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Volcanic tremor location during the 2004 Mount Etna lava effusion
Language
English
Status
Published
Peer review journal
Yes
Title of the book
Issue/vol(year)
/33 (2006)
Publisher
AGU
Pages (printed)
L09304
Issued date
2006
Keywords
Abstract
A lava emission started at Mt. Etna, Italy, on 7
September, 2004. Neither earthquake seismicity heralded or
accompanied the opening of the fracture field from which
the lava poured out, nor volcanic tremor changed in
amplitude and frequency content at the onset of the
effusive activity. To highlight long-term changes, we
propose a method for the location of the tremor source
based on a 3D grid search, using the amplitude decay of the
seismic signal, from January to November 2004. We find
the centroid of the tremor source within a zone close to and
partially overlapped with the summit craters (pre-effusive
phase), which extended up to 2 km south of them (effusive
phase). The depths are of between 1698 and 2387 m a.s.l.
We hypothesize the lava effusion stemmed from a degassed
magma body, although we find evidence of temporary
magma overpressure conditions, such as those documented
on 25 September.
September, 2004. Neither earthquake seismicity heralded or
accompanied the opening of the fracture field from which
the lava poured out, nor volcanic tremor changed in
amplitude and frequency content at the onset of the
effusive activity. To highlight long-term changes, we
propose a method for the location of the tremor source
based on a 3D grid search, using the amplitude decay of the
seismic signal, from January to November 2004. We find
the centroid of the tremor source within a zone close to and
partially overlapped with the summit craters (pre-effusive
phase), which extended up to 2 km south of them (effusive
phase). The depths are of between 1698 and 2387 m a.s.l.
We hypothesize the lava effusion stemmed from a degassed
magma body, although we find evidence of temporary
magma overpressure conditions, such as those documented
on 25 September.
References
Aki, K., and V. Ferrazzini (2000), Seismic monitoring and modeling of an
active volcano for prediction, J. Geophys. Res., 105, 16,617– 16,640.
Battaglia, J., and K. Aki (2003), Location of seismic events and eruptive
fissures on the Piton de la Fournaise volcano using seismic amplitudes,
J. Geophys. Res., 108(B8), 2364, doi:10.1029/2002JB002193.
Battaglia, J., J. L. Got, and P. Okubo (2003), Location of long-period events
below Kilawea volcano using seismic amplitudes and accurate relative
relocation, J. Geophys. Res., 108(B12), 2553, doi:10.1029/
2003JB002517.
Burton, M. R., et al. (2005), Etna 2004–2005: An archetype for geodynamically-
controlled effusive eruptions, Geophys. Res. Lett., 32, L09303,
doi:10.1029/2005GL022527.
De Gori, P., C. Chiarabba, and D. Patane` (2005), Qp structure of Mount
Etna: Constraints for the physics of the plumbing system, J. Geophys.
Res., 110, B05303, doi:10.1029/2003JB002875.
Efron, B. (1982), The Jackknife, the Bootstrap and Other Resampling
Plans, Soc. for Ind. and Appl. Math., Philadelphia, Pa.
Hoffstetter, A., and S. Malone (1986), Observations of volcanic tremor at
Mount St. Helens in April and May 1980, Bull. Seismol. Soc. Am., 76,
923– 938.
Knopoff, K. (1964), Q, Rev. Geophys., 2, 625– 660.
Me´taxian, J. P., P. Lesage, and J. Dorel (1997), Permanent tremor of Masaya
volcano, Nicaragua: Wave field analysis and source location,
J. Geophys. Res., 102, 22,529– 22,545.
Patane`, D., O. Cocina, S. Falsaperla, E. Privitera, and S. Spampinato
(2004), Mt Etna volcano: A seismological framework, in Mt. Etna: Volcano
Laboratory, Geophys. Monogr. Ser., vol. 148, edited by
A. Bonaccorso et al., pp. 147– 165, AGU, Washington, D. C.
active volcano for prediction, J. Geophys. Res., 105, 16,617– 16,640.
Battaglia, J., and K. Aki (2003), Location of seismic events and eruptive
fissures on the Piton de la Fournaise volcano using seismic amplitudes,
J. Geophys. Res., 108(B8), 2364, doi:10.1029/2002JB002193.
Battaglia, J., J. L. Got, and P. Okubo (2003), Location of long-period events
below Kilawea volcano using seismic amplitudes and accurate relative
relocation, J. Geophys. Res., 108(B12), 2553, doi:10.1029/
2003JB002517.
Burton, M. R., et al. (2005), Etna 2004–2005: An archetype for geodynamically-
controlled effusive eruptions, Geophys. Res. Lett., 32, L09303,
doi:10.1029/2005GL022527.
De Gori, P., C. Chiarabba, and D. Patane` (2005), Qp structure of Mount
Etna: Constraints for the physics of the plumbing system, J. Geophys.
Res., 110, B05303, doi:10.1029/2003JB002875.
Efron, B. (1982), The Jackknife, the Bootstrap and Other Resampling
Plans, Soc. for Ind. and Appl. Math., Philadelphia, Pa.
Hoffstetter, A., and S. Malone (1986), Observations of volcanic tremor at
Mount St. Helens in April and May 1980, Bull. Seismol. Soc. Am., 76,
923– 938.
Knopoff, K. (1964), Q, Rev. Geophys., 2, 625– 660.
Me´taxian, J. P., P. Lesage, and J. Dorel (1997), Permanent tremor of Masaya
volcano, Nicaragua: Wave field analysis and source location,
J. Geophys. Res., 102, 22,529– 22,545.
Patane`, D., O. Cocina, S. Falsaperla, E. Privitera, and S. Spampinato
(2004), Mt Etna volcano: A seismological framework, in Mt. Etna: Volcano
Laboratory, Geophys. Monogr. Ser., vol. 148, edited by
A. Bonaccorso et al., pp. 147– 165, AGU, Washington, D. C.
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