Palaeoseismological Analysis of the East Giouchtas Fault, Heraklion Basin, Crete (Prelimenary Results)

Zygouri, Vasiliki; Koukouvelas, Ioannis; Ganas, A.

doi:10.12681/bgsg.11756

Cited by 11 publications

(8 citation statements)

References 12 publications

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“…Sets of possibly-active normal faults striking NW-SE and NE-SW occur inside the Heraklion basin, as well ( Fig. 1; Fassoulas, 2001;Ganas et al, 2010;2011;Zygouri et al, 2016).…”

Section: Introductionmentioning

confidence: 86%

Geological and seismological evidence for NW-SE crustal extension at the southern margin of Heraklion basin, Crete.

Ganas

Fassoulas²,

Moshou³

et al. 2017

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In this paper we present new geological and seismological data on the orientation of crustal extension in central Crete (SE Heraklion basin) following the occurrence of two shallow seismic sequences: a) the May 2005 Assimi M=4.1 earthquake sequence and b) the 2013 Houdetsi-Tefeli sequence (3.2≤Mw≤3.6). Emphasis is given to the results of the geological field work, stress analysis, source inversion, aftershock relocations and mapping of earthquake-induced environmental effects. For the first time we find seismological evidence for N-S strike-slip motions along shallow fault planes in central Crete (Amourgeles fault). Our results indicate that while crustal extension dominates there is a combination of active fault kinematics, ranging from normal faulting along the northern edge of Messara basin (south-dipping Plakiotissa fault) to strike-slip faulting inside the SE part Heraklion basin (Houdetsi-Tefeli). The combination of active fault motions accommodates a NW-SE extension of the upper crust.

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“…Sets of possibly-active normal faults striking NW-SE and NE-SW occur inside the Heraklion basin, as well ( Fig. 1; Fassoulas, 2001;Ganas et al, 2010;2011;Zygouri et al, 2016).…”

Section: Introductionmentioning

confidence: 86%

Geological and seismological evidence for NW-SE crustal extension at the southern margin of Heraklion basin, Crete.

Ganas

Fassoulas²,

Moshou³

et al. 2017

geosociety

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“…The Heraklion basin is located in the central part of the Hellenic Arc and is characterised by extensional faulting, mainly along N-S and NW-SE directions [9,25,26]. Extensional features (intrabasinal highs, axial drainage etc.)…”

Section: Tectonic Settingmentioning

confidence: 99%

“…According to the latest GNSS results by Briole et al ( [23]; see their Figure 9) there is extension in the ~NW-SE direction of the order of ~0.5-1 mm/yr near Heraklion. This process is also manifested in the orientation of the local active faults and the topography of this region [9,13,16,[24][25][26]. In this study, we present an analysis of seismological, geological, and geodetic data that constrain the location and geometry of the activated fault that ruptured with the M5.9 earthquake of 27 September 2021.…”

Section: Introductionmentioning

confidence: 99%

The Arkalochori Mw = 5.9 Earthquake of 27 September 2021 Inside the Heraklion Basin: A Shallow, Blind Rupture Event Highlighting the Orthogonal Extension of Central Crete

et al. 2022

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A strong, shallow earthquake occurred near Heraklion (Crete, Greece) on 27 September 2021. The earthquake produced significant ground deformation in the vicinity of Arkalochori village but without any evidence for surface ruptures of primary origin. We used geodetic (InSAR and GNSS) data to map motions of the Earth’s surface that occurred during and shortly after the earthquake. A 14 cm subsidence of the GNSS station ARKL and a maximum of 19 cm distance from the SAR satellite were recorded. The measured surface displacements were used to constrain the rupture geometry and slip distribution at depth. Our best-fitting inversion model suggests that the rupture occurred on a 13 km-long planar normal fault striking N195° E dipping 55° to the northwest, with major slip occurring to the east and updip of the hypocentre. The fault tip is located 1.2 km beneath the surface. The maximum coseismic slip occurred in the uppermost crust, in the depth interval of 4–6 km. A decrease in the fault offsets toward the Earth’s surface is likely caused by an increased frictional resistance of the shallow layers to rapid coseismic slip. Satellite observations made in the first month after the earthquake detected no post-seismic deformation (i.e., below one fringe or 2.8 cm). The seismic fault may be identified with the Avli (Lagouta) segment of the NNE-SSW striking, west-dipping, 23 km-long neotectonic Kastelli Fault Zone (KFZ). Part of the rupture occurred along the Kastelli segment, indicating a fault segment linkage and a history of overlapping ruptures along KFZ. Based on geological data and footwall topography we estimate an average slip rate between 0.17–0.26 mm/yr for the KFZ. The Arkalochori earthquake is a paradigm example for the on-going extension of Heraklion basin (central Crete) in the WNW-ESE direction, which is almost orthogonal to the E-W Messara graben and other active faults along the south coast of Crete.

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“…Upper-Plate Faults and their Context Within a Converging Zone While thrust faulting dominates the offshore of southern Crete at depths above and along the subduction interface, shallower depths of <15 km and closer to the southern shoreline of Crete are predominantly characterized by normal and transtensional faulting (Alves et al, 2007;Kokinou et al, 2012;Papazachos, 1990;Ten Veen & Kleinspehn, 2003). Onshore, normal faulting is prevalent, with the strikes of these dip-slip faults having multiple directions suggesting a complex extensional regime (Caputo et al, 2010;Ganas et al, 2017;Mercier et al, 1987;Zygouri et al, 2016). The active normal faults broadly trend E-W or N-S with the exception of the Ierapetra and Kastelli faults, which trend NE-SW (Strobl et al, 2014) (Figure 1a).…”

Section: 1029/2018tc005410mentioning

confidence: 99%

Temporally Constant Quaternary Uplift Rates and Their Relationship With Extensional Upper‐Plate Faults in South Crete (Greece), Constrained With³⁶Cl Cosmogenic Exposure Dating

et al. 2019

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Preserved sets of marine terraces and palaeoshorelines above subduction zones provide an opportunity to explore the long‐term deformation that occurs as a result of upper‐plate extension. We investigate uplifted palaeoshorelines along the South Central Crete Fault and over its western tip, located above the Hellenic Subduction Zone, in order to derive uplift rates and examine the role that known extensional faults contribute to observed coastal uplift. We have mapped palaeoshorelines and successfully dated four Late‐Quaternary wave‐cut platforms using in situ 36Cl exposure dating. These absolute ages are used to guide a correlation of palaeoshorelines with Quaternary sea level highstands from 76.5 to ~900 ka; the results of which suggest that uplift rates vary along fault strikes but have been constant for up to 600 ka in places. Correlation of palaeoshorelines across the South Central Crete Fault results in a throw‐rate of 0.41 mm/year and, assuming repetition of 1.1‐m slip events, a fault‐specific earthquake recurrence interval of approximately 2,700 years. Elastic‐half‐space modeling implies that coastal uplift is related to offshore upper‐plate extensional faults. These faults may be responsible for perturbing the uplift rate signals in the south central Crete area. Our findings suggest that where uplifted marine terraces are used to make inferences about the mechanisms responsible for uplift throughout the Hellenic Subduction Zone, and other subduction zones worldwide, the impact of upper‐plate extensional faults over multiple seismic cycles should also be considered.

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Palaeoseismological Analysis of the East Giouchtas Fault, Heraklion Basin, Crete (Prelimenary Results)

Abstract: A paleoseismological analysis has been performed at the East Giouchtas Fault. This fault dips to the east and represents a pure normal fault. The East Giouchtas Fault forms an intrabasinal high in the Heraklion

Cited by 11 publications

References 12 publications

Geological and seismological evidence for NW-SE crustal extension at the southern margin of Heraklion basin, Crete.

Geological and seismological evidence for NW-SE crustal extension at the southern margin of Heraklion basin, Crete.

The Arkalochori Mw = 5.9 Earthquake of 27 September 2021 Inside the Heraklion Basin: A Shallow, Blind Rupture Event Highlighting the Orthogonal Extension of Central Crete

Temporally Constant Quaternary Uplift Rates and Their Relationship With Extensional Upper‐Plate Faults in South Crete (Greece), Constrained With³⁶Cl Cosmogenic Exposure Dating

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Palaeoseismological Analysis of the East Giouchtas Fault, Heraklion Basin, Crete (Prelimenary Results)

Abstract: A paleoseismological analysis has been performed at the East Giouchtas Fault. This fault dips to the east and represents a pure normal fault. The East Giouchtas Fault forms an intrabasinal high in the Heraklion

Cited by 11 publications

References 12 publications

Geological and seismological evidence for NW-SE crustal extension at the southern margin of Heraklion basin, Crete.

Geological and seismological evidence for NW-SE crustal extension at the southern margin of Heraklion basin, Crete.

The Arkalochori Mw = 5.9 Earthquake of 27 September 2021 Inside the Heraklion Basin: A Shallow, Blind Rupture Event Highlighting the Orthogonal Extension of Central Crete

Temporally Constant Quaternary Uplift Rates and Their Relationship With Extensional Upper‐Plate Faults in South Crete (Greece), Constrained With36Cl Cosmogenic Exposure Dating

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Temporally Constant Quaternary Uplift Rates and Their Relationship With Extensional Upper‐Plate Faults in South Crete (Greece), Constrained With³⁶Cl Cosmogenic Exposure Dating