Options
High-precision locations of the microseismicity preceding the 2002–2003 Mt. Etna eruption
Author(s)
Language
English
Status
Published
Peer review journal
Yes
Title of the book
Issue/vol(year)
L18604/31(2004)
Publisher
AGU
Pages (printed)
1-4
Issued date
September 18, 2004
Abstract
To recognize possible signals of intrusive processes leading to the last 2002–2003 flank eruption at Mt. Etna, we analyzed the spatial pattern of microseismicity between August 2001 and October 2002 and calculated 23 fault plane solutions (FPSs) for shocks with magnitude greater than 2.5. By applying the double-difference approach of Waldhauser and Ellsworth [2000] on 3D locations, we found that most of the scattered epicentral locations further collapse in roughly linear features. High-precision locations evidenced a distribution of earthquakes along two main alignments, oriented NE-SW to ENE-WSW and NW-SE, matching well both with the known tectonic and volcanic lineaments of Etna and FPSs results. Moreover, microseismicity and swarms located along the NNW-SSE volcano-genetic trend suggest, together with geodetic data and volcanological evidence that progressive magma refilling has occurred since February 2002.
References
Azzaro, R. (1999), Earthquake surface faulting at Mount Etna volcano (Sicily) and implications for active tectonics, J. Geodyn., 28, 193–213.[CrossRef]
Bonaccorso, A. (2001), Mt. Etna volcano: Modelling of ground deformation patterns of recent eruptions and considerations on the associated precursors, J. Volcanol. Geotherm. Res., 109, 99–108.[CrossRef]
Bonaccorso, A., S. D'Amico, M. Mattia, and D. Patanè (2004), Intrusive mechanisms at Mt. Etna forerunning the July–August 2001 eruption, Pure Appl. Geophys., 161, 1469–1487.[CrossRef]
Hirn, A., A. Nercessian, M. Sapin, F. Ferrucci, and G. Wittlinger (1991), Seismic heterogeneity of Mt. Etna: Structure and activity, Geophys. J. Int., 105, 139–153.
Lahr, J. C. (1989), HYPOELLIPSE/VERSION 2.0*: A computer program for determining local earthquake hypocentral parameters, magnitude, and first motion pattern, U.S. Geol. Surv. Open File Rep., 89/116, 81 pp.
Laigle, M., A. Hirn, M. Sapin, J.-C. Lepine, J. Diaz, J. Gallart, and R. Nicolich (2000), Mount Etna dense array local earthquake P and S tomography and implications for volcanic plumbing, J. Geophys. Res., 105, 21,633–21,646.[AGU]
Michelini, A., and A. Lomax (2004), The effect of velocity structure errors on double-difference earthquake locations, Geophys. Res. Lett., 31, L09602, doi:10.1029/2004GL019682.[AGU]
Patanè, D., C. Chiarabba, P. De Gori, and A. Bonaccorso (2003), Magma ascent and the pressurization of Mt. Etna's volcanic system, Science, 299, 2061–2063.[CrossRef]
Reasenberg, P., and D. Oppenheimer (1985), FPFIT, FPPLOT, and FPPAGE: FORTRAN computer programs for calculating and displaying fault plane solutions, U.S. Geol. Surv. Open File Rep., 85/739, 109 pp.
Thurber, C. H. (1993), Local earthquake tomography: Velocity and VP/VS-theory, in Seismic Tomography: Theory and Practice, edited by H. M. Iyer and K. Hirahara, pp. 563–583, Chapman and Hall, New York.
Waldhauser, F. (2001), HypoDD: A computer program to compute double-difference earthquake locations, U.S. Geol. Surv. Open File Rep., 01–113.
Waldhauser, F., and W. L. Ellsworth (2000), A double-difference earthquake location algorithm: Method and application to the northern Hayward fault, Bull. Seismol. Soc. Am., 90, 1353–1368.
Bonaccorso, A. (2001), Mt. Etna volcano: Modelling of ground deformation patterns of recent eruptions and considerations on the associated precursors, J. Volcanol. Geotherm. Res., 109, 99–108.[CrossRef]
Bonaccorso, A., S. D'Amico, M. Mattia, and D. Patanè (2004), Intrusive mechanisms at Mt. Etna forerunning the July–August 2001 eruption, Pure Appl. Geophys., 161, 1469–1487.[CrossRef]
Hirn, A., A. Nercessian, M. Sapin, F. Ferrucci, and G. Wittlinger (1991), Seismic heterogeneity of Mt. Etna: Structure and activity, Geophys. J. Int., 105, 139–153.
Lahr, J. C. (1989), HYPOELLIPSE/VERSION 2.0*: A computer program for determining local earthquake hypocentral parameters, magnitude, and first motion pattern, U.S. Geol. Surv. Open File Rep., 89/116, 81 pp.
Laigle, M., A. Hirn, M. Sapin, J.-C. Lepine, J. Diaz, J. Gallart, and R. Nicolich (2000), Mount Etna dense array local earthquake P and S tomography and implications for volcanic plumbing, J. Geophys. Res., 105, 21,633–21,646.[AGU]
Michelini, A., and A. Lomax (2004), The effect of velocity structure errors on double-difference earthquake locations, Geophys. Res. Lett., 31, L09602, doi:10.1029/2004GL019682.[AGU]
Patanè, D., C. Chiarabba, P. De Gori, and A. Bonaccorso (2003), Magma ascent and the pressurization of Mt. Etna's volcanic system, Science, 299, 2061–2063.[CrossRef]
Reasenberg, P., and D. Oppenheimer (1985), FPFIT, FPPLOT, and FPPAGE: FORTRAN computer programs for calculating and displaying fault plane solutions, U.S. Geol. Surv. Open File Rep., 85/739, 109 pp.
Thurber, C. H. (1993), Local earthquake tomography: Velocity and VP/VS-theory, in Seismic Tomography: Theory and Practice, edited by H. M. Iyer and K. Hirahara, pp. 563–583, Chapman and Hall, New York.
Waldhauser, F. (2001), HypoDD: A computer program to compute double-difference earthquake locations, U.S. Geol. Surv. Open File Rep., 01–113.
Waldhauser, F., and W. L. Ellsworth (2000), A double-difference earthquake location algorithm: Method and application to the northern Hayward fault, Bull. Seismol. Soc. Am., 90, 1353–1368.
Type
article
File(s)
No Thumbnail Available
Name
934 Gambino et al.pdf
Size
1.82 MB
Format
Adobe PDF
Checksum (MD5)
e98985edb9bf787e1951e837775ed0e5
No Thumbnail Available
Name
AGU.html
Size
490 B
Format
HTML
Checksum (MD5)
dbcde1ee7cb81ac6762726ec82100e42