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Barva Volcano
Barva Volcano is an andesitic stratovolcano complex in central Costa Rica, 22 km north of San José, in Heredia Province. On the eastern side of the mountain it has a lake in what was the volcanic crater, called "Laguna de Barva", and in the western side it has three hills on the top which are called "Las Tres Marías". It is located in the small agricultural community of Sacramento. Barva has several eruptive centres at its summit and many parasitic cones on its flanks. Its three principal summits visible from the Central Valley give it the common local name of ''Las Tres Marías'' (The Three Marys). Four pyroclastic cones are present within the 2 x 3 km caldera A caldera ( ) is a large cauldron-like hollow that forms shortly after the emptying of a magma chamber in a volcano eruption. When large volumes of magma are erupted over a short time, structural support for the rock above the magma chamber is ... at the central and northwestern part of the summit. The s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heredia Province
Heredia () is a province of Costa Rica. It is in the north-central part of the country. As a result, the province covers areas as diverse as the agriculture-rich Northern plains to the more metropolitan areas such as the city of Heredia in the Central Valley. It contains several major environmentally important areas such as the Braulio Carrillo National Park and the Sarapiqui River. The capital is the city of Heredia. To the north it borders Nicaragua, to the east is the province Limón, to the south the province San José, and to the west Alajuela. Geography The province covers an area of 2,657 km². The province is home to a variety of environments, including primary forests, tropical dry forests, and montane forests. Demographics In 1850, the province had a population of approximately 13,390. As of 2011, it has a population of 433,677. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Costa Rica
Costa Rica (, ; ; literally "Rich Coast"), officially the Republic of Costa Rica ( es, República de Costa Rica), is a country in the Central American region of North America, bordered by Nicaragua to the north, the Caribbean Sea to the northeast, Panama to the southeast, the Pacific Ocean to the southwest, and Maritime boundary, maritime border with Ecuador to the south of Cocos Island. It has a population of around five million in a land area of . An estimated 333,980 people live in the capital and largest city, San José, Costa Rica, San José, with around two million people in the surrounding metropolitan area. The sovereign state is a Unitary state, unitary Presidential system, presidential Constitution of Costa Rica, constitutional republic. It has a long-standing and stable democracy and a highly educated workforce. The country spends roughly 6.9% of its budget (2016) on education, compared to a global average of 4.4%. Its economy, once heavily dependent on agricultu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cordillera Central, Costa Rica
The Cordillera Central is a volcanic mountain range in central Costa Rica which continues from the Continental Divide to east of Cordillera de Tilarán. It extends 80 km from Tapezco Pass to the Turrialba Volcano and ending on the Pacuare River. It is separated from Cordillera de Tilarán by Balsa River and Platanar and Zarcero hills. The Cordillera Central is part of the American Cordillera, a chain of mountain ranges (cordillera) that consists of an almost continuous sequence of mountain ranges that form the western "backbone" of North America, Central America, South America and Antarctica. It contains four large volcanoes Poás (2,708 m), Barva (2,906 m), Irazú and Turrialba (3,340 m). The highest peak is Irazú at 3,432 m. South of the range lie elevated plains of central tectonic depression of Costa Rican Central Valley. Cordillera Central's four main volcanoes are protected as national parks. Volcanic massif of the Poás Volcano is the central feature of Poás ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Complex Volcano
A complex volcano, also called a compound volcano or a volcanic complex, is a mixed landform consisting of related volcanic centers and their associated lava flows and pyroclastic rock. They may form due to changes in eruptive habit or in the location of the principal vent area on a particular volcano. Stratovolcanoes can also form a large caldera that gets filled in by a lava dome, or else multiple small cinder cones, lava domes and craters may develop on the caldera's rim. Although a comparatively unusual type of volcano, they are widespread in the world and in geologic history. Metamorphosed ash flow tuffs are widespread in the Precambrian rocks of northern New Mexico, which indicates that caldera complexes have been important for much of Earth's history. Yellowstone National Park is on three partly covered caldera complexes. The Long Valley Caldera in eastern California is also a complex volcano; the San Juan Mountains in southwestern Colorado are formed on a group of N ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Andesite
Andesite () is a volcanic rock of intermediate composition. In a general sense, it is the intermediate type between silica-poor basalt and silica-rich rhyolite. It is fine-grained (aphanitic) to porphyritic in texture, and is composed predominantly of sodium-rich plagioclase plus pyroxene or hornblende. Andesite is the extrusive equivalent of plutonic diorite. Characteristic of subduction zones, andesite represents the dominant rock type in island arcs. The average composition of the continental crust is andesitic. Along with basalts, andesites are a component of the Martian crust. The name ''andesite'' is derived from the Andes mountain range, where this rock type is found in abundance. It was first applied by Christian Leopold von Buch in 1826. Description Andesite is an aphanitic (fine-grained) igneous rock that is intermediate in its content of silica and low in alkali metals. It has less than 20% quartz and 10% feldspathoid by volume, with at least 65% of the fe ... [...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] |
San José, Costa Rica
San José (; meaning "Saint Joseph") is the capital and largest city of Costa Rica, and the capital of the province of the same name. It is in the center of the country, in the mid-west of the Central Valley, within San José Canton. San José is Costa Rica's seat of national government, focal point of political and economic activity, and major transportation hub. San José Canton's population was 288,054 in 2011, and San José's municipal land area is 44.2 square kilometers (17.2 square miles), with an estimated 333,980 residents in 2015. Together with several other cantons of the central valley, including Alajuela, Heredia and Cartago, it forms the country's Greater Metropolitan Area, with an estimated population of over 2 million in 2017. The city is named in honor of Joseph of Nazareth. Founded in 1736 by order of Cabildo de León, the population of San José rose during the 18th century through the use of colonial planning. It has historically been a city of strat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sacramento, Costa Rica
Sacramento de Heredia is a small town in the district of San Jose de la Montana, Barva, Heredia, Costa Rica. It is home to the Braulio Carrillo National Park Braulio Carrillo National Park is a national park in Heredia Province and San José Province, in central Costa Rica. It is part of the Central Conservation Area. Geography The park is located on the volcanic Cordillera Central (Central mountain ... and the Bar y Restaurante Sacramento and is a popular tourist location. No census is available due to the fact there is no structured organization in the town, and the fact the population changes frequently, but approximates estimate at 200. Economy Sacramento's economy is largely based around the sole commercial entity, and popular weekend spot, the Bar Sacramento. From there, tourists often visit the Braulio Carrillo National Park up the road. Most of the populace is self-employed in the agricultural business. Populated places in Heredia Province {{CostaRica-geo-stu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parasitic Cone
A parasitic cone (also adventive cone or satellite cone) is the cone-shaped accumulation of volcanic material not part of the central vent of a volcano. It forms from eruptions from fractures on the flank of the volcano. These fractures occur because the flank of the volcano is unstable. Eventually, the fractures reach the magma chamber and generate eruptions called flank eruptions, which, in turn, produce a parasitic cone. A parasitic cone can also be formed from a dike or sill cutting up to the surface from the central magma chamber in an area different from the central vent. A peculiar example of multiple parasitic cones is Jeju Island in South Korea. Jeju features 368 " oreums" (; "mount"), which lie in a roughly lateral line on either side of the island's central dormant shield volcano Hallasan. See also *Flank crater A volcanic crater is an approximately circular depression in the ground caused by volcanic activity. It is typically a bowl-shaped feature containing ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Costa Rican Central Valley
The Central Valley () is a plateau and a geographic region of central Costa Rica. The land in the valley is a relative plain, despite being surrounded by several mountains and volcanoes, the latter part of the Central Range. The region houses almost three quarters of Costa Ricans, and includes the capital and most populous city, San José. The valley is shared among the provinces of Alajuela, Heredia, San José and Cartago. The region occupies an area of 11,366 km², more than a fifth of the country, and is drained by the Tárcoles River on the west side and by the Reventazón River on the east side. Geographic dimensions The Central Valley is commonly considered to extend from the city of San Ramón in Alajuela in the west, to the city of Paraíso in Cartago in the east. The mountains north of the valley are part of the Central Range. There are four main volcanoes north of the valley, namely Poás, Barva, Irazú and Turrialba. The mountains that round the plate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pyroclastic Cone
Volcanic cones are among the simplest volcanic landforms. They are built by ejecta from a volcanic vent, piling up around the vent in the shape of a cone with a central crater. Volcanic cones are of different types, depending upon the nature and size of the fragments ejected during the eruption. Types of volcanic cones include stratocones, spatter cones, tuff cones, and cinder cones. Stratocone Stratocones are large cone-shaped volcanoes made up of lava flows, explosively erupted pyroclastic rocks, and igneous intrusives that are typically centered around a cylindrical vent. Unlike shield volcanoes, they are characterized by a steep profile and periodic, often alternating, explosive eruptions and effusive eruptions. Some have collapsed craters called calderas. The central core of a stratocone is commonly dominated by a central core of intrusive rocks that range from around to over several kilometers in diameter. This central core is surrounded by multiple generations of lava f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Caldera
A caldera ( ) is a large cauldron-like hollow that forms shortly after the emptying of a magma chamber in a volcano eruption. When large volumes of magma are erupted over a short time, structural support for the rock above the magma chamber is gone. The ground surface then collapses into the emptied or partially emptied magma chamber, leaving a large depression at the surface (from one to dozens of kilometers in diameter). Although sometimes described as a Volcanic crater, crater, the feature is actually a type of sinkhole, as it is formed through subsidence and collapse rather than an explosion or impact. Compared to the thousands of volcanic eruptions that occur each century, the formation of a caldera is a rare event, occurring only a few times per century. Only seven caldera-forming collapses are known to have occurred between 1911 and 2016. More recently, a caldera collapse occurred at Kīlauea, Hawaii in 2018. Etymology The term ''caldera'' comes from Spanish language, S ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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