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MAPPING OF CODA ATTENUATION AT THE EXTEND OF THE NATIONAL SEISMOLOGICAL NETWORK OF GREECE

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I. Baskoutas, M. Herraiz, A. C. Perez, I. Kalogeras, G. Panopoulou, M. Sachpazi, G. Papadopoulos
I. Baskoutas, M. Herraiz, A. C. Perez, I. Kalogeras, G. Panopoulou, M. Sachpazi, G. Papadopoulos

Abstract


Coda decay rates of 538 vertical components corresponding to local earthquakes which occurred in Greece during the period 1998 to 1999 were used to deduce the coda quality factor (Qc) characteristics in the Hellenic area. The seismograms have been selected from a broader sample of 776 records obtained at 8 stations of the National Seismographic Network operated by the Institute of Geodynamics of the National Observatory of Athens. Earthquake magnitudes range from 2.5 to 4.0; epicentral distances and depths are smaller than 100 km and 40 km, respectively. Using the Single Back Scattering model, the dependence of Qc on frequencies between 1 and 10 Hz has been investigated at each station and the usual Qc =Qo f relationships have been deduced. The spatial distribution of Qo has been drawn using waves that sample approximately equivalent ellipsoidal volumes with semiminor axis up to 100 km. The corresponding map shows a decreasing trend in SN direction.


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References


Aki.K. & Chouet B. 1975. Origin of coda waves: source, attenuation, & scattering effects. Journal of Geophysical Research, 80, 23, 3322-3342.

Baskoutas I. 1993. Contribution on the study of the attenuation of seismic coda in central Greece. Ph.D Thesis, University of Athens, 246pp.

Baskoutas I., Makropoulos K. & Sato H. 1995. Mean free path for S-wave scattering under central Greece. Boll. di Geof. Teor. ed Appi., 145, 73-80.

Baskoutas 1.1996. Dependence of coda attenuation on frequency and lapse time in central Greece". Pure Appi. Geophys., 147, 3, 483-496.

Baskoutas I. 1998. Study of spatial distribution of coda Q with respect to the seismicity in central Greece. Bull Geol. Soc. Greece, 32/1 197-203.

Baskoutas I., Makropoulos K., Drakopoulos J. & V. Kouskouna. 1989. Evaluation of seismic Q in central Greece from local events. Proceed Int. Symp. on the Analysis of Seismicity and Seismic Risk, Bechyne Castle, Czechoslovakia, Sep. 4-9, 1989, 162-170.

Baskoutas I., Panopoulou G., Makropoulos K. & J. Drakopoulos. 1992. Analysis of seismic coda by using seismic analog data of WSSN ΑΤΗ station. 6* Congress of the Hellenic Geological Society, Athens, (in Greek).

Baskoutas I., Stavrakakis G.N. & I. S. Kalogeras. 1998. Q factor estimation from the aftershock sequence of the 13 May 1995 Kozani earthquake.J. Geodynamics, 26, 2-4, 367-374.

Baskoutas I., Panopoulou, G., & Th. Rontoyanni. 2000. The seismic attenuation in two regions with different geological aspect. Boll. Geof. Theor. Appi., 41,3,233-242.

Hatzidimithou P. M. 1993. Attenuation of coda waves in northern Greece. Pageoph., 140, 63-78.

Hatzidimitriou P.M. 1995. S-wave attenuation in the crust in northern Greece. Bull. Seism. Soc. Am. 85, 5, 1381-1387.

Havskov J., Malone S., McClurg D. & Crosson R. 1989. Coda Q for the state of Washington, Bull. Seism. Soc. Am. 79, 4, 1024-1038.

Kovachev, S.A., Kuzin, I.P., Shoda, O.Yu. and Soloviev, S.L. 1991. Attenuation of S waves in the lithosphère of the sea of Crete according to OBS observations. Phys. Earth Planet. Interiors, 69, 101-111.

Martin C. 1988. Geometrie et cinématique de la subduction Egeenne; structure en vitesse et en attenuation sous le Péloponnèse. These Univ. Joseph Fourier, Grenoble.

Παναγιωτόπουλος, Δ. Γ., Χατζηδημητρίου, Π. Μ. και Τσοκος, Γρ. 1998. Δομή της λιθόσφαιρας στο Αιγαίο και τις γύρω περιοχέ; Με βάση τις ταχύτητες των σεισμικών κυμάτων, την κατανομή της πυκνότητας και την απόσβεση των σεισμικών κυμάτων. «Βασικά αποτελέσματα της σεισμολογικής έρευνας στην Ελλάδα», Εκδόσεις Ζήτη, Θεσσαλονίκη.

Papazachos, C.B. 1992. Anisotropic radiation modelling of macroseismic intensities for estimation of the attenuation structure of the upper crust in Greece. Pure Appi. Geophys., 138, 3, 445470.

Papazachos B. & Papazachou C. 1997. The Earthquakes of Greece. Editions Ziti. Thessaloniki.

Papazachos Β. Papaioannou Ch.A. Papazachos C. & Savvaidis A.S. 1997. Atlas of isoseismal maps for strong M > 5 shallow h < 60 km earthquakes in Greece and surrounding area 426 BC-1995. Geophys. Lab., Univ. of Thessaloniki, 4, 187pp.

Perez A.C. 2000. Atenuación de ondas Coda en Grecia. Trabajo de Investigación dentro del programa de Doctorado de Geodesia, Geofisica y Meteorologia. Universidad Complutense de Madrid, 109 pp.

Pulli J.J. 1984. Attenuation of coda waves in New England Bull.Seism Soc.Am., 74, 4, 1149-1166.

Sato H. 1977a. Energy propagation including scattering effects single isotropic scattering aproximation. J. Phys. Earth, 25, 27-41.

Sato H. 1977b. Single isotropic scattering model including wave conversions simple theoretical model of the short period body wave propagation. J. Phys. Earth, 25, 163-176.

Tselentis G.A. Drakopoulos J.,& Makropoulos C. 1988. On the frequency dependence of Q in the Kalamata South Greece region as obtained from the analysis of the coda of the afthershocks of the Kalamata 1986 earthquake. Tectonophysics, 152, 157-159.

Tselentis G.A. 1993b. Depth dependent seismic attenuation in western Greece. Tectonophysics 225, 523-528.

Tselentis G.A. 1997. Evidence for stability in coda Q associated with the Egion central Greece earthquake of 15 June 1995. Bull. Seism. Soc. Am., 87, 6, 1679-1684.


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