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The Lefkada, Sea (Greece), shock (Mw 6.2) of 14 August 2003: Evidence for the characteristic earthquake from seismicity and ground failures

Abstract

The earthquake (Mw 6.2, Ms 6.4) of 14 August 2003 which occurred in the Lefkada segment of the Cephalonia Transform Fault, Ionian Sea (Greece), was associated with dextral strike-slip faulting striking NNE-SSW. Reevaluation of instrumental and documentary sources show that the 1914, 1948 and 2003 earthquakes ruptured the same fault segment and that all had similar size, which implies that this segment produces characteristic earthquakes. This is verified by the magnitude-frequency diagram which for the instrumental period of 1911–2003 exhibits a relatively narrow range of magnitudes near the maximum (Ms 6.4), deviation from the log linear relationship and a gap in the moderate-magnitude range. Field observations indicate that the 2003 earthquake and past strong shocks caused on Lefkada island impressively similar ground failures at exactly the same sites: extensive landslides and soil liquefaction, which signifies comparable strong motion features as an additional evidence of the characteristic earthquake. However, while the maximum seismic intensity for the 1914 and 1948 strong shocks is estimated as I max= IX t - X (MM scale), the impact of the 2003 shock was less severe (Imax= VIII) possibly due to building strengthening after 1948.

References

  • Critikos, N., L’île de Leucade et des sismes du 23 et du 27 Novembre 1914, Annales de l’Observatoire National d’ Athènes, VII, Athènes, 62–81, 1916.

  • Eginitis, D., Les tremblements de terre de Leucade et d’ Ithaque des 23 et 27 Novembre 1914 et du 27 Janvier 1915, Annales de l’Observatoire National d’Athènes, VII, Athènes, 27–32, 1916.

  • Galanopoulos, A. G., Die Seismizität der Insel Leukas, Gerl. Beitr. Geophys., 63, 1–15, 1950.

    Google Scholar 

  • Grant, L. B., Uncharacteristic earthquakes on the San Andreas Fault, Science, 272, 826–827, 1996.

    Article  Google Scholar 

  • HRV, Harvard CMT Solutions, http://www.seismology.harvard.edu/CMTsearch.html, last access 10 September 2003, http://www.gein.noa.gr, Earthquake Catalogues.

  • Kagan, Y. Y., Statistics of characteristic earthquakes, Bull. Seism. Soc. Am., 83, 7–24, 1993.

    Google Scholar 

  • Kahle, H.-G., The Kephalonia transform fault and the rotation of the Apulian platform: evidence from satellite geodesy, Geophys. Res. Lett., 20, 651–654, 1993.

    Article  Google Scholar 

  • Kahle, H.-G., M. V. Müller, A. Geiger, G. Danuser, S. Mueller, G. Veis, H. Billiris, and D. Pradissis, The strain field in northwestern Greece and the Ionian Islands: results inferred from GPS measurements, Tectonophysics, 249, 41–52, 1995.

    Article  Google Scholar 

  • Kramer, S. L., Geotechnical Earthquake Engineering, pp. 653, Prentice Hall Edit., Washington, 1996.

    Google Scholar 

  • Louvari, E., A. A. Kiratzi, and B. C. Papazachos, The Cephalonia Transform Fault and its extension to western Lefkada Island (Greece), Tectonophysics, 308, 223–236, 1999.

    Article  Google Scholar 

  • NOAGI, National Observatory of Athens, Institute of Geodynamics, http://www.gein.noa.gr, Earthquake Catalogues, 2003.

  • Papadopoulos, G. A., H. G. Skafida, and I. T. Vassiliou, Nonlinearity of the magnitude-frequency relation in the Hellenic Arc—Trench System and the characteristic earthquake model, J. Geophys. Res., 98, 17,737–17,744, 1993.

    Article  Google Scholar 

  • Papadopoulos, G. A., K. Konstantinou, and A. Fokaefs, Empirical relationships between magnitude and aftershock area dimensions for Mediterranean region earthquakes, 2003 (submitted).

  • Papazachos, B. and P. Comninakis, Geophysical and tectonic features of the Aegean arc, J. Geophys. Res., 76, 8517–8533, 1971.

    Article  Google Scholar 

  • Papazachos, B. C. and C. B. Papazachou, The Earthquakes of Greece, pp. 304, Ziti Edit., Thessaloniki, 1997.

    Google Scholar 

  • Pavlides, S., G. Papathanasiou, A. Ganas, G. A. Papadopoulos, V. Karastathis, and D. Keramydas, The 14 August 2003 Lefkada (Ionian Sea) Earthquake: field observations, 1st International Workshop on Earthquake Prediction, Europ. Seism. Commission, Athens, 6–7 November 2003, edited by G. A. Papadopoulos, 2: Extended Abstracts, 2003.

  • Roberts, G. P., Noncharacteristic normal faulting surface ruptures from the Gulf of Corinth, Greece, J. Geophys. Res., 101, 25,255–25,267, 1996.

    Article  Google Scholar 

  • Schwartz, D. P. and K. J. Coppersmith, Fault behavior and characteristic earthquakes: Examples from the Wasatch and San Andreas Fault Zones, J. Geophys. Res., 89, 5681–5698, 1984.

    Article  Google Scholar 

  • Schwartz, D. P., K. J. Coppersmith, F. H. Swan, P. Somerville, and W. U. Savage, Characteristic earthquakes on intraplate normal faults, Earthquake Notes, 52, 71, 1981.

    Google Scholar 

  • Silver, N. L. and H. B. Seed, Volume changes in sands during cyclic loading, J. Soil Mech. Found. Div, ASCE, 97, 1171, 1971.

    Google Scholar 

  • Thatcher, W., Order and diversity in the modes of circum-Pacific earthquake recurrence, J. Geophys. Res., 95, 2609–2623, 1990.

    Article  Google Scholar 

  • Theodulidis, N. P., Contribution to the study of strong motion in Greece, Ph.D. Thesis, Univ. Thessaloniki, pp. 500, 1991 (in Greek).

  • USGS, United States Geological Survey, National Earthquake Information Center, http://gldss7.cr.usgs.gov/neis/bulletin/bulletin.html, last access 10 September 2003.

  • Valle, P., Il terremoto Jonico del 22 Aprile 1948, Annali di Geofisica, 4, 241–245, 1951.

    Google Scholar 

  • Varnes, D. J., Slope movement types and processes, Landslides: Analysis and Control, Transportation Research Board Special Report 176, National Academy of Sciences, Washington, D.C., 12–33, 1978.

    Google Scholar 

  • Wells, D. L. and K. J. Coppersmith, New empirical relationships among magnitude, rupture length, rupture width, rupture area, and surface displacement, Bull. Seism. Soc. Am., 84, 974–1002, 1994.

    Google Scholar 

  • Wesnousky, S. G., C. H. Scholz, K. Shimazaki, and T. Matsuda, Earthquake frequency and the mechanics of faulting, J. Geophys. Res., 88, 9331–9340, 1983.

    Article  Google Scholar 

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Correspondence to Gerassimos A. Papadopoulos.

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Papadopoulos, G.A., Karastathis, V.K., Ganas, A. et al. The Lefkada, Sea (Greece), shock (Mw 6.2) of 14 August 2003: Evidence for the characteristic earthquake from seismicity and ground failures. Earth Planet Sp 55, 713–718 (2003). https://doi.org/10.1186/BF03352478

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Key words

  • Ionian Sea
  • Lefkada island
  • strike-slip faulting
  • earthquake size
  • characteristic earthquake
  • landslide
  • soil liquefaction
  • yield acceleration