Stratovolcano

GEOTHERMAL ENERGY

Stratovolcano:

Stratovolcanoes, also known as composite volcanoes, are conical volcanoes composed of multiple layers of intermediate to felsic lava, ash, and other volcanic debris. Their steep profiles are the result of the high viscosity of less mafic lavas, which prevents them from flowing great distances during eruption and cooling. Stratovolcanoes are commonly encountered in chains adjacent to subduction zones, where dewatering of the subducting slab and melting of the slab and overlying mantle rocks leads to magma generation.

Other definitions:Wikipedia Reegle

Schematic representation of the internal structure of a typical stratovolcano.

Topographic Features

List of topographic features commonly encountered in geothermal resource areas:

• Mountainous
• Horst and Graben
• Shield Volcano
• Flat
• Lava Dome
• Stratovolcano
• Cinder Cone
• Caldera Depression
• Resurgent Dome Complex

"Some of the Earth's grandest mountains are composite volcanoes-sometimes called stratovolcanoes. They are typically steep-sided, symmetrical cones of large dimension built of alternating layers of lava flows, volcanic ash, cinders, blocks, and bombs and may rise as much as 8,000 feet above their bases. Some of the most conspicuous and beautiful mountains in the world are composite volcanoes, including Mount Fuji in Japan, Mount Cotopaxi in Ecuador, Mount Shasta in California, Mount Hood in Oregon, and Mount St. Helens and Mount Rainier in Washington.

Most composite volcanoes have a crater at the summit which contains a central vent or a clustered group of vents. Lavas either flow through breaks in the crater wall or issue from fissures on the flanks of the cone. Lava, solidified within the fissures, forms dikes that act as ribs which greatly strengthen the cone.

The essential feature of a composite volcano is a conduit system through which magma from a reservoir deep in the Earth's crust rises to the surface. The volcano is built up by the accumulation of material erupted through the conduit and increases in size as lava, cinders, ash, etc., are added to its slopes."

Examples

Want to add an example to this list? Select a Geothermal Resource Area to edit its "Topographic Features" property using the "Edit with Form" option.

CSV

Geothermal Resource Area	Geothermal Region	Tectonic Setting	Host Rock Age	Host Rock Lithology	Mean Capacity	Mean Reservoir Temp
Ogiri Geothermal Area	Ryuku Arc	Subduction Zone	Quaternary	Andesite	30 MW30,000 kW <br />30,000,000 W <br />30,000,000,000 mW <br />0.03 GW <br />3.0e-5 TW <br />	533.15 K260 °C <br />500 °F <br />959.67 °R <br />
Oguni Geothermal Field	Japan: Energy Resources	Subduction Zone			2 MW2,000 kW <br />2,000,000 W <br />2,000,000,000 mW <br />0.002 GW <br />2.0e-6 TW <br />	475.15 K202 °C <br />395.6 °F <br />855.27 °R <br />
Rincon De La Vieja Geothermal Resource Area	Rincon De La Vieja	Subduction Zone		Andesite	42 MW42,000 kW <br />42,000,000 W <br />42,000,000,000 mW <br />0.042 GW <br />4.2e-5 TW <br />	533.15 K260 °C <br />500 °F <br />959.67 °R <br />
Takigami Geothermal Area	Ryuku Arc	Extensional Tectonics Subduction Zone	Tertiary	Andesite	28 MW28,000 kW <br />28,000,000 W <br />28,000,000,000 mW <br />0.028 GW <br />2.8e-5 TW <br />	478.15 K205 °C <br />401 °F <br />860.67 °R <br />
Yamagawa Geothermal Area	Ryuku Arc	Subduction Zone	Neogene to Recent	Volcanics	30 MW30,000 kW <br />30,000,000 W <br />30,000,000,000 mW <br />0.03 GW <br />3.0e-5 TW <br />