Andahua-Orcopampa Volcano - John Seach



15.42 S, 72.33 W
summit elevation 4713 m
cinder cones

Andahua monogenetic field is a scoria and lava field extending over an area of about 50 km×30 km ENE of the Nevados de Coropuna complex of stratovolcanoes. The field is situated inside the Andahua Valley.

Andahua–Orcopampa monogenetic field is located in and along the margins of a series of NNW–SSE trending enechelon valleys: Orcopampa, Andahua and Ayo valleys.

The Andahua–Orcopampa volcanic province is located in the Western Cordillera. This magmatic arc is composed of andesitic to dacitic composite volcanoes about 120–130 km above the Wadati–Benioff zone and built on 60–80 km thick crust.

In the Orcopampa–Andahua valleys, more than 40 cones are located in an area covering 240 sq km (40 km x 6 km). They are associated with large lava flows, which cover more than 50% of the valley floor.

Monogenetic scoria and cinder cones (200–300 m high and 500–650 m across) are the main volcano type in the Andahua–Orcopampa field. Most cones lie on the valley floors.

Eruptions of Andahua-Orcopampa Volcano
Some cones may have been active in historical times as one ashfall layer of Jenchaña cinder cone is covered by ash from Huaynaputina eruption in 600 AD.

Andahua-Orcopampa Volcano Eruptions

1913?, 1490 ± 40, 940 BC ± 100, 2110 BC ± 50.