Neotectonic evolution of northwestern-continental Greece

Abstract

ZusammenfassungSp~itmioz~ine Sedimentationsprozesse sowie strukturelle Entwicklung ~ndern sich in NW kontinental-Griechenland in E-W Richtung.An der Ionischen Kiiste wurden w~hrend der sp~tmio-z~inen Absenkung des Sedimentationsraumes m~chtige Olisthostrome und intrafoliale Falten gebildet. An der Grenze des Plio/Pleistoz~s wurden flache Uberschiebungen, L6sungsschieferung und NNW bis NNE streichende, ge6ffnete Falten entwickelt. Diese tektonische Strukturen sind das Ergebnis aktiver Plattenkonvergenz zwischen der apulischen lithosph~ren-Platte und der ~g~ischen Platte. W~ihrend der postorogenen Aufhebung sind NNW und ENE streichende Verwerfungen entstanden.Im mittleren Plioz~n wurden im Raum zwischen Ionischem Meer und der Pindos Uberschiebung anf dern gefalteten und teilweise erodierten Untergrund vorwiegend limnisch-terrestrische Sedimente abgelagert. W{ihrend der postorogenen Ausweitung sind Absenkungsr~ume in NNW-und ENE Richtung entstanden. Sie sind vermutlich das Ergebnis von Konvektionsstr6mungen innerhalb der Asthenosph~ire, die durch die Hellenische Subduktion hervorgerufen wurden.Die Krustenausdehnung im )~g~iischen ,~back-arc basin,, hat sich kontinuierlich gegen Westen verlagert, so d~ West-Griechenland zus~itztich yon WNW streichenden Grabenstrukturen weitgehend deformiert ist. AbstractThe post-Miocene sedimentary and structural evolution of NW-continental Greece changes from west to east.In the west, along the Ionian coast, the tectonic activity of the Mio-Pliocene marine sedimentation is reflected in olisthostromes and intrafoliated folds. During the emergence of the area at the Pliocene/Pleistocene boundary, low angle thrusting, dissolution cleavage and open NNW to NNE trending folds, were developed. This horizontal shortening is the result of active plate convergence between the Apulian plate and the Aegean plate. Subsequent vertical movements continuing till the precent, produces mainly NNW and ENE directed faults. *) Authors' address: Dr. Th. DOUTSOS, Dr. N. KONTO-VOULOS and Dr. D. FI~YDAS, Geological Department, University of Patras, Patras, Greece.In the east, between the Ionian coast and Pindus thrust, nonmarine sedimentation began, in the middle Pliocene, on a folded and partially eroded substratum. Long fault bounded intramountaneous basins formed during general uplift and extension in three directions: NNW, ENE and WNW. Extension in both areas, resulting from NNW and ENE faults, is interpreted in terms of the action of upwelling convective currents induced by the Hellenic subduction. As the Aegean back arc extension migrated slowly westwards, the whole study area was gradually affected by WNW trending grabens. R6sum~La partie nord-occidentale de la Grace continentale montre, d'est en ouest, une modification des processus s6dimentaires et structuraux.A l'ouest, le long de la c6te ionienne, la sedimentation marine subsidente tardi-mioc~ne s'est accompagn& de puissants olisthostromes et de plis intrafoliaux. La limite Plioc~ne-Pleistoc~ne a vu se d&elopper des charriages peu inclines et des...

The April 2007 Swarm in Trichonis Lake Using Data From a Microseismic Network

“…The main tectonic feature in the area is the Trichonis lake fault that bounds the graben to the south and forms a distinct topographic escarpment (Doutsos , 1987). Nevertheless this fault didn't rapture during the earthquake sequence under study, as suggested by Evangelidis, 2008 andKiratzi et al, 2008.…”

“…The broader area of Trichonis lake is an active graben (Doutsos , 1987) with WNW-ESE strike and a length of about 30km (Fig.1). It is formed almost perpendicular to the Hellenides fold and thrust structures and is bounded by large normal faults.…”

Landscape Geomorphological Evolution and Coastal Changes: A Case Study of Coastal Evolution in the Western Patraikos Gulf Area, Western Greece

“…The Patraikos Gulf located on the northwestern part of Peloponnese, lies approximately 100 km east of the Hellenic trench, immediately behind the Plioquaternary fold belt, which runs parallel to the coast of western Greece (Doutsos et al, 1987). The mountains of Klokova and Varasova are located to the northeast of the Gulf, consisted of Cretaceous limestones and Eocene flysch (Gavrovo zone).…”

“…From a tectonic point of view, Patraikos Gulf area consists the western part of a major East/West graben system, behind the Plioquaternary fold belt (Doutsos et al, 1987). This graben system extends from the boundary of a marginal compressional zone (Brooks and Ferentinos, 1984) associated with the subducting Western Hellenic arc, to the center of the Aegean Sea (Figure 2).…”

Earthquake relocation for North-Western Greece using 3D crustal model; method comparison and seismotectonic interpretation.

“…Studies of the focal mechanisms from earthquakes within the area, have shown that the tectonic regime of the area varies from thrust and strike slip to normal (Mercier et al, 1972;King et al, 1983;Doutsos et al, 1987;Underhill, 1989;Waters, 1994;Hatzfeld et al, 1995).…”