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Figure 15. Faults in Washington that are known to be active or thought to have been active in the last 10,000 years. Solid lines indicate faults well documented by geo logic or seismic data; dotted lines show faults of uncertain age thought to have been active in recent ge ologic time; dashed line shows the surface trace of the Cascadia subduction zone. Sources of information ab out the faults are tabulated below:

Calawah - Howard and others, 1978
Saddle Mountain East - Wilson and others, 1979
St. Helens Seismic Zone - Weaver and Smith, 1983
Toppenish Ridge - Campbell and Bentley, 1983
Mount Rainier - Crosson and Frank, 1975
Straight Creek - Slemmons and others, 1981 Vance and Miller, 19 83

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