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Lake Island
A lake island is any landmass within a lake. It is a type of inland island. Lake islands may form a lake archipelago. Formation Lake islands may form in numerous ways. They may occur through a build-up of sedimentation as shoals, and become true islands through changes in the level of the lake. They may have been originally part of the lake's shore, and been separated from it by erosion, or they may have been left as pinnacles when the lake formed through a raising in the level of a river or other waterway (either naturally, or artificially through the damming of a river or lake). On creation of a glacial lake a moraine can form an island. They may also have formed through earthquake, meteor, or volcanic activity. In the latter case, crater or caldera islands exist, with new volcanic prominences in lakes formed in the craters of larger volcanoes. Other lake islands include ephemeral beds of floating vegetation, and islands artificially formed by human activity. Volcanic crat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Isola Martana
Isola may refer to : Places and jurisdictions France * Isola, Alpes-Maritimes, a municipality in the region Provence-Alpes-Côte d'Azur * Isola 2000, a village and ski resort of the municipality of Isola, Provence-Alpes-Côte d'Azur * Isole, a river in Brittany Italy ;Municipalities * Isola d'Asti, in the Province of Asti, Piedmont * Isola del Cantone, in the Province of Genoa, Liguria * Isola del Giglio, in the Province of Grosseto, Tuscany * Isola del Gran Sasso d'Italia, in the Province of Teramo, Abruzzo * Isola del Liri, in the Province of Frosinone, Lazio * Isola del Piano, in the Province of Pesaro and Urbino, Marche * Isola della Scala, in the Province of Verona, Veneto * Isola delle Femmine, in the Province of Palermo, Sicily * Isola di Capo Rizzuto, in the Province of Crotone, Calabria ** the former bishopric of Isola with see in the above town, now a titular Latin catholic see * Isola di Fondra, in the Province of Bergamo, Lombardy * Isola Dovarese, in t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ring Fault
In geology, a fault is a planar fracture or discontinuity in a volume of rock across which there has been significant displacement as a result of rock-mass movements. Large faults within Earth's crust result from the action of plate tectonic forces, with the largest forming the boundaries between the plates, such as the megathrust faults of subduction zones or transform faults. Energy release associated with rapid movement on active faults is the cause of most earthquakes. Faults may also displace slowly, by aseismic creep. A ''fault plane'' is the plane that represents the fracture surface of a fault. A ''fault trace'' or ''fault line'' is a place where the fault can be seen or mapped on the surface. A fault trace is also the line commonly plotted on geological maps to represent a fault. A ''fault zone'' is a cluster of parallel faults. However, the term is also used for the zone of crushed rock along a single fault. Prolonged motion along closely spaced faults can blur the d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lake Rotorua
Lake Rotorua () is the second largest lake in the North Island of New Zealand by surface area, and covers 79.8 km2. With a mean depth of only 10 metres it is considerably smaller than nearby Lake Tarawera in terms of volume of water. It is located within the Rotorua Caldera in the Bay of Plenty Region. Geography Lake Rotorua is fed with water from a number of rivers and streams; some such as the Utuhina flow with a water temperature warmer than the lake due to the thermal activity in the Rotorua area. Conversely streams on the northern shore such as the Hamurana Spring and the Awahou stream flow crystal clear water that has a constant temperature of 10 degrees Celsius. Other notable tributaries include the Ngongotahā stream, famous for trout fishing. Lake Rotorua flows directly into Lake Rotoiti via the Ohau Channel at the north eastern corner of the lake. The urban development of Rotorua extends along the south portion of the lake shore. Geology The lake was ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mokoia Island
__NOTOC__ Mokoia Island is located in Lake Rotorua in New Zealand. It has an area of 1.35 square kilometres. The uninhabited island is a rhyolite lava dome, rising to 180 metres above the lake surface. It was formed after the Rotorua caldera collapsed and rhyolitic magma was pushed through the cracks. One of the cracks was below where Mokoia island is today. The foreshores of the island have Geothermal activity, geothermal springs with hot spring water forming the Hinemoa pool, known to locals as Waikimihia. It also has very rich volcanic soil, which was why the local Māori grew sweet potato cultivation in Polynesia, kūmara on it. The stone statue of Matuatonga on the island protected the island's kūmara crop, and tohunga would bring seed kūmara to touch the statue. It was also a very good strategic location, which was why it was often fought over. Mokoia Island is privately owned by local Māori people, Māori iwi, who run it in conjunction with the New Zealand Department ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lake Tōya
is a volcanic caldera lake in Shikotsu-Toya National Park, Abuta District, Hokkaido, Japan. It is part of "Toya Caldera and Usu Volcano Global Geopark" which joins in Global Geoparks Network. The stratovolcano of Mount Usu lies on the southern rim of the caldera. The lake is nearly circular, being 10 kilometers in diameter from the eastwest and 9 kilometers from the northsouth. The town of Tōyako comprises most of the area surrounding the lake and the town of Sōbetsu is located on the eastern side. Lake Tōya is said to be the northernmost lake in Japan that never ices (with competing claim by nearby Lake Shikotsu), and the second most transparent lake in Japan. Nakajima Island is a recursive island in the middle of the lake which houses the ''Tōya Lake Forest Museum''. Lake Tōya was called ''Kim'un-to'' (キムウン (kim'un) means "in the mountain"Batchelor, John. (1905) ''An Ainu-English-Japanese Dictionary'' (Second ed.). Tokyo: Methodist Publishing House and � ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lake Mashū
( Ainu: Kamuy-to) is an endorheic crater lake formed in the caldera of a potentially active volcano. It is located in Akan Mashu National Park on the island of Hokkaido, Japan. It has been called the clearest lake in the world. Hydrology Lake Mashū is surrounded by steep crater walls high. It has no significant inlets and no outlet. The lake is one of the clearest in the world and one of the deepest in Japan. On August 1, 1931, the transparency of the water was measured at . Around the same time Lake Baikal was measured . This is the basis for the lake's claim to be the clearest in the world. Since the 1950s the transparency has tended to range between . The loss in transparency is probably due to the introduction of sockeye salmon and rainbow trout into the lake and landslides.NHK World HD Channel At the same time, the clarity of Lake Baikal has not been measured. In summer, the surface of Lake Mashū is often obscured by fog. There is usually fog covering around the lak ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lake Bolsena
Lake Bolsena () is a lake of volcano, volcanic origin in the northern part of the province of Viterbo called ''Alto Lazio'' ("Upper Latium") or ''Tuscia'' in central Italy. It is the largest volcanic lake in Europe. Roman historic records indicate activity of the Vulsini volcano occurred as recently as 104 BC; it has been dormant since then. The two islands in the southern part of the lake were formed by underwater eruptions following the collapse that created the depression. The lake is supplied entirely from the aquifer, rainfall and runoff, with one outlet at the southern end. A sewage treatment plant constructed in 1996 filters most of the raw sewage from the major surrounding communities, transported via pipeline to the facility on the Marta River. Fertilizers are a second source of contamination. The chemical content of the lake is monitored at several stations around it. The lake has a long historic tradition. The Romans called it ''Lacus Volsinii'', adapting the Etrus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lake Toba
Lake Toba (, Toba Batak: ᯖᯀᯬ ᯖᯬᯅ; romanized: ''Tao Toba'') is a large natural lake in North Sumatra, Indonesia, occupying the caldera of the Toba supervolcano. The lake is located in the middle of the northern part of the island of Sumatra, with a surface elevation of about , the lake stretches from to . The lake is about long, wide, and up to deep. It is the largest lake in Indonesia and the largest volcanic lake in the world. Toba Caldera is one of twenty geoparks in Indonesia, and was recognised in July 2020 as one of the UNESCO Global Geoparks. Lake Toba is the site of a supervolcanic eruption estimated at VEI 8 that occurred 69,000 to 77,000 years ago, representing a climate-changing event. Recent advances in dating methods suggest a more accurate eruption date of 74,000 years ago. It is the largest-known explosive eruption on Earth in the last 25 million years. According to the Toba catastrophe theory, the eruption had global consequences for human po ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Samosir Island
Samosir, or Samosir Island, is a large volcano, volcanic island in Lake Toba, located in North Sumatra, North Sumatra Province on the island of Sumatra in Indonesia. Administratively, Samosir Island is governed as six of the nine districts within Samosir Regency. The lake and island were formed after the eruption of Youngest Toba eruption, the Toba supervolcano some 75,000 years ago. At , Samosir is the largest island within an island and the fourth largest lake island in the world. It also contains two smaller lakes, Lake Sidihoni and . Across the lake on the east of the island lies Uluan Peninsula, the Uluan Peninsula. The island was historically linked to the mainland of Sumatra on its western part by a narrow isthmus connecting the town of Pangururan on Samosir and Tele, Sumatra, Tele on mainland Sumatra, but it was split by the Tano Ponggol Canal and bridge in 1906, which was widened in 2019. Tele consequently offers one of the best views of Lake Toba and Samosir Island. On ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lake Ilopango
Lake Ilopango is a crater lake which fills an 8 by 11 km: volcanic caldera in central El Salvador, on the borders of the San Salvador, La Paz, and Cuscatlán departments. The caldera, which contains the second largest lake in the country and is immediately east of the capital city, San Salvador, has a scalloped to high rim. Any surplus drains via the Jiboa River to the Pacific Ocean. The local military airbase, Ilopango International Airport, has annual airshows where international pilots from all over the world fly over San Salvador City and Ilopango lake. Eruptive history Four major dacitic–rhyolitic eruptions occurred during the late Pleistocene and Holocene, producing pyroclastic flows and tephra that blanketed much of the country. The caldera collapsed most recently sometime between 410 and 535 CE (based on radiocarbon dating of plant life directly related to the eruption),, esp. p.27. which produced widespread pyroclastic flows and devastated Mayan citi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lake Coatepeque
Coatepeque Caldera ( Nawat: , "at the snake hill") is a volcanic caldera in El Salvador in Central America. The caldera was formed during a series of rhyolitic explosive eruptions from a group of stratovolcanoes between about 72,000 and 57,000 years ago. Since then, basaltic cinder cones and lava flows formed near the west edge of the caldera, and six rhyodacitic lava domes have formed. The youngest dome, Cerro Pacho, formed after 8000 BC. Lake Coatepeque Lake Coatepeque () is a large crater lake in the east part of the Coatepeque Caldera. It is in Coatepeque municipality, Santa Ana, El Salvador. There are hot springs near the lake margins. At , it is one of the largest lakes in El Salvador. In the lake is the island of Teopan, which was a Mayan site of some importance. File:Coatepeque - santa ana by mimamor.png File:Isla Teopán.jpg, Isla Teopán File:Ilamatepec cloud covered.JPG Lake Coatepeque is also known to change colors from blue to turquoise. According t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cuicocha Lake
Cuicocha (Kichwa: ''Kuykucha'' 'lake of guinea pigs' or ''Kuychikucha'' 'rainbow lake') is a wide caldera and Volcanic crater lake, crater lake at the foot of Cotacachi Volcano in the Cordillera Occidental of the Ecuadorian Andes. Its name comes from the Kichwa indigenous language and means "Lago del Cuy" or Guinea Pig Lake in English. It was given this name due to the guinea pig shape of the largest Island in the middle of the laguna. These animals play a significant part in the everyday life of Ecuadorians, as they reproduce rapidly and need a minimum of food and care to survive. They make for a high protein meal especially for populations living in high altitude. The caldera was created by a massive eruption about 3100 years ago that generated about 5 cubic kilometres (6.54 billion cubic yards) of pyroclastic flow and covered the surrounding area in volcanic ash up to 20 cm (8 inches) deep. Activity continued until 650 CE. In combination with other erupti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
