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Alfeios Basin
The Alfeiós or Alpheios ( el, Αλφειός, grc, Ἀλφειός, Latin Alpheus) is the main stream of the Alpheios Valley drainage system, a dendritic type, originating on the north slopes of Mount Taygetus, located in the center of the Peloponnesus of Greece, and flowing to the northwest to the vicinity of Olympia, where it turns to the west and, after being impounded by the Flokas Dam, a hydroelectric facility, empties into the Gulf of Kyparissia of the Ionian Sea south of Pyrgos. The entrance into the gulf through agricultural land and across an unpopulated, sandy beach partially blocked by a spit is hydrologically unspectacular, with the water too shallow to be navigable by any but the smallest craft. The concept of a single source has little meaning for most of the rivers of Greece, which begin as a confluence of multiple springs in the mountain valleys. There is almost never just one, although most may be unreported or neglected. Thus it is appropriate to speak "a sou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hjalmar Frisk
Hjalmar Frisk (4 August 1900, in Gothenburg – 1 August 1984, in Gothenburg) was a Swedish linguist and etymologist in Indo-European studies. He was also rector of the University of Göteborg from 1951 to 1966.Göteborgs Universitet Early on, he became interested in Indo-European studies. Thus, as early as 1927, he published a translation of the historical account '' The Periplus of the Erythraean Sea'', written in under the title Περίπλους τῆς Ἐρυθρᾶς θαλάσσης. His most noted work was the three-volume ''Griechisches etymologisches Wörterbu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arcadia (region)
Arcadia ( el, Ἀρκαδία) is a region in the central Peloponnese. It takes its name from the mythological character Arcas, and in Greek mythology it was the home of the gods Hermes and Pan. In European Renaissance arts, Arcadia was celebrated as an unspoiled, harmonious wilderness; as such, it was referenced in popular culture. The modern regional unit of the same name more or less overlaps with the historical region, but is slightly larger. History Arcadia was gradually linked in a loose confederation that included all the Arcadian towns and was named League of the Arcadians. In the 7th century BC, it successfully faced the threat of Sparta and the Arcadians managed to maintain their independence. They participated in the Persian Wars alongside other Greeks by sending forces to Thermopylae and Plataea. During the Peloponnesian War, Arcadia allied with Sparta and Corinth. In the following years, during the period of the Hegemony of Thebes, the Theban general Epaminond ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aegean Sea
The Aegean Sea ; tr, Ege Denizi (Greek language, Greek: Αιγαίο Πέλαγος: "Egéo Pélagos", Turkish language, Turkish: "Ege Denizi" or "Adalar Denizi") is an elongated embayment of the Mediterranean Sea between Europe and Asia. It is located between the Balkans and Anatolia, and covers an area of some 215,000 square kilometres. In the north, the Aegean is connected to the Marmara Sea and the Black Sea by the straits of the Dardanelles and the Bosphorus. The Aegean Islands are located within the sea and some bound it on its southern periphery, including Crete and Rhodes. The sea reaches a maximum depth of 2,639m to the west of Karpathos. The Thracian Sea and the Sea of Crete are main subdivisions of the Aegean Sea. The Aegean Islands can be divided into several island groups, including the Dodecanese, the Cyclades, the Sporades, the Saronic Islands, Saronic islands and the North Aegean islands, North Aegean Islands, as well as Crete and its surrounding islands. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hellenic Arc
The Hellenic arc or Aegean arc is an arcuate mountain chain of the southern Aegean Sea located on the southern margin of the Aegean Sea Plate. Geologically it results from the subduction of the African Plate under it along the Hellenic subduction zone. The Hellenic Trench trends parallel to its southern side. The Aegean Sea Plate, a microplate, is often considered part of the Eurasian Plate from which it is in the process of diverging. The arc itself is mainly marine, the mountaintops appearing as islands in the Ionian Sea, Crete and its environs, or in the Dodecanese group. It encroaches on mainland terrain in the Peloponnesus, on Crete, on Rhodes, and on the southern coast of Anatolia, thus being encompassed by both Greece and Turkey. The direction of subduction is northward. Locations on the arc or near it on the north side are therefore called "outer" as they are at the outer margin of the plate. Locations further north are "inner." Generally the motion of subduction is from ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Back-arc Basin
A back-arc basin is a type of geologic basin, found at some convergent plate boundaries. Presently all back-arc basins are submarine features associated with island arcs and subduction zones, with many found in the western Pacific Ocean. Most of them result from tensional forces, caused by a process known as oceanic trench rollback, where a subduction zone moves towards the subducting plate. Back-arc basins were initially an unexpected phenomenon in plate tectonics, as convergent boundaries were expected to universally be zones of compression. However, in 1970, Dan Karig published a model of back-arc basins consistent with plate tectonics. Structural characteristics Back-arc basins are typically very long and relatively narrow, often thousands of kilometers long while only being a few hundred kilometers wide at most. For back-arc extension to form, a subduction zone is required, but not all subduction zones have a back-arc extension feature. Back-arc basins are found in area ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hellenic Orogeny
The Hellenic orogeny is a collective noun referring to multiple mountain building events that shaped the topography of the southern margin of Eurasia into what is now Greece, the Aegean Sea and western Turkey, beginning in the Jurassic. Prior to then the supercontinent, Pangaea, had divided along a divergent boundary into two continents, Gondwana land and Laurasia, separated by a primordial ocean, Paleo-Tethys Ocean. As the two continents continued to break up, Gondwana, pushed by divergent boundaries developing elsewhere, began to drift to the north, closing the sea. As it went it split off a number of smaller land masses, terranes, which preceded it to the north. The Hellenic orogeny is the story of the collision first of these terranes and then of Gondwana, reduced to Africa, with Eurasia, and the closing of Tethys to the Mediterranean. The process has been ongoing since the Jurassic and continues today. Sequence of the orogeny In the late Jurassic, fragments of continental crus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Extensional Tectonics
Extensional tectonics is concerned with the structures formed by, and the tectonic processes associated with, the stretching of a planetary body's crust or lithosphere. Deformation styles The types of structure and the geometries formed depend on the amount of stretching involved. Stretching is generally measured using the parameter ''β'', known as the ''beta factor'', where : \beta = \frac \,, ''t''0 is the initial crustal thickness and ''t''1 is the final crustal thickness. It is also the equivalent of the strain parameter ''stretch''. Low beta factor In areas of relatively low crustal stretching, the dominant structures are high to moderate angle normal faults, with associated half grabens and tilted fault blocks. High beta factor In areas of high crustal stretching, individual extensional faults may become rotated to too low a dip to remain active and a new set of faults may be generated. Large displacements may juxtapose syntectonic sediments against metamorphic roc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Graben
In geology, a graben () is a depressed block of the crust of a planet or moon, bordered by parallel normal faults. Etymology ''Graben'' is a loan word from German, meaning 'ditch' or 'trench'. The word was first used in the geologic context by Eduard Suess in 1883. The plural form is either ''graben'' or ''grabens''. Formation A graben is a valley with a distinct escarpment on each side caused by the displacement of a block of land downward. Graben often occur side by side with horsts. Horst and graben structures indicate tensional forces and crustal stretching. Graben are produced from parallel normal faults, where the displacement of the hanging wall is downward, while that of the footwall is upward. The faults typically dip toward the center of the graben from both sides. Horsts are parallel blocks that remain between graben; the bounding faults of a horst typically dip away from the center line of the horst. Single or multiple graben can produce a rift valley. Half-g ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rift Valley
A rift valley is a linear shaped lowland between several highlands or mountain ranges created by the action of a geologic rift. Rifts are formed as a result of the pulling apart of the lithosphere due to extensional tectonics. The linear depression may subsequently be further deepened by the forces of erosion. More generally the valley is likely to be filled with sedimentary deposits derived from the rift flanks and the surrounding areas. In many cases rift lakes are formed. One of the best known examples of this process is the East African Rift. On Earth, rifts can occur at all elevations, from the sea floor to plateaus and mountain ranges in continental crust or in oceanic crust. They are often associated with a number of adjoining subsidiary or co-extensive valleys, which are typically considered part of the principal rift valley geologically. Earth's rift valleys The most extensive rift valley is located along the crest of the mid-ocean ridge system and is the result of s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Laconian Gulf
The Laconian Gulf ( el, Λακωνικός Κόλπος, translit=Lakonikos Kolpos), is a gulf in the south-eastern Peloponnese, in Greece. It is the southernmost gulf in Greece and the largest in the Peloponnese. In the shape of an inverted "U", it is approximately 58 km wide east-west, and 44 km long north-south. It is bounded to the west by the Mani peninsula, which separates it from the Messenian Gulf, and to the east by the Cape Maleas peninsula (also known as the Epidavros Limira peninsula), which separates it from the Aegean Sea. To the south it opens onto the Mediterranean Sea. The Mani and Cape Maleas peninsulas are dry and rocky, but the northern shore, fed by the Evrotas River, which empties into the gulf at its apex, is fertile farmland. The island of Elafonissos lies in the Laconian Gulf, with the island of Kythira directly to the south. The main ports and settlements on the gulf are Gytheio Gytheio ( el, Γύθειο, ) or Gythio, also the ancient Gyt ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eurotas (river)
The Eurotas ( grc, Εὐρώτας) or Evrotas (modern Greek: ) is the main river of Laconia and one of the major rivers of the Peloponnese, in Greece. The river's springs are located just northwest of the border between Laconia and Arcadia (regional unit), Arcadia, at Skortsinos. The river is also fed by underwater springs at Pellana and by tributaries coursing down from Taygetos, Mt. Taygetos and Parnon, Mt. Parnon, which flank the Eurotas valley to the west and east, respectively. The river is long, flowing in a north-south direction and emptying into the Laconian Gulf. Its drainage basin is . Etymology The classical Eurotas was changed to Iri in the Middle Ages and only changed back to Eurotas in recent times. Eurotas, however, is not the most ancient name of the river. It does not appear in the works of Homer, which purport to recount the stories and geography of Mycenaean Greece. In that legendary time, the Dorians are not known to have been present in the Eurotas Valley. A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
