COSTA RICA 2021, SAN JOSÉ, CARTAGO, IRAZÚ VOLCANO, The Irazú Volcano is an active volcano in Costa Rica, situated in the Cordillera Central close to the city of Cartago.
The name could come from either the combination of “ara” and “tzu” or a corruption of Iztarú, which was the name of an indigenous village on the flanks of the volcano. In Costa Rica it is known by the name of “El Coloso” due to the catastrophes that it has provoked in the past.The volcano’s summit has several craters, one of which contains Diego de la Haya, a green crater lake of variable depth. At 11,260 feet, the Irazú Volcano is the highest active volcano in Costa Rica. It is easily visited from San José, with a road leading right up to the summit craters and a weekly bus service to the top. It is thus a popular tourist spot. The summit of the volcano also houses a few television transmitters for television stations in San José.
From the top it is possible to see both the Atlantic and Pacific Oceans on a clear day. However, such clear days are rare, and the volcano’s summit is usually cloud-covered.
The volcano is contained within the Irazú Volcano National Park, which spreads across 5,705 acres . The national park contains both primary and secondary montane forests and is home to armadillos, owls, rabbits, foxes, woodpeckers, and hummingbirds., The irazu volcano is a complex volcanic shield. It is the highest active volcano in Costa Rica, and has an area of 500 km2 . It has an irregular subconic shape, and temperatures at its summit vary between 3 and 17 °C , with a record low of −3 °C and a record high of 23.2 °C. Irazu volcano is a stratovolcano with a summit elevation of 3,432 metres . Its five craters are easily differentiated. The most important ones, because of their activity, are The Main Crater and the Diego de la Haya crater. The Main Crater is almost circular, has very inclined walls and it measures 1,050 metres in diameter and 300 metres deep. The Diego de la Haya crater is 600 metres in diameter and 100 metres deep. Other craters are Playa Hermosa, La Laguna, and El Piroclastico. Irazú is the southernmost of the ten Quaternary volcanoes which form a northwest-trending line through central and northern Costa Rica.Radioactive dating has shown an age of at least 854,000 years with eruption peaks at 570,000 years and the most recent active phase from 136,000 years to present. The most recent activity includes lava flows along with strombolian and phreatomagmatic explosions. Lava types include basalt and andesite erupted during different events suggesting the volcano is fed by two distinct magma chambers. Scientists believed that pulses of magma mixed together in the chamber before climbing upward—a process estimated to take several thousands of years. But Columbia University volcanologists found that the eruption of Costa Rica’s Irazu volcano in 1963 was likely triggered by magma that took a nonstop route from the mantle over just a few months. Study authors called it the highway from hell.