pure and applied geophysics

, Volume 115, Issue 3, pp 655–666 | Cite as

A lithospheric model to interpret focal properties of intermediate and shallow shocks in central greece

  • B. C. Papazachos


An attempt has been made to interpret the striking difference, in focal properties, between the intermediate and shallow earthquakes in Central Greece and an observed time sequence of these shocks by a lithospheric model. This model consists of a lithospheric slab descending from the Ionian to the Aegean and a back-arc expanding Aegean lithosphere. Thrust faulting near the top surface of the slab, caused by the sinking of the slab, triggers spreading and normal faulting in the back-arc Aegean region.

Key words

Seismology Greece Plate tectonics Focal mechanism 


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  1. Caputo, M. G., Panza, F. andPostpischl, D. (1970),Deep structure of the Mediterranean basin, J. Geophys. Res.75, 4919–4923.Google Scholar
  2. Delibasis, N. (1968),Focal mechanism of the intermediate earthquakes in the area of Greece and their intensity distribution (in Greek) Sci. D. Thesis, Univ. of Athens. Athens, Greece, 105 pp.Google Scholar
  3. Galanopoulos, A. G. (1973),Plate tectonics in the area of Greece as reflected in the deep focus seismicity, Ann. di Geofisica,26, 86–105.Google Scholar
  4. Iscks, B., Oliver, J. andSykes, L. R. (1968),Seismology and new grobal tectonics, J. Geophys. Res.73, 5855–5899.Google Scholar
  5. Isacks, B. andMolnar, P. (1971),Distribution of stresses in the descending lithosphere from a global surve of focal-mechanism solutions of mantle earthquakes, Rev. Geophys. Space Phys.9, 103–174.Google Scholar
  6. Karig, D. E. (1971),Origin and development of marginal basins in the Western Pacific, J. Geophys. Res.76, 2542–2561.Google Scholar
  7. Karnik, V. (1972),A note on the morphology and activity of seismic zones in the Aegean region, Nature,239, 72–73.Google Scholar
  8. Leydecker, G., Delibasis, N. andBerckhemer, H. (1975),Hypocenter distribution and tectonics in the Peloponnesus region, Proc. 14th Gen. Ass. ESC, Akad. Wiss. DDR, Nat. Com. Geod. Geophys., Berlin, 379–384.Google Scholar
  9. McKenzie, D. P. (1972),Active tectonics in the Mediterranean region, Geophys. J. Roy. Astr. Soc.30, 109–185.Google Scholar
  10. Molnar, P. andOliver, J. (1969),Lateral variations of attentuation in the upper mantle and discontinuities in the lithosphere, J. Geophys. Res.74, 2648–2682.Google Scholar
  11. Oxburgh, E. R. andTurcott, D. L. (1971),Origin of paired metamorphic belts and crustal dilation in Island Arc regions, J. Geophys. Res.76, 1315–1327.Google Scholar
  12. Papazachos, B. C. andComninakis, P. E. (1970),Geophysical features of the Greek Island Arc and of the Eastern Mediterranean ridge, C. R. Acad. Sci. Paris16, 74.Google Scholar
  13. Papazachos, B. C. andComninakis, P. E. (1971),Geophysical and tectonic features of the Aegean arc, J. Geophys. Res.76, 8517–8533.Google Scholar
  14. Papazachos, B. C. (1973),Distribution of seismic foci in the Mediterranean and surrounding area and its tectonic implication, Geophys. J. Roy. Astr. Soc.33, 421–430.Google Scholar
  15. Papazachos, B. C. (1975a),Intesity distribution of the 4 April 1975 earthquake in Achaia, Greece, Monthly Bull. Seism. Inst. Nation. Obs. Athens April 1975, 1–14.Google Scholar
  16. Papazachos, B. C. (1975b),Seismic activity along the Patras-Corinth-Saronikos Gulfs, Monthly Bull. Seism. Inst. Nation. Obs. Athens December 1975, 1–16.Google Scholar
  17. Papazachos, B. C. (1976),Seismotectonics of the Northern Aegean area, Tectonophysics33, 199–209.Google Scholar
  18. Papazachos, B. C. andComninakis, P. E. (1976),Modes of lithospheric interactions in the Aegean area, Proc. XXVth Congress and Plenary Assembly of CIESM, Split, 22–30 October 1976 (in press).Google Scholar
  19. Richter, C. F. (1958),Elementary seismology, W. H. Freeman, San Francisco.Google Scholar
  20. Ritsema, A. R. (1974),The earthquake mechanism of the Balkan region, Roy. Netherl. Meteorol. Instit. Scient. Report No. 74-4, 1–36.Google Scholar
  21. Ritsema, A. R. (1975),General trends of fault plane solutions in Europe, Proc. 14th Gen. Ass. ESC, Akad. Wiss. DDR, Nat. Com. Geod. Geophys., Berlin, 379–384.Google Scholar
  22. Sclater, J. G. (1972),Heat flow and elevation of the marginal basins of the Western Pacific, J. Geophys. Res.77, 5705–5719.Google Scholar
  23. Sleep, N. andToksöz, M. N. (1971),Evolution of marginal basins, Nature233, 548–550.Google Scholar
  24. Toksöz, M. N., Minear, J. W. andJulian, B. R. (1971),Temperature field and geophysical effects of a downgoing slab, J. Geophys. Res.76, 1113–1138.Google Scholar

Copyright information

© Birkhäuser Verlag 1977

Authors and Affiliations

  • B. C. Papazachos
    • 1
  1. 1.Seismological InstituteNational Observatory of AthensAthensGreece

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