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Rocard
Rocard is a submarine volcano in French Polynesia, located between the island of Mehetia and the Teahitia Teahitia ("Standing Fire") is a submarine volcano, located northeast of the southeast tip of Tahiti of the Society Islands in the Pacific Ocean The Pacific Ocean is the largest and deepest of Earth's five oceanic divisions. It extends ... seamount. The volcano's summit is 2515m below sealevel. It has erupted in March 1966, September 1971, and July 1972. The volcano was first located in 1976 using seismograph records, and its existence confirmed by a bathymetric survey. In 2011 and 2013, seismic records suggested shallow magma outpouring from the volcano. References Volcanoes of French Polynesia Active volcanoes Submarine volcanoes Seamounts of the Pacific Ocean Hotspot volcanoes {{marine-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Society Hotspot
The Society hotspot is a volcanic hotspot in the south Pacific Ocean which is responsible for the formation of the Society Islands, an archipelago of fourteen volcanic islands and atolls spanning around 720 km of the ocean which formed between 4.5 and <1 Ma. There are currently two main hypotheses concerning the cause of volcanic activity. The conventional view is that the hotspot is underlain by a which has transported hot material from the lower mantle to the surface, creating the chain as the Pacific Plate has moved northwest over the plume. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Submarine Volcano
Submarine volcanoes are underwater vents or fissures in the Earth's surface from which magma can erupt. Many submarine volcanoes are located near areas of tectonic plate formation, known as mid-ocean ridges. The volcanoes at mid-ocean ridges alone are estimated to account for 75% of the magma output on Earth.Martin R. Speight, Peter A. Henderson, "Marine Ecology: Concepts and Applications", John Wiley & Sons, 2013. . Although most submarine volcanoes are located in the depths of seas and oceans, some also exist in shallow water, and these can discharge material into the atmosphere during an eruption. The total number of submarine volcanoes is estimated to be over 1 million (most are now extinct) of which some 75,000 rise more than 1 km above the seabed. Only 119 submarine volcanoes in Earth's oceans and seas are known to have erupted during the last 11,700 years. Hydrothermal vents, sites of abundant biological activity, are commonly found near submarine volcanoes. Effe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
French Polynesia
)Territorial motto: ( en, "Great Tahiti of the Golden Haze") , anthem = , song_type = Regional anthem , song = " Ia Ora 'O Tahiti Nui" , image_map = French Polynesia on the globe (French Polynesia centered).svg , map_alt = Location of French Polynesia , map_caption = Location of French Polynesia (circled in red) , mapsize = 290px , subdivision_type = Sovereign state , subdivision_name = , established_title = Protectorate proclaimed , established_date = 9 September 1842 , established_title2 = Territorial status , established_date2 = 27 October 1946 , established_title3 = Collectivity status , established_date3 = 28 March 2003 , established_title4 = Country status (nominal title) , established_date4 = 27 February 2004 , official_languages = French , regional_languages = , capital = Papeete , coordinates = , largest_city = Fa'a'ā , demonym = French Polynesian , ethnic_groups = 66.5% unmixed Polynesians7.1% mixed Polynesians9.3% Demis1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mehetia
Meheti'a or Me'eti'a is a volcanic island in the Windward Islands, in the east of the Society Islands in French Polynesia. This island is a very young active stratovolcano east of the Taiarapu Peninsula of Tahiti. It belongs to the Teahiti'a-Mehetia hotspot. The island has an area of and its highest point is 435 metres (1,427 ft). The peak is a well-defined volcanic crater. In 1981 the island was the centre of earthquakes. History Tahitian oral tradition holds that navigators stopped at Mehiti'a, which was regarded as sacred, on their long voyage to New Zealand. This oral history correlates with geological evidence found in southern New Zealand which can be traced back to Mehiti'a. The early Polynesian voyagers commonly gave Polynesian ancestral names and symbolism to new places. The high point of Mehetia is Mount Hiurai (Hi’ura’i/Hikurangi) The name Hikurangi in Aotearoa / New Zealand probably came from Mehetia and the name Hi’ura’i probably has its ori ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Teahitia
Teahitia ("Standing Fire") is a submarine volcano, located northeast of the southeast tip of Tahiti of the Society Islands in the Pacific Ocean, with its peak 1600 meters below the water surface. It belongs to the Society hotspot The Society hotspot is a volcanic hotspot in the south Pacific Ocean which is responsible for the formation of the Society Islands, an archipelago of fourteen volcanic islands and atolls spanning around 720 km of the ocean which formed between 4. .... Teahitia's last eruption occurred in 1985. The seamount has four prominent cones. Submersible dives in 1986 and 1989 found two active hydrothermal fields on the volcano's flanks. A further dive in 2013 found ongoing hydrothermal venting. Earthquake swarms in March 1982, July 1983, December 1983, and January 1985 have been associated with submarine eruptions. On 16 March 2008 Teahitia was the epicentre of an earthquake measuring 3.2 on the Richter scale. The weak tremor was felt in Tahiti, causing the beg ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volcanoes Of French Polynesia
A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. On Earth, volcanoes are most often found where tectonic plates are diverging or converging, and most are found underwater. For example, a mid-ocean ridge, such as the Mid-Atlantic Ridge, has volcanoes caused by divergent tectonic plates whereas the Pacific Ring of Fire has volcanoes caused by convergent tectonic plates. Volcanoes can also form where there is stretching and thinning of the crust's plates, such as in the East African Rift and the Wells Gray-Clearwater volcanic field and Rio Grande rift in North America. Volcanism away from plate boundaries has been postulated to arise from upwelling diapirs from the core–mantle boundary, deep in the Earth. This results in hotspot volcanism, of which the Hawaiian hotspot is an example. Volcanoes are usually not created where two tectonic plates slide pa ... [...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] |
Submarine Volcanoes
Submarine volcanoes are underwater vents or fissures in the Earth's surface from which magma can erupt. Many submarine volcanoes are located near areas of tectonic plate formation, known as mid-ocean ridges. The volcanoes at mid-ocean ridges alone are estimated to account for 75% of the magma output on Earth.Martin R. Speight, Peter A. Henderson, "Marine Ecology: Concepts and Applications", John Wiley & Sons, 2013. . Although most submarine volcanoes are located in the depths of seas and oceans, some also exist in shallow water, and these can discharge material into the atmosphere during an eruption. The total number of submarine volcanoes is estimated to be over 1 million (most are now extinct) of which some 75,000 rise more than 1 km above the seabed. Only 119 submarine volcanoes in Earth's oceans and seas are known to have erupted during the last 11,700 years. Hydrothermal vents, sites of abundant biological activity, are commonly found near submarine volcanoes. Eff ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seamounts Of The Pacific Ocean
A seamount is a large geologic landform that rises from the ocean floor that does not reach to the water's surface (sea level), and thus is not an island, islet or cliff-rock. Seamounts are typically formed from extinct volcanoes that rise abruptly and are usually found rising from the seafloor to in height. They are defined by oceanographers as independent features that rise to at least above the seafloor, characteristically of conical form.IHO, 2008. Standardization of Undersea Feature Names: Guidelines Proposal form Terminology, 4th ed. International Hydrographic Organization and Intergovernmental Oceanographic Commission, Monaco. The peaks are often found hundreds to thousands of meters below the surface, and are therefore considered to be within the deep sea. During their evolution over geologic time, the largest seamounts may reach the sea surface where wave action erodes the summit to form a flat surface. After they have subsided and sunk below the sea surface such flat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
