ACTIVE TECTONICS OF THE SEATTLE FAULT AND CENTRAL PUGET SOUND, WASHINGTON — IMPLICATIONS FOR EARTHQUAKE HAZARDS

Schematic geologic map of northwestern Washington showing the Puget Lowland and flanking Cascade Mountains, Coast Range, and Olympic Mountains

Figure 1. Schematic geologic map of northwestern Washington showing the Puget Lowland and flanking Cascade Mountains, Coast Range, and Olympic Mountains. Abbreviations for cities: O = Olympia; S = Seattle; T = Tacoma; VI = Victoria. Abbreviations for faults (heavy lines), modern Cascade volcanoes (triangles) and other geologic features: BH = Black Hills; CBF = Coast Range Boundary fault; DAF = Darrington fault; DF = Doty fault; DMF = Devils Mountain fault: GP = Glacier Peak; HC = Hood Canal; LRF = Leech River fault; MA = Mount Adams; MB = Mount Baker; MR = Mount Rainier; MSH = Mount Saint Helens; SB = Seattle basin; SCF = Straight Creek fault; SF = Seattle fault; SHZ = Saint Helens zone; SJ = San Juan Islands; SJF = San Juan fault; SWF = southern Whidbey Island fault. Geology from maps and compilations of Tabor and Cady (1978), Washington Public Power Supply System (1981), Gower and others (1985), Walsh and others (1987), Whetten and others (1988), Yount and Gower (1991), Tabor and others (1993), and Tabor (1994).

Last modified Thursday, March 29, 2001