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Southern-Tyrrhenian seismicity in space-time-magnitude domain
Author(s)
Language
English
Status
Published
Title of the book
JCR Journal
JCR Journal
Peer review journal
Yes
Volume or Series
6/49 (2006)
Issued date
November 23, 2006
Abstract
An analysis is conducted on a catalogue containing more than 2000 seismic events
occurred in the southern Tyrrhenian Sea between 1988 and October 2002, as an attempt
to characterise the main seismogenetic processes active in the area in space, time and magnitude domain by means of the parameters of phenomenological laws.
We chose to adopt simple phenomenological models, since the low number of data did
not allow to use more complex laws.
The two main seismogenetic volumes present in the area were considered for the purpose
of this work. The first includes a nearly homogeneous distribution of hypocentres in a
NW steeply dipping layer as far as about 400 km depth. This is probably the seismological
expression of the Ionian lithospheric slab subducting beneath the Calabrian Arc.
The second contains hypocentres concentrated about a sub-horizontal plane lying at
an average depth of about 10 km. It is characterised by a background seismicity spread all over the area and by clusters of events that generally show a direction of maximum elongation.
The parameters of the models describing seismogenetically homogeneous subsets of the
earthquake catalogue in the three analysis domains, along with their confidence intervals, are estimated and analysed to establish whether they can be regarded as representative of a particular subset.
occurred in the southern Tyrrhenian Sea between 1988 and October 2002, as an attempt
to characterise the main seismogenetic processes active in the area in space, time and magnitude domain by means of the parameters of phenomenological laws.
We chose to adopt simple phenomenological models, since the low number of data did
not allow to use more complex laws.
The two main seismogenetic volumes present in the area were considered for the purpose
of this work. The first includes a nearly homogeneous distribution of hypocentres in a
NW steeply dipping layer as far as about 400 km depth. This is probably the seismological
expression of the Ionian lithospheric slab subducting beneath the Calabrian Arc.
The second contains hypocentres concentrated about a sub-horizontal plane lying at
an average depth of about 10 km. It is characterised by a background seismicity spread all over the area and by clusters of events that generally show a direction of maximum elongation.
The parameters of the models describing seismogenetically homogeneous subsets of the
earthquake catalogue in the three analysis domains, along with their confidence intervals, are estimated and analysed to establish whether they can be regarded as representative of a particular subset.
References
Adelfio, G., Chiodi, M., De Luca, L. and Luzio, D.(2006): Earthquakes clustering
based on maximum likelihood estimation of point process conditional intensity
function, in Proceedings of the “The 4th International Workshop on Statistical Seismology (Statsei4)”, Meeting, Shonan Village campus, Kanagawa Prefecture, Japan, 9-13 January 2006.
Bender, B. (1983): Maximum likelihood estimation of b values for magnitude grouped
data, Bull. Seism. Soc. Am., 73, 831-851.
Capizzi, P., L. De Luca, D. Luzio and M. Vitale (2001): Procedura di ottimizzazione
di un modello di velocità 1D applicata ai terremoti locali dell’area tirrenica, Atti
del 20° Convegno G.N.G.T.S., Roma (CD ROM).
Console, R. (2001): Testing earthquake forecast hypotheses, Tectonophysics, 338,
261-268.
De Luca, L., D. Luzio and M. Vitale (1999): Fractal dimension confidence interval
estimation of epicentral distributions, Annali di Geofisica, 42 (5), 911-925.
De Luca, L., D. Luzio and M. Vitale (2002): A ML estimator of the correlation
dimension for left-hand truncated data samples, Pageoph, 159, 2789-2803.
Giunta, G., D. Luzio, E. Tondi, L. De Luca, A. Giorgianni, G. D’Anna, P.
Renda, G. Cello, F. Nigro and M. Vitale (2004): The Palermo (Sicily) seismic
cluster of September 2002, in the seismotectonic framework of the Tyrrhenian Sea-Sicily border area, Ann. Geophys., 47 (6), 1755-1770.
Giunta, G., F. Nigro, P. Renda and A. Giorgianni (2000): The Sicilian-Maghrebides
Tyrrhenian Margin: a neotectonic evolutionary model, Boll. Soc. Geol. It., 119, 553-
565.
Reasenberg, P. (1985): Second-order moment of central california seismicity, 1969-1982, Journal of Geophysical Research, 90 (B7), 5479-5495.
Silverman, B. W. (1986): Density Estimation for Statistics and Data Analysis, Chapman
and Hall, London.
Tinti, S. and F. Mulargia (1987): Confidence intervals of b-values for grouped magnitudes,
Bull. Seismol. Soc. Am., 77, 2125-2134.
Utsu, T. (1961): Statistical study on the occurrence of aftershocks, Geophys. Mag.,
30, 521-605.
Utsu, T. (1965): A method for determining the value of b in a formula logn=a-bm
showing the magnitude-frequency relation for earthquakes, Geophys. Bull. Hokkaido
Univ., 13, 99-10.
Wyss, M. (1973): Towards a physical understanding of the earthquake frequency distribution, Geophys. J. R. Astr. Soc., 31, 341-359.
based on maximum likelihood estimation of point process conditional intensity
function, in Proceedings of the “The 4th International Workshop on Statistical Seismology (Statsei4)”, Meeting, Shonan Village campus, Kanagawa Prefecture, Japan, 9-13 January 2006.
Bender, B. (1983): Maximum likelihood estimation of b values for magnitude grouped
data, Bull. Seism. Soc. Am., 73, 831-851.
Capizzi, P., L. De Luca, D. Luzio and M. Vitale (2001): Procedura di ottimizzazione
di un modello di velocità 1D applicata ai terremoti locali dell’area tirrenica, Atti
del 20° Convegno G.N.G.T.S., Roma (CD ROM).
Console, R. (2001): Testing earthquake forecast hypotheses, Tectonophysics, 338,
261-268.
De Luca, L., D. Luzio and M. Vitale (1999): Fractal dimension confidence interval
estimation of epicentral distributions, Annali di Geofisica, 42 (5), 911-925.
De Luca, L., D. Luzio and M. Vitale (2002): A ML estimator of the correlation
dimension for left-hand truncated data samples, Pageoph, 159, 2789-2803.
Giunta, G., D. Luzio, E. Tondi, L. De Luca, A. Giorgianni, G. D’Anna, P.
Renda, G. Cello, F. Nigro and M. Vitale (2004): The Palermo (Sicily) seismic
cluster of September 2002, in the seismotectonic framework of the Tyrrhenian Sea-Sicily border area, Ann. Geophys., 47 (6), 1755-1770.
Giunta, G., F. Nigro, P. Renda and A. Giorgianni (2000): The Sicilian-Maghrebides
Tyrrhenian Margin: a neotectonic evolutionary model, Boll. Soc. Geol. It., 119, 553-
565.
Reasenberg, P. (1985): Second-order moment of central california seismicity, 1969-1982, Journal of Geophysical Research, 90 (B7), 5479-5495.
Silverman, B. W. (1986): Density Estimation for Statistics and Data Analysis, Chapman
and Hall, London.
Tinti, S. and F. Mulargia (1987): Confidence intervals of b-values for grouped magnitudes,
Bull. Seismol. Soc. Am., 77, 2125-2134.
Utsu, T. (1961): Statistical study on the occurrence of aftershocks, Geophys. Mag.,
30, 521-605.
Utsu, T. (1965): A method for determining the value of b in a formula logn=a-bm
showing the magnitude-frequency relation for earthquakes, Geophys. Bull. Hokkaido
Univ., 13, 99-10.
Wyss, M. (1973): Towards a physical understanding of the earthquake frequency distribution, Geophys. J. R. Astr. Soc., 31, 341-359.
Type
article