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A shear wave analysis system for semi-automatic measurements of shear wave splitting above volcanic earthquakes: descriptions and applications
Sponsors
INGV-Osservatorio Vesuviano
Language
English
Obiettivo Specifico
1.4. TTC - Sorveglianza sismologica delle aree vulcaniche attive
3.6. Fisica del vulcanismo
Status
Published
Peer review journal
No
Issued date
2007
Abstract
Our interest is the study of the seismograms with the purpose of monitoring and modelling
volcanoes. In particular, since the shear waves bring information about the anisotropic system
characterizing the shallow crust, they are also sensitive to all temporal variations caused by
changes in the stress field acting on the area. Therefore we intend to realize an algorithm that
can provide shear wave splitting estimates in quasi-real time and in a semi-automatic way.
Finally we perform validation tests on both real and synthetic data, in order to define the
accuracy and validity range of our program.
volcanoes. In particular, since the shear waves bring information about the anisotropic system
characterizing the shallow crust, they are also sensitive to all temporal variations caused by
changes in the stress field acting on the area. Therefore we intend to realize an algorithm that
can provide shear wave splitting estimates in quasi-real time and in a semi-automatic way.
Finally we perform validation tests on both real and synthetic data, in order to define the
accuracy and validity range of our program.
References
Bianco F., L. Scarfì, E. Del Pezzo, and D. Patanè (2006). Shear wave splitting changes associated with the 2001 volcanic eruption on Mt Etna. Geophys. J. Int. 167, 959-967.
Crampin S., and S. V. Zatsepin (1997). Modeling the compliance of crustal rock-II. Response to
temporal changes before earthquakes. Geophys. J. Int. 129, 495-506.
Crampin, S. (1999). Calculable fluid-rock interactions. J. Geol. Soc. 156, 501-512.
Crampin S., and S. Chastin (2003). A review of shear wave splitting in the crack-critical crust.
Geophys. J. Int. 155, 221-240.
Crampin S. and Y. Gao (2006). A review of techniques for measuring shear-wave splitting above
small earthquakes. Phys. Earth Planet. Interiors 159, 1-14.
Del Pezzo E., F. Bianco, S. Petrosino, and G. Saccorotti (2004). Changes in coda decay rate and
shear-wave splitting parameters associated with seismic swarms at Mt. Vesuvius, Italy. Bull.
Seism. Soc. Am. 94, 2, 439-452.
Gerst A., and M. Savage (2004). Seismic Anisotropy Beneath Ruapehu Volcano: A Possible
Eruption Forecasting Tool. Science 306, 1543-1547.
Mardia K.V., and P.E. Jupp (2000). Directional statistics. Ed.Wiley and Sons Ltd.
Musumeci C., O. Cocina, P. De Gori, D. Patanè (2004). Seismological evidence of stress induced
by dike injection during the 2001 Mt. Etna eruption. Geophys. Res. Lett. 31, L07617,
doi:10.1029/2003GL019367.
Savage M.K., W.A. Peppin, and U.R. Vetter (1990). Shear wave anisotropy and stress direction in
and near the Long Valley caldera, California, 1979/1988. J. Geophys. Res. 95, 11,165-11,177.
Teanby N.A., J.M. Kendall, and M. van der Baan (2004). Automation of shear-wave splitting
measurements using cluster analysis. Bull. Seism. Soc. Am. 94, 2, 453-463.
VanDecar J.C., and R.S. Crosson (1990). Determination of teleseismic relative phase arrival time
using multi-channel cross-correlation and least squares. Bull. Seism. Soc. Am. 80, 1, 150-169.
Zatsepin S. V., and S. Crampin (1997). Modeling the compliance of crustal rock-I. Response of
shear-wave splitting to differential stress. Geophys. J. Int. 129, 477-494.
Crampin S., and S. V. Zatsepin (1997). Modeling the compliance of crustal rock-II. Response to
temporal changes before earthquakes. Geophys. J. Int. 129, 495-506.
Crampin, S. (1999). Calculable fluid-rock interactions. J. Geol. Soc. 156, 501-512.
Crampin S., and S. Chastin (2003). A review of shear wave splitting in the crack-critical crust.
Geophys. J. Int. 155, 221-240.
Crampin S. and Y. Gao (2006). A review of techniques for measuring shear-wave splitting above
small earthquakes. Phys. Earth Planet. Interiors 159, 1-14.
Del Pezzo E., F. Bianco, S. Petrosino, and G. Saccorotti (2004). Changes in coda decay rate and
shear-wave splitting parameters associated with seismic swarms at Mt. Vesuvius, Italy. Bull.
Seism. Soc. Am. 94, 2, 439-452.
Gerst A., and M. Savage (2004). Seismic Anisotropy Beneath Ruapehu Volcano: A Possible
Eruption Forecasting Tool. Science 306, 1543-1547.
Mardia K.V., and P.E. Jupp (2000). Directional statistics. Ed.Wiley and Sons Ltd.
Musumeci C., O. Cocina, P. De Gori, D. Patanè (2004). Seismological evidence of stress induced
by dike injection during the 2001 Mt. Etna eruption. Geophys. Res. Lett. 31, L07617,
doi:10.1029/2003GL019367.
Savage M.K., W.A. Peppin, and U.R. Vetter (1990). Shear wave anisotropy and stress direction in
and near the Long Valley caldera, California, 1979/1988. J. Geophys. Res. 95, 11,165-11,177.
Teanby N.A., J.M. Kendall, and M. van der Baan (2004). Automation of shear-wave splitting
measurements using cluster analysis. Bull. Seism. Soc. Am. 94, 2, 453-463.
VanDecar J.C., and R.S. Crosson (1990). Determination of teleseismic relative phase arrival time
using multi-channel cross-correlation and least squares. Bull. Seism. Soc. Am. 80, 1, 150-169.
Zatsepin S. V., and S. Crampin (1997). Modeling the compliance of crustal rock-I. Response of
shear-wave splitting to differential stress. Geophys. J. Int. 129, 477-494.
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