Benchamrks: December 4, 1992: The Seattle Fault Zone is described

Since the early 1900s, scientists, boaters and residents have known that a ghostly, submerged forest of dead trees lurked just below the surface of Lake Washington, on Seattle’s eastern edge. The trees were mostly too deep to bother anyone until the Lake Washington Ship Canal opened in 1916, connecting the lake and Puget Sound and dropping the level of the lake three meters. Then the dead trees — many of which were still upright — became hazardous to boaters. In response, the U.S. Coast and Geodetic Survey and U.S. Army Corps of Engineers blasted and chained down 186 trees in one submerged forest. Forty years later, when a diver visited a different underwater forest in 28 meters of water, he found himself in a dense grove of dead trees — predominately Douglas fir — the largest of which had a circumference of 9 meters. 
 

Full content for EARTH is available to subscribers. If you would like to gain access to the full version of this article, as well as all EARTH content, please subscribe today.

If you are connecting using a Library (IP-based) Subscription, please access full issues of the magazine through our Library Access portal.

David B. Williams

EARTH contributor

Tuesday, December 4, 2012 - 06:00