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23-582: The Gastre Fault Zone ( GFZ ) is a NW-SE striking dextral Jurassic Gastre Fault System (cf. Rapela & Pankhurst, 1992) in Central Patagonia, Argentina. From a tentative correlation of the fault zone with the similarly NW-SE trend, it was termed ‘Gastre Fault Zone’ or ‘Gastre-Purén Fault Zone’ to the Lanalhue Fault Zone in Chile by early works. However, in later works it is shown that this correlation

46-407: A Multi-Component Gas Analyzer System , which detects pre-eruptive degassing of rising magmas, improving prediction of volcanic activity . Analysis of seismicity prior to the eruption show that there was no seismicity that could be reliably related to the upcoming eruption. However, a series of small earthquakes with hypocenters about 9 km beneath Villarrica volcano that occurred 45 days after

69-520: A large elliptical caldera of 6.5 and 4.2 km in diameter. During the Llanquihue glaciation Villarrica produced pyroclastic flow deposits, subglacial andesite lavas and dacite dykes. It collapsed once again 13,700 years ago forming a new smaller caldera, among other pyroclastic flows the Licán Ignimbrite has been related to this event. Beginning with the Licán Ignimbrite, generated just after

92-604: A yellow alert at both Servicio Nacional de Geología y Minería and Onemi . Minor explosions and low emissions of ashes were visible. Ten days later, another eruption occurred. The National Service of Geology and Mining (Sernageomin) declared a yellow alert after volcanic and seismic activity increased again, while the National Emergency Office of the Interior Ministry (ONEMI) kept the yellow alert. At approximately 03:01 AM on March 3, 2015, it erupted, raising

115-582: Is incorrect. Since the lake ‘Lago Lanalhue’, is located on the fault trace and shows a NW-SE-elongated shape, ‘Lanalhue Fault Zone (LFZ)’ stands as appropriate name for the here discussed fault zone. The Mocha-Villarrica Fault Zone is the NW-SE trending fault responsible for the alignment of Villarrica , Quetrupillán and Lanín volcanoes. This seismology article is a stub . You can help Misplaced Pages by expanding it . Villarrica (volcano) Villarrica, with its lava of basaltic - andesitic composition,

138-438: Is one of a small number worldwide known to have an active (but in this case intermittent) lava lake within its crater . The volcano usually generates strombolian eruptions with ejection of incandescent pyroclasts and lava flows. Rainfall plus melted snow and glacier ice can cause massive lahars (mud and debris flows), such as during the eruptions of 1964 and 1971. Villarrica is one of 9 volcanoes currently monitored by

161-478: Is thought that this decline could be a consequence of burial of gold placers beneath lahars associated with mid-16th century eruptions of Villarrica. This burial would have prompted settlers to move the city westward to its modern site, a place less prone to volcanic hazards . There are uncertainties in the eruptive record in the first half of the 17th century due to the Mapuche and Huilliche uprising which led to

184-642: The Deep Earth Carbon Degassing Project . The project is collecting data on the carbon dioxide and sulphur dioxide emission rates from subaerial volcanoes . Villarica stands just east of the Chilean Central Valley as the westernmost of an alignment of three large stratovolcanoes . The alignment is attributed to the existence of an old fracture in the crust, the North West-South East trending Mocha-Villarrica Fault Zone ,

207-536: The ablation of snow and ice by absorption of solar radiation . Some ash coverings are thicker than 5 cm and insulate the glacier, decreasing ablation instead of enhancing it. Between 1961 and 2003, Villarrica lost 25% of its glaciated surface and the glaciers shrank at an average rate of -0.4 km each year. Villarrica is popular for climbing with guided hikes to the crater from the town of Pucón, but these may be suspended due to cloud or volcanic activity. Helicopter over-flights have been available since 2007. In

230-449: The alert to red up to 10 kilometers around. The eruption exceeded the height of the volcano, causing a loud explosion that woke the neighbors, and forcing the evacuation of 3,385 people in nearby communities. The Southern Andean Volcano Observatory (OVDAS) indicated that a new imminent eruption would continue until 12:29 of March 19, 2015. As of July 2015, the eruption was continuing. Volcanic gas emissions from this volcano are measured by

253-458: The disaster claiming they had provoked it by cursing the town of Coñaripe. Such views reflect the belief that nature was "allied with the Indians". On 29 October 1971, at 3:00 am, there were several explosions in the crater and a column of white and then black smoke appeared. One month later, at quarter to midnight on 29 November, Villarrica began a new eruptive cycle. Pyroclasts were ejected and

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276-555: The eruption are thought to have been caused by the cooling of the eruption's feeder dykes . Centimetre A centimetre or centimeter ( US/Philippine spelling ), with SI symbol cm , is a unit of length in the International System of Units (SI) equal to one hundredth of a metre , centi being the SI prefix for a factor of ⁠ 1 / 100 ⁠ . Equivalently, there are 100 centimetres in 1 metre. The centimetre

299-420: The eruption had definitely turned effusive by May 21. The last consequences of this cycle of eruptions were lahars that flowed down the volcano on May 24. In the two last weeks of February 1964, Villarrica produced small, violent lava effusions and tremors. On 2 March, at 2:45 am, it began a strombolian eruption , and residents of Coñaripe , a wood-logging town, fled to the surrounding hills. At some point,

322-478: The inhabitants of Coñaripe decided to return to their houses in search of shelter from the heavy rainfall. At midnight a new lava flow advanced downhill melting snow and ice triggering five lahars. Melting snow and ice from the Pichillancahue-Turbio Glacier combined with heavy rainfall to produce several lahars . This situation caught Coñaripe residents unprepared when one of the lahars overwhelmed

345-399: The last deglaciation, activity continued in similar fashion. The Pucón Ignimbrite was ejected during a minor collapse of the uppermost stratocone 3,700 years ago. The upper part of Villarrica is permanently covered by snow and has some 40 km of glaciers , the largest of which is the Pichillancahue-Turbio Glacier situated on its southeastern flank. Ash from the eruptions can increase

368-448: The other volcanoes in the chain, Quetrupillán and Lanín , are far less active. The alignment is unusual as it crosses the N-S running Liquiñe-Ofqui Fault , along which several active volcanoes are aligned. Villarrica covers an area of 400 km and has an estimated volume of 250 km . It contains volcanic caves and about 26 scoria cones . The constant degassing at the lava lake turns

391-566: The otherwise quite effusive lava more viscous, heightening its explosive potential. Two large ignimbrite layers are visible; the Licán Ignimbrite and the more recent Pucón Ignimbrite. Villarrica emerged during the Middle Pleistocene and grew forming a large stratocone of similar dimensions to the current edifice. 100,000 years ago during the Valdivia Interglacial the ancestral Villarrica collapsed following an eruption and formed

414-427: The site of present-day Pucón . Villarrica volcano had frequent strombolian eruptions in the second half of the 16th century. Peaks of activity occurred in 1558 and 1562. The 1562 eruption in particular deposited thin ash layers as far as 200 km away from the volcano. During its early years the city of Villarrica was an important gold and silver mining centre. However mining activity declined over time. It

437-594: The snow surrounding the crater melted. After a brief halt in activity lava poured from a new vent on the north-east side, melting considerable amounts of water and causing lahars . These lahars affected Pichaye, El Turbio, Collentañe, Minetué, Molco, Voipir and Curarrehue , all of them in the Trancura River basin. Toxic sulphurous gases made the air unbreathable in Villarrica and Pucón where at least 15 deaths were reported. On February 7, 2015, Villarrica triggered

460-530: The surrender or abandonment of Spanish settlements during the destruction of the Seven Cities . The volcano resumed eruptive activity on March 8, 1963. On March 12 a flank vent some 250 metres below the summit begun to pour lava that ended up making a 1000 m long and 150-meter broad lava flow. The lava flow had stopped by March 19. Concurrently with this the summit crater continued its strombolian eruption. Explosive eruptions begun once again on May 2, 1963, and

483-430: The town killing 27 residents. The hamlet of Chaillupén was also destroyed by the lahar meaning 30 houses were destroyed, however, there were no deaths. Other lahars that flowed north destroyed various bridges between Villarrica and Pucón before entering Villarrica Lake . The sudden inflow of lahars into Villarrica Lake caused the water level to rise, flooding some low-lying pastures. Some Mapuches blamed settlers for

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506-466: The winter (July–September) a ski resort operates on the northern slopes. The youngest person to reach the summit recognized by the Chilean government was Christopher Heussner of Texas at the age of 9 in 1999. Villarrica is one of Chile's most active volcanoes; eruptions have been recorded since the conquest of Chile and the founding of the city of Villarrica in 1552. This city was originally founded near

529-413: Was the base unit of length in the now deprecated centimetre–gram–second (CGS) system of units. Though for many physical quantities, SI prefixes for factors of 10 —like milli- and kilo- —are often preferred by technicians, the centimetre remains a practical unit of length for many everyday measurements; for instance, human height is commonly measured in centimetres. A centimetre is approximately

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