BackgroundThe lineament (also known as the La Joya alignment, after La Joya explosions craters SW of Granada) is similar to Nejapa-Miraflores alignment and cuts across the flanks of Apoyo caldera only 2 km from its rim.
The volcanic system has erupted basaltic lavas and tephras similar to those from mid-ocean ridges. A series of interconnecting collapse-explosion pits lies immediately east of the Granada cinder cone alignment.
Apoyo caldera (Laguna Apolyo) near Granada is a lake-filled, nearly circular 7x6.5 km wide and at least 600 m deep caldera in western Nicaragua between Lakes Managua and Nicaragua. It belongs to Nicaragua's NW-SE chain of young volcanoes and is located at the western margin of the Nicaraguan depression, a broad shallow NW-SE oriented graben.
The caldera formed during at least 2 plinian eruptions beginning about 23,000 years ago and erupted about 7-11 cubic km of dacitic pumice and ash in a sequence of fall and flow deposits. The eruptions that produced the Apoyo caldera represent the largest silicic eruptions known in Nicaragua during the Quarternary (past 2.5 million years).
- Smithsonian / GVP volcano information
- Sussman D (1985) "Apoyo Caldera, Nicaragua: a major Quaternary silicic eruptive center", J Volc Geotherm Res, v 24, pp. 249-282
Mombacho stratovolcano, view from Granada, Nicaragua (Photo: WNomad)
Mombacho stratovolcano, near Granada, Nicaragua (Photo: WNomad)
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