New constraints from seismology and geodesy on the Mw = 6.4 2008 Movri (Greece) earthquake: evidence for a growing strike-slip fault system

Serpetsidaki, A.; Elias, Panagiotis; Ilieva, Maya; Bernard, Pascal; Briole, Pierre; Deschamps, A.; Lambotte, Sophie; Lyon‐Caen, H.; Sokos, Efthimios; Tselentis, G‐Akis

doi:10.1093/gji/ggu212

Cited by 29 publications

(23 citation statements)

References 26 publications

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“…The intermediate‐depth events (i.e., Kythira, Leonidio, and Argos events) corresponding to the release of the locally accumulated strain at the slab faults would reflect the retreat of the deeper panels toward the SSW. The Achaia‐Movri strike‐slip event located uncommonly in the lower than upper Aegean crust right above one of the slab faults (F2) has been attributed to differential shear slip on the base of the Aegean crust [ Serpetzidaki et al ., ]. This specific earthquake may highlight the accommodation of the slab deformation by the overriding upper plate.…”

Section: Resultsmentioning

confidence: 92%

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: 92%

Segmented Hellenic slab rollback driving Aegean deformation and seismicity

Sachpazi

Laigle

Charalampakis

et al. 2016

Geophysical Research Letters

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“…This suggests that while some differential plate motion offsets the trenches at Kephalonia, there is a larger force deforming the upper plate farther south. Second, according to Serpetsidaki et al (), the Movri earthquake is associated with an immature fault system with a predominantly dextral strike‐slip movement, in line with the northern end of the CHSZ. This immaturity suggests that faulting started only recently, which matches our model of a slab in which deformation has been growing since the onset of differential subduction. Third, although Serpetsidaki et al () place the Movri earthquake 50 km toward the backarc from the contact zone between overriding and subducting crusts in their model, our tomographic models suggest that the Movri event falls right into the area of thickened crust, where coupling between the crusts would be possible.…”

Section: Discussionmentioning

confidence: 99%

“…The CHSZ is home to the largest strike-slip earthquake recorded on mainland Greece-the M6.4 Movri event of 2008 (fault plane marked in red in Figures 1 and 5; Gallovič et al, 2009). This earthquake, in which the lower overriding crust below the Movri mountains ruptured (Serpetsidaki et al, 2014), was unexpected 10.1002/2017JB015154 considering the absence of any comparable event in the historical record (Gallovič et al, 2009). According to Papadopoulos et al (2010), the fault that ruptured had not been active for at least the last 300 years.…”

Section: Stress Transfer To the Lower Overriding Crustmentioning

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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“…Major earthquakes in the last~50 years in and around the Corinth rift. Focal mechanisms are from Serpetsidaki et al (2014), Sokos et al (2012), Kiratzi and Louvari (2003), Baker et al (1997), Bernard et al (1997), Braunmiller and Nábělek (1996), Hatzfeld et al (1996), Taymaz et al (1991), Liotier (1989), and Papazachos (1975). Faults traces, originally from Flotte et al (2005), were compiled during the EU project SISCOR (http://siscor.crlab.eu), using in particular Moretti et al (2003), Palyvos et al (2005), and Bell et al (2008).…”

Section: 1029/2018gc007574mentioning

confidence: 99%

Ground Deformations in the Corinth Rift, Greece, Investigated Through the Means of SAR Multitemporal Interferometry

Elias

Briole

2018

Geochem Geophys Geosyst

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The Corinth Rift is one of the narrowest and fastest extending continental regions worldwide and has one of the highest seismicity rates in the Euro‐Mediterranean region. At its western termination, several active faults are located beneath the city of Patras and the surrounding area, a region of major socioeconomic importance for Greece. Displacement rates for the period 2002–2010 obtained from ascending and descending ASAR/ENVISAT multitemporal interferometry are combined with Global Positioning System measurements from permanent and campaign stations to produce a map of vertical and east‐west ground velocities. Cross sections are produced in order to quantify the deformation rates with higher precision. In the vertical, the motion combines tectonic deformation, urban subsidence, and subsidence due to deltaic sediments compaction. In the city of Patras and through the gulf of Patras, the northern continuation of the 2008 Movri earthquake fault is connected to the oblique transform zone of Rio. Further east, our observations suggest the existence of postseismic deformation at Aigion in the 15 years following the Mw = 6.2, 15 June 1995 Aigion earthquake. The inferred deforming zone, assuming a simple slow slipping model, is located at the western end of the 1995 fault, with radius ~3.5 km, centroid depth ~4 km, and cumulated postseismic moment representing 28% of the coseismic. Alluvial fan deltas subside due to their compaction with a gradient that increases toward the shore. Several of those deltas are located in the hanging‐wall of active faults.

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New constraints from seismology and geodesy on the Mw = 6.4 2008 Movri (Greece) earthquake: evidence for a growing strike-slip fault system

Cited by 29 publications

References 26 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

Ground Deformations in the Corinth Rift, Greece, Investigated Through the Means of SAR Multitemporal Interferometry

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