Fig. 1
From: Isolating non-subduction-driven tectonic processes in Cascadia
Maps outlining the active tectonic processes, faults and geologic terranes in Cascadia. a Map of the tectonic processes and their respective kinematics acting across Cascadia. Schematic vector triangles show how the velocity fields produced by subduction coupling (VCSZ) and NNW-directed processes (specifically the MCC and SNGV-block motion (VNNW)) are superimposed in the Cascadia GPS velocity field (VOBS). The black polygon outlines the focus region of this study. b Map of active faults within the upper-plate in southern Cascadia (USGS 2020). White dashed lines outline upper-plate faults (Wells et al. 2017; Kirby et al. 2020) that bound an area of high relief from ~ 42° N to ~ 43° N. The upper-plate topographic relief (calculated over a radius of 1 km) is shown in the background (calculated from the 30 m resolution SRTM digital elevation model (Farr et al. 2007)). The Klamath terrane is outlined in black. c Plot of present-day uplift rates from GPS data (from 124.8° W to 123.6° W) (Blewitt et al. 2018) and bench mark leveling data (Burgette et al. 2009) in southern Cascadia. WLB: Walker Lane Belt, ECSZ: Eastern California Shear Zone, CNSB: Central Nevada Seismic Belt, WGB: Western Great Basin, CGB: Central Great Basin, MTJ: Mendocino Triple Junction, Nam: North America plate, SNGV: Sierra Nevada–Great Valley, MCC: Mendocino Crustal Conveyor, Pac: Pacific plate, JF: Juan de Fuca plate