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

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Presentation transcript:

Seismological Evidences for Slab Geometry beneath Eastern Mediterranean Sea Ge Feb, 20th

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

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

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

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

Global Travel Time Tomography Pioneer Wim Spakman 1998, EGU

Bijwaard et. al., 1998, JGR 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 Jolivet, 2010, IJG 1200km

Wortel&Spakman, 2000, Science I J Bijwaard&Spakman, 2000, GJI Non-linear inversion Hellenic Slab SouthNorth Hellenic Trench

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

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

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

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

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

Zhu et. al, 2012, NatGeo Waveform Tomography

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

Analogue Lab Experiment Scaling: 1cm -> 70km 1hr -> 1Ma 4.4 mm/hr -> 2.5 cm/yr Slab broke at about 18hr

Faccenna et. al EPSL Resolution of tomography Resolution of Tomography

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

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

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?