[Map,27K,InlineGIF]
Active Volcanoes, Plate Tectonics, and the "Ring of Fire"
-- Modified from: Tilling, Heliker, and Wright, 1987, and Hamilton, 1976

[Map,13K,InlineGIF]
Active Volcanoes and Plate Tectonics
-- Smaller version of above map -- Modified from: Tilling, Heliker, and Wright, 1987, and Hamilton, 1976

[Map,30K,InlineGIF]
Earthquakes and Plate Tectonics -- Earthquakes around the world for the past 5 years as of July 7, 1999. The distribution of seismicity over the past 5 years defines boundaries of tectonic plates.
-- "Flat" color version

[Map,115K,InlineGIF]
Earthquakes and Plate Tectonics -- Earthquakes around the world for the past 5 years as of July 7, 1999. The distribution of seismicity over the past 5 years defines boundaries of tectonic plates.
-- "Topographic" version

[Map,35K,InlineGIF]
Earthquakes, Active Volcanoes, and Plate Tectonics -- Earthquakes around the world compared to plate boundaries and the "Ring of Fire"

[Map,20K,InlineGIF]
Plate Tectonics and the Cascade Range
-- Modified from: Tilling, 1985

[Map,11K,InlineGIF]
Juan de Fuca Ridge - Gorda Ridge - Axial Seamount -- showing features of Pacific/Juan de Fuca/North American subduction system relative to Western United States. Open blue arrows, ridge-spreading directions; solid blue arrow, convergence direction.
-- Modified from: Swanson, et.al., 1989, IGC Field Trip T106: Cenozoic Volcanism in the Cascade Range and Columbia Plateau, Southern Washington and Northernmost Oregon, p.2

[Map,21K,InlineGIF]
Juan de Fuca Subduction - Juan de Fuca Ridge - Cascade Range
-- Modified from Brantley, 1994, USGS General Interest Publication 376-846

[Map,10K,InlineGIF]
South America:
Active Volcanoes, Plate Tectonics, and South America
-- Modified from: Tilling, Heliker, and Wright, 1987, and Hamilton, 1976 ...

[Map,37K,InlineGIF]
Canada:
Volcanoes and Volcanic Areas of Western Canada
-- Modified from: Canada Natural Resources, Geological Survey of Canada, Volcanoes of Canada, 2001, and C. J. Hickson, 1990, IN: Wood and Kienle

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