Active Tectonics of the Devils Mountain Fault and Related Structures, Northern Puget Lowland and Eastern Strait of Juan De Fuca Region, Pacific

by Samuel Johnson (Editor)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 2001-06 edition. ...10, 13) suggest that the Strawberry Point fault changes from a discrete fault into a broad fault zone as it crosses Whidbey Island from west to east (figs. 2, 27, 28). On central Whidbey Island, the trace of this zone is covered by vegetation and surficial deposits developed mainly on Vashon Drift and recessional outwash (Pessl and others, 1989). There are no obvious topographic lineaments associated with the fault zone on existing topographic maps in this area. Furthermore, the number of deep water wells flanking the Strawberry Point fault in this area is insufficient to construct stratigraphic correlation diagrams either parallel to or across the fault in order to constrain fault location or slip. The location of the fault zone and its components on central Whidbey Island is thus somewhat speculative, and is based primarily on aeromagnetic data (fig. 3; Blakely and Lowe, 2001). East Coast of Whidbey Island Seismic-reflection data (fig. 8) suggest that the Strawberry Point fault is a zone comprising several splays along Strawberry Point on the east coast of Whidbey Island. Within this zone, there is significant deformation of upper Pleistocene strata discontinuously exposed in coastal bluffs (fig. 31). There are also a significant number of lithologic logs from water wells adjacent to the coastline (table 1, fig. 28). Together, the outcrops, lithologic logs, and seismic-reflection profiles provide the data needed for a stratigraphic correlation diagram across Strawberry Point that provides some constraints on fault-zone interpretation (fig. 32). Easterbrook (1968), Hansen and Easterbrook (1974), and Blunt and others (1987) have described aspects of the stratigraphy and palynology of the nonglacial Olympia beds exposed at Strawberry Point, and...

45 pages, Hardcover

First published January 1, 2001

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