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An estimate based on volume (588 km 3) and eruption rates suggest that Sierra Negra is approximately 535,000 years old. [2] The morphology of Sierra Negra is the upturned soup bowl shape of the other Isabela volcanoes, however it does not have the steep sloping sides that are on others.
An eruption occurred between 1946 and 1960, as determined from variation in photographs. Another eruption in 1954 is now believed to have taken place on neighbouring Sierra Negra. Even the 1993 eruption was not observed at the time and only recorded after an expedition discovered new craters in 1995. [14]
Sierra Negra (also, and perhaps more properly, Cerro La Negra) is an extinct volcano located in the Mexican state of Puebla, close to the border with Veracruz. At officially 4,580 metres (15,030 ft) above sea level, it is the fifth-highest peak in Mexico. Sierra Negra is overshadowed by nearby Pico de Orizaba (5,610 m/18,406 ft).
Sierra Negra on Isabela Island experienced a 240 cm (94 in) uplift between 1992 and 1998, most recent eruption in 2005, while Fernandina on Fernandina Island indicated an uplift of 90 cm (35 in), most recent eruption in 2009. Alcedo on Isabela Island had an uplift of greater than 90 cm, most recent eruption in 1993.
Last Eruption El Altar / Kapak Urku: 5405: 17,730 Unknown Antisana: 5753 ... Sierra Negra: 1124: 3687 2018 Wolf: 1710: 5609 ...
There was an eruption between 1946 and 1960, as determined from variation in photographs. Another eruption in 1954 is now believed to have taken place on neighbouring Sierra Negra. Even the 1993 eruption was not observed at the time and only recorded after an expedition discovered new craters in 1995 [1]
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The Galapagos hotspot has a very complicated tectonic setting. It is located very close to the spreading ridge between the Cocos and Nazca plates; the hotspot interacts with both plates and the spreading ridge over the last twenty million years as the relative location of the hotspot in relation to the plates has varied.