Observation of the spread of slow deformation in Greece following the breakup of the slab

Durand, Virginie; Bouchon, Micheĺ; Floyd, Michael; Theodulidis, N.; Marsan, David; Karabulut, Hayrullah; Schmittbuhl, Jean

doi:10.1002/2014gl061408

Cited by 18 publications

(17 citation statements)

References 30 publications

(54 reference statements)

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“…Durand et al . [] suggested a mechanical interaction between the lower and upper plate to explain this 2008 earthquakes sequence. Here we may provide structural elements for a link in space in addition to time.…”

Section: Resultsmentioning

confidence: 99%

“…They have been followed by a NNE right-lateral upper plate event (Achaia-Movri Mw 6.4 8 June 2008) in NW Peloponnesus (Figure 3). Durand et al [2014] suggested a mechanical interaction between the lower and upper plate to explain this 2008 earthquakes sequence. Here we may provide structural elements for a link in space in addition to time.…”

Section: Hypothesis Of Mechanical Coupling Between the Two Platesmentioning

confidence: 94%

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Segmented Hellenic slab rollback driving Aegean deformation and seismicity

Sachpazi

Laigle

Charalampakis

et al. 2016

Geophysical Research Letters

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The NE dipping slab of the Hellenic subduction is imaged in unprecedented detail using teleseismic receiver function analysis on a dense 2‐D seismic array. Mapping of slab geometry for over 300 km along strike and down to 100 km depth reveals a segmentation into dipping panels by along‐dip faults. Resolved intermediate‐depth seismicity commonly attributed to dehydration embrittlement is shown to be clustered along these faults. Large earthquakes occurrence within the upper and lower plate and at the interplate megathrust boundary show a striking correlation with the slab faults suggesting high mechanical coupling between the two plates. Our results imply that the general slab rollback occurs here in a differential piecewise manner imposing its specific stress and deformation pattern onto the overriding Aegean plate.

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Section: Resultsmentioning

confidence: 99%

Section: Hypothesis Of Mechanical Coupling Between the Two Platesmentioning

confidence: 94%

Segmented Hellenic slab rollback driving Aegean deformation and seismicity

Sachpazi

Laigle

Charalampakis

et al. 2016

Geophysical Research Letters

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“…In general, subduction‐related earthquakes are thought to result from two main causes in the WHSZ. The slab breaking up, plunging downward, rolling back, and slipping along the interface with the overriding plate (Durand et al, ; Papazachos et al, ). This sequence of earthquakes includes normal faulting in the slab and thrust faulting along the interface, with both types of faulting occurring in the direction of subduction. Compression parallel to the trench due to the convex shape of the slab, which results in arc‐parallel thrusting (Benetatos et al, ; Rontogianni et al, ). …”

Section: Geodynamic Settingmentioning

confidence: 99%

“…1. The slab breaking up, plunging downward, rolling back, and slipping along the interface with the overriding plate (Durand et al, 2014;Papazachos et al, 2000). This sequence of earthquakes includes normal faulting in the slab and thrust faulting along the interface, with both types of faulting occurring in the direction of subduction.…”

Section: Slab Seismicitymentioning

confidence: 99%

Seismicity, Deformation, and Metamorphism in the Western Hellenic Subduction Zone: New Constraints From Tomography

2018

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The Western Hellenic Subduction Zone is characterized by a transition from oceanic to continental subduction. In the southern oceanic portion of the system, abundant seismicity reaches depths of 100 km to 190 km, while the northern continental portion rarely exhibits deep earthquakes. Our study investigates how this oceanic‐continental transition affects fluid release and related seismicity along strike. We present results from local earthquake tomography and double‐difference relocation in conjunction with published images based on scattered teleseismic waves. Our tomographic images recover both subducting oceanic and continental crusts as low‐velocity layers on top of high‐velocity mantle. Although the northern and southern trenches are offset along the Kephalonia Transform Fault, continental and oceanic subducting crusts appear to align at depth. This suggests a smooth transition between slab retreat in the south and slab convergence in the north. Relocated hypocenters outline a single‐planed Wadati‐Benioff Zone with significant along‐strike variability in the south. Seismicity terminates abruptly north of the Kephalonia Transform Fault, likely reflecting the transition from oceanic to continental subducted crust. Near 90 km depth, the low‐velocity signature of the subducting crust fades out and the Wadati‐Benioff Zone thins and steepens, marking the outline of the basalt‐eclogite transition. Subarc melting of the mantle is only observed in the southernmost sector of the oceanic subduction, below the volcanic part of the arc. Beneath the nonvolcanic part, the overriding crust appears to have undergone large‐scale silica enrichment. This enrichment is observed as an anomalously low Vp/Vs ratio and requires massive transport of dehydration‐derived fluids updip through the subducting crust.

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“…Stiros et al 2013;Serpetsidaki et al 2014). Durand et al (2014) suggest that earthquakes with M W ≥5.0 in Greece during 2008 followed an approximately SW-NE progression related to the spread of seismicity following an earthquake in the downgoing Nubian lithosphere on 2008 January 6 (L1, Fig. 3).…”

Section: T H E 0 0 8 M E T H O N I E a Rt H Q Ua K E S E Q U E N C Ementioning

confidence: 99%

The 2008 Methoni earthquake sequence: the relationship between the earthquake cycle on the subduction interface and coastal uplift in SW Greece

Howell¹,

Palamartchouk

Papanikolaou

et al. 2016

Geophys. J. Int.

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S U M M A R YSeismological, GPS and historical data suggest that most of the 40 mm yr −1 convergence at the Hellenic Subduction Zone is accommodated through aseismic creep, with earthquakes of M W 7 rupturing isolated locked patches of the subduction interface. The size and location of these locked patches are poorly constrained despite their importance for assessment of seismic hazard. We present continuous GPS time-series covering the 2008 M W 6.9 Methoni earthquake, the largest earthquake on the subduction interface since 1960. Post-seismic displacements from this earthquake at onshore GPS sites are comparable in magnitude with the coseismic displacements; elastic-dislocation modelling shows that they are consistent with afterslip on the subduction interface, suggesting that much of this part of the interface is able to slip aseismically and is not locked and accumulating elastic strain. In the Hellenic and other subduction zones, the relationship between earthquakes on the subduction interface and observed long-term coastal uplift is poorly understood. We use cGPS-measured coseismic offsets and seismological body-waveform modelling to constrain centroid locations and depths for the 2008 Methoni M W 6.9 and 2013 Crete M W 6.5 earthquakes, showing that the subduction interface reaches the base of the seismogenic layer SW of the coast of Greece. These earthquakes caused subsidence of the coast in regions where the presence of Pliocene-Quaternary marine terraces indicates recent uplift, so we conclude that deformation associated with the earthquake cycle on the subduction interface is not the dominant control on vertical motions of the coastline. It is likely that minor uplift on a short length scale (∼15 km) occurs in the footwalls of normal faults. We suggest, however, that most of the observed Plio-Quaternary coastal uplift in SW Greece is the result of thickening of the overriding crust of the Aegean by reverse faulting or distributed shortening in the accretionary wedge, by underplating of sediment of the Mediterranean seafloor, or a combination of these mechanisms.

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Observation of the spread of slow deformation in Greece following the breakup of the slab

Cited by 18 publications

References 30 publications

Segmented Hellenic slab rollback driving Aegean deformation and seismicity

Segmented Hellenic slab rollback driving Aegean deformation and seismicity

Seismicity, Deformation, and Metamorphism in the Western Hellenic Subduction Zone: New Constraints From Tomography

The 2008 Methoni earthquake sequence: the relationship between the earthquake cycle on the subduction interface and coastal uplift in SW Greece

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