.l. and can be associated with a very strong additional E-W compression induced by a pressurizing source just westwards and at the same depth, located by inverting GPS data. Ground deformation, in contrast, is mainly affected by the shallower dynamics of the fast moving eastern flank which produces a shallower opposing E-W extension. The entire dataset shows that two different processes affect the eastern flank at the same time but at different depths; the boundary is clearly located at a depth of 3 km b.s.l. and could represent the décollement surface for the mobile flank. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
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| Header | DbId: enr DbLabel: Energy & Power Source An: 64894468 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Evidence of multiple strain fields beneath the eastern flank of Mt. Etna volcano (Sicily, Italy) deduced from seismic and geodetic data during 2003-2004. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Alparone%2C+Salvatore%22">Alparone, Salvatore</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Barberi%2C+Graziella%22">Barberi, Graziella</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Bonforte%2C+Alessandro%22">Bonforte, Alessandro</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Maiolino%2C+Vincenza%22">Maiolino, Vincenza</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Ursino%2C+Andrea%22">Ursino, Andrea</searchLink><relatesTo>1</relatesTo><i> andrea.ursino@ct.ingv.it</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Bulletin+of+Volcanology%22">Bulletin of Volcanology</searchLink>. Sep2011, Vol. 73 Issue 7, p869-885. 17p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22Volcanoes%22">Volcanoes</searchLink><br />*<searchLink fieldCode="DE" term="%22Seismology%22">Seismology</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Mount+Etna+%28Italy%29%22">Mount Etna (Italy)</searchLink><br /><searchLink fieldCode="DE" term="%22Sicily+%28Italy%29%22">Sicily (Italy)</searchLink><br /><searchLink fieldCode="DE" term="%22Italy%22">Italy</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: We carried out a study of the seismicity and ground deformation occurring on Mt. Etna volcano after the end of the 2002-2003 eruption and before the onset of the 2004-2005 eruption. Data were recorded by the permanent local seismic network run by Istituto Nazionale di Geofisica e Vulcanologia - Sezione di Catania and by geodetic surveys carried out in July 2003 and July 2004 on the GPS network. Most earthquakes were grouped in two main clusters located in the northeastern and southeastern sectors of the volcano. The areal distribution of seismic energy associated with the recorded earthquakes allowed us to highlight the main seismogenic areas of Mt. Etna. In order to better understand the kinematic processes of the volcano, 3D seismic locations were used to compute fault plane solutions, and a selected dataset was inverted to determine stress and strain tensors. The focal mechanisms in the northeastern sector show clear left-lateral kinematics along an E-W fault plane, consistent with events occurring along the Pernicana Fault system. The fault plane solutions in the southeastern sector show mainly right-lateral kinematics along a NNE and ENE fault plane and left lateral-kinematics along NW fault planes that together suggest roughly E-W oriented compression. Surface ground deformation affecting Mt. Etna measured by GPS surveys highlighted a marked inflation during the same period and exceptionally strong seawards motion of its eastern flank. The 2D geodetic strain tensor distribution was calculated and the results show mainly ENE-WSW extension coupled with WNW-ESE contraction, indicating right-lateral shear along a NW-SE oriented fault plane. The different deformation of the eastern sector of the volcano, as measured by seismicity and ground deformation, must be interpreted by considering the different depths of the two signals. Seismic activity in the southeastern sector of volcano is located between 3 and 8 km b.s.l. and can be associated with a very strong additional E-W compression induced by a pressurizing source just westwards and at the same depth, located by inverting GPS data. Ground deformation, in contrast, is mainly affected by the shallower dynamics of the fast moving eastern flank which produces a shallower opposing E-W extension. The entire dataset shows that two different processes affect the eastern flank at the same time but at different depths; the boundary is clearly located at a depth of 3 km b.s.l. and could represent the décollement surface for the mobile flank. [ABSTRACT FROM AUTHOR] |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1007/s00445-011-0456-1 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 17 StartPage: 869 Subjects: – SubjectFull: Volcanoes Type: general – SubjectFull: Seismology Type: general – SubjectFull: Mount Etna (Italy) Type: general – SubjectFull: Sicily (Italy) Type: general – SubjectFull: Italy Type: general Titles: – TitleFull: Evidence of multiple strain fields beneath the eastern flank of Mt. Etna volcano (Sicily, Italy) deduced from seismic and geodetic data during 2003-2004. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Alparone, Salvatore – PersonEntity: Name: NameFull: Barberi, Graziella – PersonEntity: Name: NameFull: Bonforte, Alessandro – PersonEntity: Name: NameFull: Maiolino, Vincenza – PersonEntity: Name: NameFull: Ursino, Andrea IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 09 Text: Sep2011 Type: published Y: 2011 Identifiers: – Type: issn-print Value: 02588900 Numbering: – Type: volume Value: 73 – Type: issue Value: 7 Titles: – TitleFull: Bulletin of Volcanology Type: main |
| ResultId | 1 |
