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Pululahua
Pululahua is a dormant volcano in the north of Quito Canton, Pichincha Province, Ecuador. The volcano is in the Western Cordillera of the northern Ecuadorian Andes, approximately west-southwest of Mojanda and north of Casitahua volcanoes. Pululahua's caldera is approximately 5 km wide.The volcano is within an Ecuadorian national park known as Reserva Geobotánica Pululahua.
Volcanism at Pululagua is the result of subduction as the Nazca plate subducts under the South American plate. Research show that past eruptions were large and violent, with the last eruption taking place in 290 CE. Past eruptions have deposited ash between 10 and 1000 m thick.
In 467 BCE, Pululahua erupted, sending volcanic ash over much of the western Ecuadorian lowland regions, which greatly reduced the expressions of the Chorrera and Cotocollao cultures.
Past eruptive events have been broken down into four main eruptive units:
(Data below references)
After initial volcanism, volcanic activity largely ceased for around 9 ka (~11-2.5 ka). The one exception was a minor event ~6 ka.
Even though Pululahua has not erupted in almost 2,000 years, CO2 data shows an active magma chamber still exists under the volcano. Taking 350 soil samples from 3.36 square kilometers on the caldera floor, large amounts of CO2 is being degassed at around about 59–97 tonnes per day. This also poses a risk to animals and humans living in the caldera.
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Pululahua
Pululahua is a dormant volcano in the north of Quito Canton, Pichincha Province, Ecuador. The volcano is in the Western Cordillera of the northern Ecuadorian Andes, approximately west-southwest of Mojanda and north of Casitahua volcanoes. Pululahua's caldera is approximately 5 km wide.The volcano is within an Ecuadorian national park known as Reserva Geobotánica Pululahua.
Volcanism at Pululagua is the result of subduction as the Nazca plate subducts under the South American plate. Research show that past eruptions were large and violent, with the last eruption taking place in 290 CE. Past eruptions have deposited ash between 10 and 1000 m thick.
In 467 BCE, Pululahua erupted, sending volcanic ash over much of the western Ecuadorian lowland regions, which greatly reduced the expressions of the Chorrera and Cotocollao cultures.
Past eruptive events have been broken down into four main eruptive units:
(Data below references)
After initial volcanism, volcanic activity largely ceased for around 9 ka (~11-2.5 ka). The one exception was a minor event ~6 ka.
Even though Pululahua has not erupted in almost 2,000 years, CO2 data shows an active magma chamber still exists under the volcano. Taking 350 soil samples from 3.36 square kilometers on the caldera floor, large amounts of CO2 is being degassed at around about 59–97 tonnes per day. This also poses a risk to animals and humans living in the caldera.