A 3-D density–velocity model between the Cretan Sea and Libya

Makris, J.; Yegorova, Tamara

doi:10.1016/j.tecto.2005.11.003

Cited by 41 publications

(36 citation statements)

References 33 publications

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“…The 1994 program of western Greece was supported by the Public Petroleum Corporation of Greece (PPC). Results have been partially published by Makris and Chonia 2000, Bonhofff et al 2001, Makris and Yegorova 2006 and Papoulia and Makris this volume. The projects were funded by the Deutsche Forschungsgemeinschaft, the EU, and the Public Petroleum Cop.…”

Section: Active Seismic Experiments For Crustal Studiesmentioning

confidence: 91%

“…Crete was resurveyed in 1999 and 1998 by establishing 2000 gravity and magnetic stations on the Island by the universities of Hamburg and Bochum. For a discussion of the gravity surveys and their accuracy see Makris and Yegorova 2006and Makris et al 1973.…”

Section: Gravity Data and Gravity Maps Of Greecementioning

confidence: 99%

“…Velocities define the density values using the empirical functions between velocity and density published by Birch (1960 and1961) and Nafe and Drake (1973). A detailed report on the computation of the 3-D density-velocity model of southern Greece and the Libyan Sea is published by Makris and Yegorova (2006) and a second covering all the country is in preparation by Makris, Yegorova, Papoulia, (2010).…”

Section: A Qualitative Description Of the Bouguer Gravity Field And Amentioning

confidence: 99%

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Geophysical Studies and Tectonism of the Hellenides

Makris¹

2017

geosociety

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Section: Active Seismic Experiments For Crustal Studiesmentioning

confidence: 91%

Section: Gravity Data and Gravity Maps Of Greecementioning

confidence: 99%

Section: A Qualitative Description Of the Bouguer Gravity Field And Amentioning

confidence: 99%

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Geophysical Studies and Tectonism of the Hellenides

Makris¹

2017

geosociety

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“…The slab hingeline is approximately located beneath the so-called Hellenic Trench. Further northeast, in the Peloponnese and Crete, the slab begins to dip beneath the Aegean Plate with an angle of about 20 • , as imaged by seismic lines (Bohnhoff et al, 2001), receiver functions analysis (Meier et al, 2007) and results from combined seismic techniques models (Meier et al, 2004) or velocity-gravity models (Casten and Snopek, 2006;Makris and Yegorova, 2006). The slab retains a shallow angle until a depth of at least 120 km as revealed by tomographic images of P-and Svelocity variations (Papazachos and Nolet, 1997;Li et al, 2003;Suckale et al, 2009;Pearce et al, 2012).…”

Section: Subduction Fault Source (Type 1)mentioning

confidence: 98%

“…The African oceanic crust in the central Mediterranean is mostly covered by the deformed sediments of the accretionary wedge and lies as deep as 16 km (Makris and Yegorova, 2006). The slab hingeline is approximately located beneath the so-called Hellenic Trench.…”

Section: Subduction Fault Source (Type 1)mentioning

confidence: 99%

Integrating geologic fault data into tsunami hazard studies

Basili

Tiberti

Kastelic

et al. 2013

Nat. Hazards Earth Syst. Sci.

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We present the realization of a fault-source data set designed to become the starting point in regional-scale tsunami hazard studies. Our approach focuses on the parametric fault characterization in terms of geometry, kinematics, and assessment of activity rates, and includes a systematic classification in six justification levels of epistemic uncertainty related with the existence and behaviour of fault sources. We set up a case study in the central Mediterranean Sea, an area at the intersection of the European, African, and Aegean plates, characterized by a complex and debated tectonic structure and where several tsunamis occurred in the past. Using tsunami scenarios of maximum wave height due to crustal earthquakes (M_w=7) and subduction earthquakes (M_w=7 and M_w=8), we illustrate first-order consequences of critical choices in addressing the seismogenic and tsunamigenic potentials of fault sources. Although tsunamis generated by M_w=8 earthquakes predictably affect the entire basin, the impact of tsunamis generated by M_w=7 earthquakes on either crustal or subduction fault sources can still be strong at many locales. Such scenarios show how the relative location/orientation of faults with respect to target coastlines coupled with bathymetric features suggest avoiding the preselection of fault sources without addressing their possible impact onto hazard analysis results

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Crustal Thickness Beneath Libya and the Origin of Partial Melt Beneath AS Sawda Volcanic Province From Receiver Function Constraints

et al. 2017

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This study investigates crustal thickness and properties within the Libyan region. Results obtained from 15 seismic stations belonging to the Libyan Center for Remote Sensing and Space Science are reported, in addition to 3 seismic stations publically available, using receiver functions. The results show crustal thicknesses ranging from 24 km to 36 km (with uncertainties ranging between ±0.10 km and ±0.90 km). More specifically, crustal thickness ranges from 32 km to 36 km in the southern portion of the Libyan territory then becomes thinner, between 24 km and 30 km, in the coastal areas of Libya and thinnest, between 24 km and 28 km, in the Sirt Basin. The observed high Vp/Vs value of 1.91 at one station located at the AS Sawda Volcanic Province in central Libya indicates the presence of either partial melt or an abnormally warm area. This finding suggests that magma reservoirs beneath the Libyan territory may still be partially molten and active, thereby posing significant earthquake and volcanic risks. The hypothesis of an active magma source is further demonstrated though the presence of asthenospheric upwelling and extension of the Sirt Basin. This study provides a new calculation of unconsolidated sediment layers by using the arrival time of the P to S converted phases. The results show sediments thicknesses of 0.4 km to 3.7 km, with the Vp/Vs values ranging from 2.2 to 4.8. The variations in crustal thickness throughout the region are correlated with surface elevation and Bouguer gravity anomalies, which suggest that they are isostatically compensated.

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A 3-D density–velocity model between the Cretan Sea and Libya

Cited by 41 publications

References 33 publications

Geophysical Studies and Tectonism of the Hellenides

Geophysical Studies and Tectonism of the Hellenides

Integrating geologic fault data into tsunami hazard studies

Crustal Thickness Beneath Libya and the Origin of Partial Melt Beneath AS Sawda Volcanic Province From Receiver Function Constraints

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