Earthquake generation in Cyprus revealed by the evolving stress field

Abstract Strong earthquake occurrence (M ≥ 6.0) onshore and offshore the Cyprus Island constitutes significant seismic hazard because they occur close to populated areas. Seismicity is weak south of the Island along the Cyprean Arc and strong events are aligned along the Paphos transform fault and Larnaka thrust fault zone that were already known and the Lemessos thrust fault zone that defined in the present study. By combining the past history of strong (M ≥ 6.0) events and the long-term tectonic loading on these major fault zones, the evolution of the stress field from 1896 until the present is derived. Although uncertainties exist in the location, magnitude and fault geometries of the early earthquakes included in our stress evolutionary model, the resulting stress field provides an explanation of later earthquake triggering. It was evidenced that the locations of all the strong events were preceded by a static stress change that encouraged failure. The current state of the evolved stress field may provide evidence for the future seismic hazard. Areas of positive static stress changes were identified in the southwestern offshore area that can be considered as possible sites of future seismic activity.

[1]  J. Mercier,et al.  Comparison between deformation deduced from the analysis of recent faults and from focal mechanisms of earthquakes (An example: The Paphos region, Cyprus) , 1973 .

[2]  Richard G. Gordon,et al.  Current plate motions , 1990 .

[3]  Z. Ben‐Avraham,et al.  Plate convergence in the Cyprean Arc , 1988 .

[4]  A. Pınar,et al.  Source processes and seismotectonic implications of the 1995 and 1996 Cyprus, Eastern Mediterranean region, earthquakes , 1999 .

[5]  A. Robertson.  Tectonic significance of the Eratosthenes Seamount: a continental fragment in the process of collision with a subduction zone in the eastern Mediterranean (Ocean Drilling Program Leg 160) , 1998 .

[6]  L. Sykes,et al.  Evolution of the stress field in southern California and triggering of moderate-size earthquakes: A 200-year perspective , 1997 .

[7]  B. Papazachos,et al.  Seismicity of the Eastern Mediterranean and Some Tectonic Features of the Mediterranean Ridge , 1972 .

[8]  Massimo Cocco,et al.  Fault interaction by elastic stress changes: New clues from earthquake sequences , 2001 .

[9]  D. R. Davies,et al.  Crystallographic Studies of a Human Immunoglobulin , 1968, Nature.

[10]  A. Robertson,et al.  Seismostratigraphy and Neogene-Recent depositional history of the south central continental margin of Cyprus , 1993 .

[11]  A. Nur,et al.  The Eastern Mediterranean and the levant: Tectonics of continental collision , 1978 .

[12]  Z. Garfunkel.  Constrains on the origin and history of the Eastern Mediterranean basin , 1998 .

[13]  R. Simpson,et al.  In the shadow of 1857‐the effect of the Great Ft. Tejon Earthquake on subsequent earthquakes in southern California , 1996 .

[14]  E. Papadimitriou.  Mode of Strong Earthquake Recurrence in the Central Ionian Islands (Greece): Possible Triggering due to Coulomb Stress Changes Generated by the Occurrence of Previous Strong Shocks , 2002 .

[15]  A. Hofstetter,et al.  Seismotectonics of the Sinai subplate – the eastern Mediterranean region , 2003 .

[16]  A. Hofstetter,et al.  Seismicity of the eastern Mediterranean region: Perspective from the Sinai subplate , 1996 .

[17]  G. King,et al.  Stress coupling between earthquakes in northwest Turkey and the north Aegean Sea , 1996 .

[18]  K. Priestley,et al.  The 1996 Cyprus earthquake: a large, deep event in the Cyprean Arc , 2004 .

[19]  A. Robertson,et al.  The Miocene Pakhna Formation, southern Cyprus and its relationship to the Neogene tectonic evolution of the Eastern Mediterranean , 1993 .

[20]  Walter H. F. Smith,et al.  New, improved version of generic mapping tools released , 1998 .

[21]  W. Ryan,et al.  Plate Tectonics and the Evolution of the Alpine System , 1973 .

[22]  N. N. Ambraseys,et al.  Reassessment of earthquakes, 1900–1999, in the Eastern Mediterranean and the Middle East , 2001 .

[23]  S. Wdowinski,et al.  Plate tectonic framework for the October 9, 1996, Cyprus Earthquake , 1998 .

[24]  G. Anastasakis,et al.  Tectonic connection of the Hellenic and Cyprus arcs and related geotectonic elements , 1991 .

[25]  C. Scholz.  The Mechanics of Earthquakes and Faulting , 1990 .

[26]  G. Vargemezis,et al.  The 2001 Skyros, Northern Aegean, Greece, earthquake sequence: off ‐ fault aftershocks, tectonic implications, and seismicity triggering , 2003 .

[27]  D. Klaeschen,et al.  The structure of the Africa‐Anatolia plate boundary in the eastern Mediterranean , 2000 .

[28]  A. Gilbert Smith.  Alpine Deformation and the Oceanic Areas of the Tethys, Mediterranean, and Atlantic , 1971 .

[29]  J. Steketee.  ON VOLTERRA'S DISLOCATIONS IN A SEMI-INFINITE ELASTIC MEDIUM , 1958 .

[30]  Richard G. Gordon,et al.  Closure of the Africa‐Eurasia‐North America Plate motion circuit and tectonics of the Gloria Fault , 1989 .

[31]  A. Behle,et al.  Seismic refraction profiles between Cyprus and Israel and their interpretation , 1983 .

[32]  N. N. Ambraseys,et al.  Seismicity of the Cyprus region , 1993 .

[33]  D. McKenzie.  Active Tectonics of the Mediterranean Region , 1972 .

[34]  B. C. Papazachos,et al.  Lithospheric boundaries and plate motions in the Cyprus area , 1999 .

[35]  J. Jackson,et al.  A comparison of satellite laser ranging and seismicity data in the Aegean Region , 1994 .

[36]  James Jackson,et al.  The relationship between plate motions and seismic moment tensors, and the rates of active deformation in the Mediterranean and Middle East , 1988 .

[37]  F. Amelung,et al.  Block versus continuum deformation in the Western United States , 1994 .

[38]  G. King,et al.  STATIC STRESS CHANGES AND THE TRIGGERING OF EARTHQUAKES , 1994 .

[39]  Eleftheria Papadimitriou,et al.  Evolution of the stress field in the northern Aegean Sea (Greece) , 2001 .

[40]  Ruth A. Harris,et al.  Introduction to Special Section: Stress Triggers, Stress Shadows, and Implications for Seismic Hazard , 1998 .

[41]  Simon McClusky,et al.  GPS constraints on Africa (Nubia) and Arabia plate motions , 2003 .

[42]  D. McKenzie,et al.  Plate Tectonics of the Mediterranean Region , 1970, Nature.

[43]  B. C. Papazachos,et al.  GLOBAL RELATIONS BETWEEN SEISMIC FAULT PARAMETERS AND MOMENT MAGNITUDE OF EARTHQUAKES , 2004 .

[44]  R. Stein.  The role of stress transfer in earthquake occurrence , 1999, Nature.

[45]  D. Wells,et al.  New empirical relationships among magnitude, rupture length, rupture width, rupture area, and surface displacement , 1994, Bulletin of the Seismological Society of America.

[46]  Y. Okada.  Internal deformation due to shear and tensile faults in a half-space , 1992, Bulletin of the Seismological Society of America.