The geometry of the Wadati–Benioff zone and lithospheric kinematics in the Hellenic arc

Papazachos, B. C.; Karakostas, V.; Papazachos, C. B.; Scordilis, E. M.

doi:10.1016/s0040-1951(99)00299-1

Cited by 243 publications

(189 citation statements)

References 32 publications

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“…A well-developed Benioff zone was identified by seismicity to a depth of 150-180 km below the central Aegean (e.g. Papazachos, 1973;Makropoulos and Burton, 1981;Papadopoulos et al, 1986;Knapmeyer, 1999;Papazachos et al, 2000) and the subducting lithosphere can be followed down to about 1200 km by seismic tomography (e.g. Spakman et al, 1988;Bijwaard and Spakman, 1998).…”

Section: Introductionmentioning

confidence: 99%

“…The hypocenters form an amphitheatrically shape of the Benioff zone in first order approximation (see e.g. Bath, 1983;Engdahl et al, 1998;Knapmeyer, 1999;Papazachos et al, 2000) and thus the trend of the steepest descent of the dipping slab significantly varies along the Hellenic arc. In contrast, the GPS horizontal velocities in this region as determined by McClusky et al (2000) show only minor variation in trend (up to 18°) and magnitude (in the order of mm/a).…”

Section: Introductionmentioning

confidence: 99%

“…Several authors have analysed the stress field at the Hellenic subduction zone mainly based on fault trends and outcropping faults (e.g. Angelier et al, 1982;Meulenkamp et al, 1988;Ten Veen and Kleinspehn, 2003) or analysis of large earthquakes (Taymaz et al, 1990;Papazachos et al, 2000). In this study, we analyse fault mechanisms for earthquakes covering a broad magnitude range along the Hellenic arc in the vicinity of Crete.…”

Section: Introductionmentioning

confidence: 99%

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Deformation and stress regimes in the Hellenic subduction zone from focal Mechanisms

2005

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Fault plane solutions for earthquakes in the central Hellenic arc are analysed to determine the deformation and stress regimes in the Hellenic subduction zone in the vicinity of Crete. Fault mechanisms for earthquakes recorded by various networks or contained in global catalogues are collected. In addition, 34 fault plane solutions are determined for events recorded by our own local temporary network on central Crete in [2000][2001]. The entire data set of 264 source mechanisms is examined for types of faulting and spatial clustering of mechanisms. Eight regions with significantly varying characteristic types of faulting are identified of which the upper (Aegean) plate includes four. Three regions contain interplate seismicity along the Hellenic arc from west to east and all events below are identified to occur within the subducting African lithosphere. We perform stress tensor inversion to each of the subsets in order to determine the stress field. Results indicate a uniform N-NNE direction of relative plate motion between the Ionian Sea and Rhodes resulting in orthogonal convergence in the western forearc and oblique (40-50°) subduction in the eastern forearc. There, the plate boundary migrates towards the SE resulting in left-lateral strike-slip faulting that extends to onshore Eastern Crete. N110°E trending normal faulting in the Aegean plate at this part is in accordance with this model. Along-arc extension is observed on Western Crete. Fault plane solutions for earthquakes within the dipping African lithosphere indicate that slab pull is the dominant force within the subduction process and interpreted to be responsible for the roll-back of the Hellenic subduction zone.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Deformation and stress regimes in the Hellenic subduction zone from focal Mechanisms

2005

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“…2) was generated by a thrust fault striking NWeSE; the seismic fault is located at a relatively small depth at the early stage of the formation of the Wadati-Benioff zone Comninakis, 1970, 1971;Papazachos et al, 2000), which is propagating at bigger depths to the NE. This fault belongs to the thrust-faulting zone described above and is actually a part of the seismogenic fault of the strong earthquake of 365 AD.…”

Section: The European Radio Networkmentioning

confidence: 99%

The LF radio anomaly observed before the M w = 6.5 earthquake in Crete on October 12, 2013

Maggipinto

Biagi

Colella

et al. 2015

Physics and Chemistry of the Earth, Parts A/B/C

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a b s t r a c tOn October 12, 2013, an earthquake with M w ¼ 6.5 occurred in the southern Hellenic Arc, approximately 20 km off the west coast of Crete. The main shock, the focal depth of which is on the order of 40 km, was followed by aftershocks felt in the nearby cities and villages, although the aftershock sequence was poor. The epicentre was located at approximately 60 km from a radio receiver in Crete (CRE), which belongs to the European VLF/LF Radio Network. Several days before the earthquake, a clear disturbance occurred in one of the ten radio signals that the CRE receiver sampled. The disturbance, which can be considered an anomaly, appeared in the 216 kHz radio signal radiated by the Radio Monte Carlo (MCO) transmitter. The radio path MCO-CRE crossed directly over the epicentre area of the aforementioned earthquake. In this work, we present a detailed analysis of the MCO signal anomaly using spectral tools. We also investigate the behaviour of other radio signals sampled by the CRE receiver and consider other possible causes of disturbances on the MCO radio signal. We conclude that the disturbance in the MCO radio signal is a convincingly possible precursor of the earthquake in Crete. Emission of electromagnetic waves with a frequency band that includes 216 kHz from the focal zone of the earthquake can provide a satisfactory explanation of the radio anomaly.

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“…A well-developed Benioff zone has been identified (e.g. Papazachos et al, 2000), with medium-to-large transpressional intermediate-depth events, mainly occurring in the depth range of 60-90km, with maximum depths of the order of 180km. The subduction is associated with the generation of volcanic activity along the Hellenic volcanic arc in southern Aegean (Fytikas et al, 1985), with the volcanic centre of Santorini in Central Cyclades, being the most active volcano of the area.…”

Section: Introductionmentioning

confidence: 99%

Re-examining the stress field of the broader southern Aegean subduction area using an updated focal mechanism database

Kkallas¹,

Papazachos²,

Scordilis³

et al. 2017

geosociety

Self Cite

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We have employed the data of EGELADOS temporary network (October 2005-April 2007) to determine 88 focal mechanism solutions from Southern Aegean Sea using the RAPIDINV algorithm (Cesca et al., 2010). The new focal mechanism solutions determined, complemented with the previously available ones for Southern Aegean Seα provide the basis for a detailed examination of the stress field, using the distribution of P and T axes. To obtain the stress field we applied the method of Gephart and Forsyth (1984), namely the grid search inversion approach of Gephart (1990a,b), which incorporates the P and T axes of selected focal mechanisms. For the inversion, the initial stress solutions were computed by the “average” kinematic P and T-axis approach of Papazachos and Kiratzi (1992). The stress-inversion allows choosing the "ideal" fault plane corresponding to the minimum misfit rotation about an axis of general orientation which is needed to match an observed fault plane/slip direction with one consistent with the final stress model.

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The geometry of the Wadati–Benioff zone and lithospheric kinematics in the Hellenic arc

Cited by 243 publications

References 32 publications

Deformation and stress regimes in the Hellenic subduction zone from focal Mechanisms

Deformation and stress regimes in the Hellenic subduction zone from focal Mechanisms

The LF radio anomaly observed before the M w = 6.5 earthquake in Crete on October 12, 2013

Re-examining the stress field of the broader southern Aegean subduction area using an updated focal mechanism database

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