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Big Ben (Heard Island)
Big Ben (previously known as Big Ben Peak, Old Ben Mountain, Emperor William Peak and Kaiser Wilhelm-Berg) is a Volcano, volcanic massif that dominates the geography of Heard Island and McDonald Islands, Heard Island in the southern Indian Ocean. It is a stratovolcano with a diameter of about . Its highest point is Mawson Peak, which is Above mean sea level, above sea level. Much of it is covered by ice, including 14 major glaciers which descend from Big Ben to the sea. Big Ben is the highest mountain in Australian states and territories, except for those claimed in the Australian Antarctic Territory. A smaller volcanic headland, the Laurens Peninsula, extends about to the northwest, created by a separate volcano, Mount Dixon, Heard Island, Mount Dixon; its highest point is Anzac Peak, at . Volcanic activity Volcanic activity at the cone has been known since 1881. An Types of volcanic eruptions, eruption occurred in 1993. Satellite images detected eruptions during 2000. On 2 Fe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heard Island And McDonald Islands
The Territory of Heard Island and McDonald Islands (HIMI) is an Australian external territory comprising a volcanic group of mostly barren Antarctic islands, about two-thirds of the way from Madagascar to Antarctica. The group's overall size is in area and it has of coastline. Discovered in the mid-19th century, the islands lie on the Kerguelen Plateau in the Indian Ocean and have been an Australian territory since 1947. They contain Australia's only two active volcanoes. The summit of one, Mawson Peak, is higher than any mountain in all other Australian states or territories, except Dome Argus, Mount McClintock and Mount Menzies in the Australian Antarctic Territory. The islands are among the most remote places on Earth: They are located about southwest of Perth, southwest of Cape Leeuwin, Australia, southeast of South Africa, southeast of Madagascar, north of Antarctica, and southeast of the Kerguelen Islands (part of French Southern and Antarctic Lands). The is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stratovolcano
A stratovolcano, also known as a composite volcano, is a conical volcano built up by many layers (strata) of hardened lava and tephra. Unlike shield volcanoes, stratovolcanoes are characterized by a steep profile with a summit crater and periodic intervals of explosive eruptions and effusive eruptions, although some have collapsed summit craters called calderas. The lava flowing from stratovolcanoes typically cools and hardens before spreading far, due to high viscosity. The magma forming this lava is often felsic, having high-to-intermediate levels of silica (as in rhyolite, dacite, or andesite), with lesser amounts of less-viscous mafic magma. Extensive felsic lava flows are uncommon, but have travelled as far as . Stratovolcanoes are sometimes called composite volcanoes because of their composite stratified structure, built up from sequential outpourings of erupted materials. They are among the most common types of volcanoes, in contrast to the less common shield volca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pleistocene Stratovolcanoes
The Pleistocene ( , often referred to as the ''Ice age'') is the geological epoch that lasted from about 2,580,000 to 11,700 years ago, spanning the Earth's most recent period of repeated glaciations. Before a change was finally confirmed in 2009 by the International Union of Geological Sciences, the cutoff of the Pleistocene and the preceding Pliocene was regarded as being 1.806 million years Before Present (BP). Publications from earlier years may use either definition of the period. The end of the Pleistocene corresponds with the end of the last glacial period and also with the end of the Paleolithic age used in archaeology. The name is a combination of Ancient Greek grc, label=none, πλεῖστος, pleīstos, most and grc, label=none, καινός, kainós (latinized as ), 'new'. At the end of the preceding Pliocene, the previously isolated North and South American continents were joined by the Isthmus of Panama, causing a faunal interchange between the two reg ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Active Volcanoes
An active volcano is a volcano which is either erupting or is likely to erupt in the future. An active volcano which is not currently erupting is known as a dormant volcano. Overview Tlocene Epoch. Most volcanoes are situated on the Pacific Ring of Fire. An estimated 500 million people live near active volcanoes. ''Historical time'' (or recorded history) is another timeframe for ''active''. However, the span of recorded history differs from region to region. In China and the Mediterranean, it reaches back nearly 3,000 years, but in the Pacific Northwest of the United States and Canada, it reaches back less than 300 years, and in Hawaii and New Zealand it is only around 200 years. The incomplete ''Catalogue of the Active Volcanoes of the World'', published in parts between 1951 and 1975 by the International Association of Volcanology, uses this definition, by which there are more than 500 active volcanoes. , the Smithsonian Global Volcanism Program recognizes 560 volcanoes with ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
American Geophysical Union
The American Geophysical Union (AGU) is a 501(c)(3) nonprofit organization of Earth, atmospheric, ocean, hydrologic, space, and planetary scientists and enthusiasts that according to their website includes 130,000 people (not members). AGU's activities are focused on the organization and dissemination of scientific information in the interdisciplinary and international fields within the Earth and space sciences. The geophysical sciences involve four fundamental areas: atmospheric and ocean sciences; solid-Earth sciences; hydrologic sciences; and space sciences. The organization's headquarters is located on Florida Avenue in Washington, D.C. History The AGU was established in December 1919 by the National Research Council (NRC) to represent the United States in the International Union of Geodesy and Geophysics (IUGG), and its first chairman was William Bowie of the United States Coast and Geodetic Survey (USCGS). For more than 50 years, it operated as an unincorporated affili ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Volcanoes In Australia
This is a list of active, dormant and extinct volcanoes in Australia and its island territories. Note that the term volcano is used loosely as it can include groups of related volcanoes and vents that erupted at similar times with lava of related origin. The lists provided below are mainly volcanoes of Cenozoic aged, with some notable older (Mesozoic and Paleozoic aged), volcanoes included. There are no volcanoes on the Australian mainland that have erupted since European settlement, but some volcanoes in Victoria, South Australia and North Queensland could have been witnessed by Aboriginal people several thousand years ago. There are active volcanoes in the Heard and McDonald Islands. Australian states Queensland New South Wales Victoria South Australia South Australia's volcanoes are the youngest in Australia, and erupted within the memory of local Indigenous peoples. They are all in the Limestone Coast region, in the Mount Burr Range. They are considered ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atlas Cove
Atlas Cove is a cove on the north coast of Heard Island and McDonald Islands in the southern Indian Ocean, and is entered between the base of the Laurens Peninsula and Rogers Head. It was named by American sealers after the schooner seal hunting fleet which landed at Heard Island in 1855. The name appears on a chart by the Challenger expedition under George Nares Vice-Admiral Sir George Strong Nares (24 April 1831 – 15 January 1915) was a Royal Navy officer and Arctic explorer. He commanded the ''Challenger'' Expedition, and the British Arctic Expedition. He was highly thought of as a leader an ..., which visited the island in in 1874 and utilized the names then in use by the sealers. From 1947 to 1955, Atlas Cove was the site of camps of visiting scientists. In 1969, it was again occupied by American scientists. The settlement was expanded in 1971 by French scientists. Mapping was updated in 2000. References External links Map of Atlas Cove and the northweste ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Types Of Volcanic Eruptions
Several types of volcanic eruptions—during which lava, tephra (ash, lapilli, volcanic bombs and volcanic blocks), and assorted gases are expelled from a volcanic vent or fissure—have been distinguished by volcanologists. These are often named after famous volcanoes where that type of behavior has been observed. Some volcanoes may exhibit only one characteristic type of eruption during a period of activity, while others may display an entire sequence of types all in one eruptive series. There are three different types of eruptions: * Magmatic eruptions are the most well-observed type of eruption. They involve the decompression of gas within magma that propels it forward. * Phreatic eruptions are driven by the superheating of steam due to the close proximity of magma. This type exhibits no magmatic release, instead causing the granulation of existing rock. * Phreatomagmatic eruptions are driven by the direct interaction of magma and water, as opposed to phreatic erup ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anzac Peak
Anzac Peak is a volcano on the Laurens Peninsula of Heard Island in the Southern Ocean. It lies to the northwest of Mawson Peak. Despite its low elevation of just over 700 metres high, the peak and several neighbouring peaks have permanent snow and ice, like the Jacka Glacier with several icefalls.Google Earth images. See also *List of volcanoes in Antarctica *List of volcanoes in Australia This is a list of active, dormant and extinct volcanoes in Australia and its island territories. Note that the term volcano is used loosely as it can include groups of related volcanoes and vents that erupted at similar times with lava of rel ... References External links *Clichereto see a map of Heard Island and McDonald Islands, including all major topographical features Mountains of Australia Volcanoes of Heard Island and McDonald Islands ANZAC (Australia) {{Subantarctic-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mount Dixon, Heard Island
Mount Dixon () is a snow-covered stratovolcano, high, standing west of Anzac Peak on the Laurens Peninsula, Heard Island. The feature appears to have been roughly charted on an 1860 sketch map by Captain H.C. Chester, an American sealer operating in the area during this period. It was surveyed in 1948 by the Australian National Antarctic Research Expeditions (ANARE), and named by them for Lieutenant Commander George M. Dixon, RANVR, commanding officer of HMAS ''Labuan'' which landed and relieved the 1948 and 1949 ANARE parties. The peak is northwest of Big Ben Big Ben is the nickname for the Great Bell of the Great Clock of Westminster, at the north end of the Palace of Westminster in London, England, and the name is frequently extended to refer also to the clock and the clock tower. The officia .... No activity has been observed on Mount Dixon, however some lava flows that are vegetation-free suggest an eruption within the last few hundred years. References ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Laurens Peninsula
Laurens Peninsula () is a rugged peninsula surmounted by several ice-covered peaks that forms the northwestern part of Heard Island in the southern Indian Ocean. The name was applied by the Australian National Antarctic Research Expedition following their survey in 1948. It derives from the existing name Cape Laurens, applied for the northwestern extremity of this peninsula after the American bark ''Laurens'' which, under Captain Franklin F. Smith, visited Heard Island in 1855–56 and assisted in initiating sealing operations there. A small hill called Macey Cone sits at the northwest end of the peninsula. References External links Map of Laurens Peninsula and the northwestern coast of Heard IslandMap of Heard Island and McDonald Islands, including all major topographical features Peninsulas of Antarctica Landforms of Heard Island and McDonald Islands Laurens Peninsula Laurens Peninsula () is a rugged peninsula surmounted by several ice-covered peaks that forms the northw ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Australian Antarctic Territory
The Australian Antarctic Territory (AAT) is a part of East Antarctica claimed by Australia as an external territory. It is administered by the Australian Antarctic Division, an agency of the federal Department of Climate Change, Energy, the Environment and Water. The territory's history dates to a claim on Enderby Land made by the United Kingdom in 1841, which was subsequently expanded and eventually transferred to Australia in 1933. It is the largest territory of Antarctica claimed by any nation by area. In 1961, the Antarctic Treaty came into force. Article 4 deals with territorial claims, and although it does not renounce or diminish any pre-existing claims to sovereignty, it also does not prejudice the position of Contracting Parties in their recognition or non-recognition of territorial sovereignty. As a result, only four other countries — New Zealand, the United Kingdom, France, and Norway recognise Australia's claim to sovereignty in Antarctica. Area The AAT consists ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
