Olca
Encyclopedia
Olca is a stratovolcano
on the border of Chile
and Bolivia
. It lies in the middle of a 15 km long ridge composed of several stratovolcanos. Cerro Minchincha
lies to the west and Paruma
to the east. It is also close to the pre-Holocene
Cerro Paruma. It is andesitic and dacitic in composition, with lava flows extending several kilometres north of the peak. The only activity from the ridge during historical times was a flank eruption from 1865 to 1867. The exact source of this eruption is unclear.
Stratovolcano
A stratovolcano, also known as a composite volcano, is a tall, conical volcano built up by many layers of hardened lava, tephra, pumice, and volcanic ash. Unlike shield volcanoes, stratovolcanoes are characterized by a steep profile and periodic, explosive eruptions...
on the border of Chile
Chile
Chile ,officially the Republic of Chile , is a country in South America occupying a long, narrow coastal strip between the Andes mountains to the east and the Pacific Ocean to the west. It borders Peru to the north, Bolivia to the northeast, Argentina to the east, and the Drake Passage in the far...
and Bolivia
Bolivia
Bolivia officially known as Plurinational State of Bolivia , is a landlocked country in central South America. It is the poorest country in South America...
. It lies in the middle of a 15 km long ridge composed of several stratovolcanos. Cerro Minchincha
Cerro Minchincha
Cerro Minchincha is a stratovolcano on the border of Bolivia and Chile. It is part of an east-west trending ridge of stratovolcanoes. To its east lies Olca. The only historical activity from the complex was a flank eruption from 1865-1867....
lies to the west and Paruma
Paruma
Paruma is a stratovolcano that lies on the border of Bolivia and Chile. It is part of a ridge that contains several stratovolcanos. Paruma lies at the eastern end of the ridge, with Olca to its west. The older volcano Cerro Paruma lies to east of Paruma. Paruma has clearly been active during the...
to the east. It is also close to the pre-Holocene
Holocene
The Holocene is a geological epoch which began at the end of the Pleistocene and continues to the present. The Holocene is part of the Quaternary period. Its name comes from the Greek words and , meaning "entirely recent"...
Cerro Paruma. It is andesitic and dacitic in composition, with lava flows extending several kilometres north of the peak. The only activity from the ridge during historical times was a flank eruption from 1865 to 1867. The exact source of this eruption is unclear.