Antuco Volcano is a stratovolcano located in the Bío Bío Region of Chile , near Sierra Velluda and on the shore of Laguna del Laja .
7-501: The first registered eruption occurred in 1624 but it is known that the volcano experienced some activity in the 16th century. The 1624 eruption was strombolian forming a lava flow and resulting in the ejection of pyroclasts . Beginning with this eruption many more were recorded as the volcano lies near an Andean mountain pass transited by the Spanish. In April 2013, there were reported signs of activity sighted by nearby inhabitants -
14-479: A Volcanic Explosivity Index of 1 or 2. Strombolian eruptions consist of ejection of incandescent cinders , lapilli , and volcanic bombs , to altitudes of tens to a few hundreds of metres. The eruptions are small to medium in volume, with sporadic violence. This type of eruption is named for the Italian volcano Stromboli . The tephra typically glows red when leaving the vent, but its surface cools and assumes
21-436: A dark to black colour and may significantly solidify before impact. The tephra accumulates in the vicinity of the vent, forming a cinder cone . Cinder is the most common product; the amount of volcanic ash is typically rather minor. The lava flows are more viscous , and therefore shorter and thicker, than the corresponding Hawaiian eruptions ; it may or may not be accompanied by production of pyroclastic rock . Instead
28-508: A pilot even reported ash spewing from the volcano. The Volcanic Ash Advisory Center in Buenos Aires, Argentina, investigated and determined that only trace gases and steam had emerged from Antuco. This Biobío Region location article is a stub . You can help Misplaced Pages by expanding it . Strombolian In volcanology , a Strombolian eruption is a type of volcanic eruption with relatively mild blasts, typically having
35-772: The "Lighthouse of the Mediterranean". The most energetic Strombolian eruptions are sometimes termed "Violent Strombolian" by volcanologists. Such eruptions are associated with higher magma gas content, leading to a turbulent churn flow regime in the conduit, producing stronger and much more frequent explosions. Violent Strombolian eruptions are more explosive in nature than their regular counterparts (up to VEI 3), and may produce sustained lava fountains, long distance lava flows, eruption columns several kilometres in height, and heavy ash fallout. Rarely, Violent Strombolian eruptions may transition into Subplinian eruptions . Examples of Violent Strombolian activity include
42-597: The conduit system is not strongly affected by the eruptive activity, so that the eruptive system can repeatedly reset itself. Monogenetic cones usually erupt in the Strombolian style. For example, the Parícutin volcano erupted continuously between 1943–1952, Mount Erebus , Antarctica has produced Strombolian eruptions for at least many decades, and Stromboli itself has been producing Strombolian eruptions for over two thousand years. The Romans referred to Stromboli as
49-432: The gas coalesces into bubbles, called gas slugs , that grow large enough to rise through the magma column, bursting near the top due to the decrease in pressure and throwing magma into the air. Each episode thus releases volcanic gases, sometimes as frequently as a few minutes apart. Gas slugs can form as deep as 3 kilometers, making them difficult to predict. Strombolian eruptive activity can be very long-lasting because
#975024