Almolonga
| Almolonga volcano | |
|---|---|
| (Cerro Quemado) | |
 The rounded hills in the middle, are part of a chain of lava domes of the Almolonga volcanic field | |
| Highest point | |
| Elevation | 3,197 m (10,489 ft) |
| Coordinates | 14°48′0″N 91°31′12″W / 14.80000°N 91.52000°WCoordinates: 14°48′0″N 91°31′12″W / 14.80000°N 91.52000°W |
| Geography | |
  Almolonga volcano Guatemala | |
| Location | Quetzaltenango, Guatemala |
| Parent range | Sierra Madre |
| Geology | |
| Mountain type | Stratovolcano |
| Last eruption | January to June 1818 |
The Almolonga volcano, usually called "Cerro Quemado" (Burned Mountain) is an andesitic stratovolcano in the south-western department of Quetzaltenango in Guatemala. The volcano is located near the town of Almolonga, just south of Quetzaltenango, Guatemala's second largest city.
The volcano is set along the Zunil fault zone and has a central caldera surrounded by several dacitic and rhyolitic lava domes and formed in a back-arc volcanic setting, with activity commencing 84,000BP. Almolonga stratovolcano is the oldest edifice and underwent collapse prior to the caldera forming eruption of Lake Atitlan, the major chronological marker of volcanism in the region. The collapse of the stratovolcano left a caldera with a diameter of 3,3 km and a depth of 350m that was subsequently occupied by lava domes on its northern edge and covered by tephra layers from numerous volcanoes, both in the Almolonga field and others. Cerro Quemado is the largest (about 2 km3) and youngest lava dome complex formed by eight vents with viscous lava flows and plugs during four distinct volcanic phases - the first two involving effusion of lava and formation of new domes. Cerro Quemado underwent a flank collapse 1,150BP, generating a landslide that went 6 km SSW in the Llano de Pilar valley and occupied an area of 13 km2, generating a lateral blast that affected the neighbouring Volcán Siete Orejas volcano as well. A lava dome emerged inside the collapse scar subsequently. 1818 an eruption formed a block lava flow over half a year that travelled 2.5 km eastward. Lahars and further explosive activity are potential hazards from this volcano.
See also
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References
- "Almolonga". Global Volcanism Program. Smithsonian Institution.
- Siebert, Lee; Kimberly, Paul; Pullinger, Carlos R. (1 January 2004). "The voluminous Acajutla debris avalanche from Santa Ana volcano, western El Salvador, and comparison with other Central American edifice-failure events". Geological Society of America Special Papers 375: 5–24. doi:10.1130/0-8137-2375-2.5. ISSN 0072-1077. Retrieved 19 July 2015.
- Michael Conway, F.; Vallance, James W.; Rose, William I.; Johns, Glen W.; Paniagua, Sergio (1992). "Cerro Quemado, Guatemala: the volcanic history and hazards of an exogenous volcanic dome complex". Journal of Volcanology and Geothermal Research 52 (4): 303–323. doi:10.1016/0377-0273(92)90051-E. ISSN 0377-0273.