Abstract
Information concerning a total number of 13700 instrumentally recorded earthquakes is used to study the geographical and the vertical distribution of the Earth's seismicity. From these earthquakes, which form four complete samples of data (M ≥ 7.0, 1894–1992; M ≥ 6.5, 1930–1992; M ≥ 6.0, 1953–1992; M ≥ 5.5, 1966–1992), 11511 are shallow (h ≤ 60 km), 2085 are of intermediate focal depth (61 ≤ h ≤ 300 km) and 564 are deep focus earthquakes (301 ≤ h ≤ 720 km). The parameters a and b of the frequency-magnitude relationship were calculated in a grid of equally spaced points at 1° by using the data of earthquakes located inside circles centered at each point. The radius of the circles increased from 30 km with a step of 10 km until the information for the earthquakes located inside the circle fulfil three criteria which concern the size of the sample used to compute these parameters at each point of the grid. The results are given in a qualitative way (epicenter maps) as well as in a quantitative way (mean return periods).
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References
Allen, C. R., Amand, P. S., Richter, C. F. and Nordquist, J. M., 1965, Relation between seismicity and geological structure in the southern California region, Bull. Seismol. Soc. Am. 55, 752–797.
Bath, M., 1973, Introduction to Seismology, Birkhauser Verlag, Basel, 355 pp.
Bath, M., 1981, Earthquake recurrence of a particular type, Pageoph 119, 1063–1076.
Bath, M. and Duda, S. J., 1979, Some aspects of global seismicity, Tectonophysics 54, T1–T8.
Bloom, E. D. and Erdmann, R. C., 1980, The observation of a universal shape regularity in earthquake frequency-magnitude distributions, Bull. Seismol. Soc. Am. 70, 349–362.
Comninakis, P. E., 1975, Contribution to the study of the seismicity of Greece, Ph.D. Thesis, Univ. of Athens, 110 pp.
Duda, S. J., 1965, Secular seismic energy release in circum-Pacific belt, Tectonophysics 2, 409–452.
Galanopoulos, A. G., 1972, Annual and maximum possible strain accumulation in the major area of Greece, Ann. Geol. Pays Hellenique 24, 467–480.
Gutenberg, B. and Richter, C. F., 1944, Frequency of earthquakes in California, Bull. Seismol. Soc. Am. 34, 185–188.
Gutenberg, B. and Richter, C. F., 1954, Seismicity of the Earth and associated phenomena, Princeton Univ. Press, Princeton N.Y., 310 pp.
Hatzidimitriou, P. M., Papadimitriou, E. E., Mountrakis, D. M. and Papazachos, B. C., 1985, The seismic parameter b of the frequency-magnitude relation and its association with the geological zones in the area of Greece, Tectonophysics 120, 141–151.
Makropoulos, K. C. and Burton, P. W., 1983, Seismic risk of circum-Pacific earthquakes: I. Strain energy release, Pageoph 121, 247–267.
Makropoulos, K. C. and Burton, P. W., 1985, Seismic hazard in Greece: I. Magnitude recurrence, Tectonophysics 117, 205–257.
Miyamura, S., 1962, Magnitude-frequency relations and its bearings on geotectonics, Proc. Jap. Acad. 38, 27–30.
Mogi, K., 1967, Earthquakes and fractures, Tectonophysics 5, 35–55.
Pacheco, J. F. and Sykes, L. R., 1992, Seismic moment catalog of large shallow earthquakes, 1900 to 1989, Bull. Seismol. Soc. Am. 82, 1306–1349.
Papazachos, B. C., 1974, Dependence of the seismic parameter b on the magnitude range, Pageoph 112, 1059–1065.
Papazachos, B. C., 1990, Seismicity of the Aegean and surrounding area, Tectonophysics 178, 287–308.
Papazachos, B. C., Tsapanos, T.M., Scordilis, E.M., Bagiatis, C. B. and Koukouvinos, Ch. C., 1990, Evidence for a stochastic model of global seismicity, Proc. of the 5th Congress of the Geological Society of Greece, 24–27 May, Thessaloniki, Greece, 205–216.
Rundle, J. B., 1989, Derivation of the complete Gutenberg–Richter magnitude-frequency relation using the principle of scale invariance, J. Geophys. Res. 94, 12337–12342.
Ryall, A. S. and van Wormer, J. D., 1980, Estimation of maximum magnitude and recommended seismic zone changes in the western great basin, Bull. Seismol. Soc. Am. 70, 1573–1581.
Scholz, C. H., 1968, The frequency-magnitude relation of microfracturing in rocks and its relation to earthquakes, Bull. Seismol. Soc. Am. 58, 399–415.
Schwartz. D. P. and Coppersmith, K. J., 1984, Fault behavior and characteristic earthquakes: Example from the Wasatchand and the San Andreas fault zones, J. Geophys. Res. 89, 5681–5698.
Tsapanos, T. M., 1988, The seismicity of Greece in comparison with the seismicity of other seismogenic countries of the world, Proc. 1st Symp. on Recent Trends in Seismology and Applied Geophysics, Thessaloniki 1–3 July 1988, 186–193.
Tsapanos, T.M., 1990, b-Values of two tectonic parts in the circum-Pacific belt, Pageoph, 134, 229–242.
Tsapanos, T. M. and Burton, P.W., 1991, Seismic hazard evaluation for specific seismic regions of the world, Tectonophysics 194, 153–169.
Tsapanos, T. M., Scordilis, E. M. and Papazachos, B. C., 1990, A global catalogue of strong (M⪰5.5) earthquakes during the time period 1897–1985, Publ. Geophys. Lab., Univ. of Thessaloniki 10, 90 pp.
Wang, J. H., 1988, b-Values of shallow earthquakes in Taiwan, Bull. Seismol. Soc. Am. 78, 1243–1254.
Yegulalp, J. M. and Kuo, J. T., 1974, Statistical prediction of the occurrence of maximum magnitude earthquakes, Bull. Seismol. Soc. Am. 64, 393–414.
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Tsapanos, T.M., Papazachos, B.C. Geographical and vertical variation of the earth's seismicity. Journal of Seismology 2, 183–192 (1998). https://doi.org/10.1023/A:1009779613039
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DOI: https://doi.org/10.1023/A:1009779613039