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Isla Tortuga volcanoshield volcano 210+ m / 689 ft
Baja California, Mexico, 27.43°N / -111.88°W Current status: dormant (1 out of 5) [hide map] [enlarge map]
Typical eruption style: effusive
Isla Tortuga volcano eruptions: unknown, less than 10,000 years ago Last earthquakes nearby:
The volcano has a circular summit caldera, about 100 m deep, containing a frozen lava and several cinder cones from probably relatively recent eruptions. Young lava flows cover most of the volcano's flanks. At present, there is fumarolic activity. Background:The shield volcano was constructed during 2 north-migrating periods of activity that began with submarine eruptions and included formation of a circular tuff-ring complex enclosing the caldera.The sides of a small volcanic horst in the center of the caldera display lava flows overlying a 2-m-thick halite bed, formed when sea water filled the caldera, creating an evaporite basin. |
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