2.12 Earthquakes in the Pacific Northwest: the Cascadia Subduction Zone and Juan de Fuca Plate Seismic studies have shown that the Cascadia subduction zone exhibits less earthquake activity than any other subduction zone along the margin of the Pacific basin. …

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2.11-B Mantle Convection: Buoyancy and Uplift: Vertical Movements of the Crust Mantle convection is a cause of vertical crustal movement. Based on studies of Earth’s gravitational field, it became clear that up and down convective flow in the mantle also …

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2.11-A Uplift, Isostasy, and Isostatic Adjustment : Vertical Movements of the Crust In addition to the large crustal displacement driven mainly by plate tectonics, gradual up-and-down motions of the continental crust are observed at many locations around the globe. Although …

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2.10 Basin and Range Province of Nevada, Fault Block Mountains: Plate Tectonics Most mountain belts, including the Alps, Himalayas, and Appalachians, form in compressional environments, as evidenced by the predominance of large thrust faults and folded strata. However, other tectonic …

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2.9B Accretion and Orogeny: Definition of Orogenesis: Western Pacific to Alaska Orogenesis includes the processes that collectively result in the formation of mountains. Some mountain belts develop as a result of the collision and merger of an island arc, or …

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