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Seismological Evidences for Slab Geometry beneath Eastern Mediterranean Sea

Seismological Evidences for Slab Geometry beneath Eastern Mediterranean Sea . Ge277-2013 Feb, 20th. Tectonic Background. Three slab detachments. Indentation. Rolling back of Hellenic Trench. Faccenna et. al. 2006 EPSL. Wortel&Spakman , 2000, Science. Slab and Benioff -zone.

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Seismological Evidences for Slab Geometry beneath Eastern Mediterranean Sea

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  1. Seismological Evidences for Slab Geometry beneath Eastern Mediterranean Sea Ge277-2013 Feb, 20th

  2. Tectonic Background Three slab detachments Indentation Rolling back of Hellenic Trench Faccenna et. al. 2006 EPSL Wortel&Spakman, 2000, Science

  3. Slab and Benioff-zone Catalog: 1956~1995 Papazachos et. al, 2000, Tectonophysics

  4. NEIC Catalog: 1973 ~ 2013 Slab Geometry and Seismicity Depth > 30km Papazachos et. al, 2000, Tectonophysics What is the relationship between slab detachment and seismicity depth?

  5. Tomography 1, Travel time tomography 2, Waveform Tomography More waveform information is used but usually rely on good initial model Solving a linearized equation Need a reference model

  6. Global Travel Time Tomography Pioneer WimSpakman 1998, EGU

  7. P-wave travel time tomography (Global) 5, 000, 000 P, pP, pwP waves picks were used (1964 ~ 1995) Grid size: 0.6*0.6 degree for upper mantle 1200km Jolivet, 2010, IJG Bijwaard et. al., 1998, JGR

  8. Hellenic Slab J Hellenic Trench I South North Bijwaard&Spakman, 2000, GJI Wortel&Spakman, 2000, Science Non-linear inversion

  9. Calabria Slab F E East West Bijwaard&Spakman, 2000, GJI Wortel&Spakman, 2000, Science

  10. Carpathians Slab G H East West Bijwaard&Spakman, 2000, GJI Wortel&Spakman, 2000, Science

  11. On going detachment of Hellenic Slab N S Cyprus Bijwaard et. al., 1998, JGR Amaru 2007, GeolUltraiect  17.7 million P-wave picks, 3D reference model Resolution for P-wave: 0.8 degree Hinsbergen, 2010, EPSL

  12. Regional Model 1, P-wave travel time 2, Catalog 1964-1995 3, Relocated hypocenter 4, 52,000 arrivals 5, Mantle correction 1, Asthenosphere More regional data than global study Grid size: 0.5*0.5 degree in Mediterranean 2, Slab remnants Faccenna et. al. 2006 EPSL

  13. Waveform Tomography 26, 581 three component waveform data Body wave: 15~50s Surface Wave: 50~150s Zhu et. al, 2012, NatGeo

  14. Waveform Tomography Zhu et. al, 2012, NatGeo

  15. Slab Detachment Wortel&Spakman, 2000, Science Faccenna et. al. 2006, EPSL

  16. Analogue Lab Experiment Scaling: 1cm -> 70km 1hr -> 1Ma 4.4 mm/hr -> 2.5 cm/yr Slab broke at about 18hr Faccenna et. al. 2006, EPSL

  17. Resolution of tomography Resolution of Tomography Faccenna et. al. 2006 EPSL

  18. Conclusion • Seismicity and tomography results indicate the slab break off beneath Cyprus Arc.

  19. Transpression Transtension 2Ma ~ now 12~2 Ma 20~12 Ma Faccenna et. al. 2006 EPSL

  20. Questions • 1, When and where did the slab break off? (evidence) • 2, Is there any relationship between slab break off and the acceleration of retreat of the Hellenic trench? • 3, What is the relationship between the indentations, the westward motion on NAF and slab break off?

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