Recent 2005-2006 strong seismic activity in Greece under the aspect of seismicity parameters temporal variation analysis


I. Baskoutas
G. A. Papadopoulos
V. Karakostas
E. Papadimitriou
Résumé

Recent strong seismic excitation (2005-2006), which occurred at the northwestern part of the Hellenic arc and north ofSamos Island close to the coasts of the Asia Minor, is investigated under the aspect of temporal variation seismicity profile of activated seismic zones. Seismicity profile is constructed by the means ofther FastBEE analysis introduced recently. Seismicity parameters considered in this study are b-value, energy releasee in the form logE2/3 and the quantity logNofthe cumulative number of events, in the examined area. Due to homogeneity and completeness reasons, the earthquakes with magnitudes Mi>3.0 since 1990 from the earthquake catalogue of the Geodynamic Institute of the National Observatory of Athens, is used to perform the present analysis in both areas. Temporal variation profiles for both areas show a remarkable fluctuation around their mean value and specifically above the limits of the calculated standard errors behaviour forming a temporal pattern, which can be attributed to earthquake preparation process. In this temporal pattern, b value, which is related to the seismogenic process in many previous studies all over the world shows a tendency to increase and then to decrease before the occurrence of a strong earthquake, and at the same time the quantity logE 3 shows a tendency to decrease and then to increase before the strong event occurrence Mis identification of such a clear pattern for a period of time can be attributed to the lack of adequate data.

Article Details
  • Rubrique
  • Geophysics and Seismology
Téléchargements
Les données relatives au téléchargement ne sont pas encore disponibles.
Références
Baskoutas, I, Papadopoulos, G., and Panopoulou, G., 2004. Long temporal variation of seismic parameters for seismic patterns identification in Greece, Bulletin of Geological Society of Greece. Proc. of the 10th Inter. Con. Thessaloniki, April 2004. (in press)
Carter, J.Α., and Berg, E., 1981. Relative stress variations as determined by b-values from earthquakes in Circum-Pacific subduction zones, Tectonophysics, 76, 257- 271.
Harris, R.A., 1998. Forecasts of the Loina Prieta, California, earthquake, Bull. Seismol Soc. Am., 88: 898-916.
Imoto, M., 1991. Changes in the magnitude-frequency b-value prior to large (M _ 6.0) earthquakes in Japan, Tectonophysics, 193, 311 -325.
Kisslinger, C, Mc Donald, C, and Bowman, J.R., 1985. Precursory Time-space Patterns of Seismicity and their Relation to Fault Processes in the Central Aleutian Islands Seismic Zone, Abstracts, 23rd. General Assembly of IASPEI, 32p.
Mogi, Κ., 1962. Magnitude-frequency relation for elastic shocks accompanying fractures of various materials and some related problems in earthquakes, Bull. Earthq. Res. Inst., 40, 831—853.
Papadopoulos, G., Baskoutas, I., and Stavrakakis, G., 2003. Tools for theFast Estimation of Expected Big Earthquake in predefined seismic prone areas, Ith International Workshop on Earthquake Prediction. Athens, November 2003.
Press, F., and Allen, C, 1995. Patterns of seismic release in the southern California region, J. Geophys. Res., 100,6421-6430.
Romanowicz, B., 1993. Spatiotemporal patterns in the energy release of great earthquakes, Science, 260, 1923- 1926.
Scholz, C.H. 1968. The frequency-magnitude relation of microfracturing in rocks and its relation to earthquakes. Bull, seismol. Soc. Amer., 58, 1, 399-415.
Scholz, C, H., 1990. The Mechanics of Earthquakes arid Faulting, Cambridge University Press, Cambridge, UK.
Wang, J. H., 1988. b-values of shallow earthquakes in Taiwan, Bull. Seismol. Soc. Am., 78, 1243—1254.
Wyss, M., 1973. Towards a physical understanding of the earthquake frequency distribution, J. R. Astron. Soc, 31, 341- 359.
Articles les plus lus par le même auteur ou la même autrice