The Cephalonia Transform Fault and its extension to western Lefkada Island (Greece)

Louvari, E.; Kiratzi, Anastasia; Papazachos, B. C.

doi:10.1016/s0040-1951(99)00078-5

Cited by 212 publications

(156 citation statements)

References 29 publications

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“…Strikeslip fault sources B1-B3 are characterized by a steep dip (> 50 • ) and a maximum depth of 20-25 km, as revealed by seismic lines and seismological information on earthquake location and fault plane solutions (e.g. Louvari et al, 1999;Kokinou et al, 2005Kokinou et al, , 2006Feng et al, 2010;Shaw and Jackson, 2010 (Kahle et al, 1996;Hollenstein et al, 2008). These values are consistent with the long-term geological offset of 100-120 km attained by the fault in 6-8 My of activity (Royden and Papanikolau, 2011).…”

Section: Crustal Fault Sources (Type 1): Ionian Island Transform Faulsupporting

confidence: 63%

“…Because of lack of available data, we estimated their slip rates only on the basis of general considerations on plate convergence. Focal mechanisms from earthquakes in the area around the Ionian Islands show both strike-slip and reverse faulting (Papazachos et al, 1998;Louvari et al, 1999;Kokinou et al, 2006) with P-axes generally trending around 40 • N and rotating to 80 • N near Cephalonia Island . Several M > 6 earthquakes hit this area since ancient times.…”

Section: Crustal Fault Sources (Type 1): Ionian Island Transform Faulmentioning

confidence: 99%

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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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Section: Crustal Fault Sources (Type 1): Ionian Island Transform Faulsupporting

confidence: 63%

Section: Crustal Fault Sources (Type 1): Ionian Island Transform Faulmentioning

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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show abstract

“…One possible scenario is that the activated strike-slip faults comprise the southern prolongation of the NNE-SSW trending Lefkada segment of the CTFZ. Papadopoulos et al (2014) suggested that the Lefkada CTFZ segment does not terminate off the coast of NW Cephalonia, as proposed by previous authors (Louvari et al, 1999), but extends further into western Cephalonia. Another scenario is that the activated strike-slip faults comprise segments of a 30 km, nearly N-S trending fault zone that splits the island into a western and an eastern part.…”

Section: Seismotectonic Implications and Discussionmentioning

confidence: 56%

“…No earthquake activity developed off the coast of western Cephalonia. As a consequence, the JanuaryFebruary 2014 earthquake sequence can hardly be seismotectonically associated with the Cephalonia segment of the major right-lateral strike-slip structure of the CTFZ, as the latter was proposed by Louvari et al (1999). On the contrary, the aftershock pattern implies that the 2014 activity ruptured western Cephalonia due to onshore strike-slip faulting.…”

Section: Seismotectonic Implications and Discussionmentioning

confidence: 96%

High-precision relocation of seismic sequences above a dipping Moho: the case of the January–February 2014 seismic sequence on Cephalonia island (Greece)

et al. 2015

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Abstract. Detailed velocity structure and Moho mapping is of crucial importance for a high precision relocation of seismicity occurring out of, or marginal to, the geometry of seismological networks. Usually the seismographic networks do not cover the boundaries of converging plates such as the Hellenic arc. The crustal thinning from the plate boundary towards the back-arc area creates significant errors in accurately locating the earthquake, especially when distant seismic phases are included in the analysis. The case of the Cephalonia (Ionian Sea, Greece) sequence of JanuaryFebruary 2014 provided an excellent example where the hypocentral precision was greatly affected by the crustal thinning from the plate boundary at the Ionian sea towards the Aegean sea. This effect was examined in detail by testing various velocity models of the region in order to determine an optimal model. Our tests resulted in the adoption of a velocity model that resembles the crustal thinning of the region. Then, a relocation procedure was performed in the Cephalonia sequence for the time period of 26 January to 15 May 2014 by applying probabilistic non-linear location algorithms. The high-precision relocation resulted in an improved spatial distribution of the seismicity with respect to the preliminary locations and provided a reliable basis to examine seismotectonic implications of the Cephalonia sequence.

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“…We also used data from the Euro Mediterranean Seismological Center (EMSC) and Harvard (CMT solutions) databases from 2003 to 2011, as well as solutions published in a large number of previous studies (e.g. Papazachos et al, 1983;Benetatos et al, 2004;Kiratzi and Louvari, 2003;Taymaz et al,1991;Louvari et al, 1999;Kiratzi et al,1991;Yilmazturk and Burton, 1999;Arvidsson & Ekstrom, 1998;Bernard et al, 1997;Louvari et al, 2001;Kiratzi and Louvari, 2003;Vamvakaris et al, 2006). …”

Section: Data Usedmentioning

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

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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 Cephalonia Transform Fault and its extension to western Lefkada Island (Greece)

Cited by 212 publications

References 29 publications

Integrating geologic fault data into tsunami hazard studies

Integrating geologic fault data into tsunami hazard studies

High-precision relocation of seismic sequences above a dipping Moho: the case of the January–February 2014 seismic sequence on Cephalonia island (Greece)

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

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