Fault maps of Oregon

By Robert Langridge, now of the USGS--formerly a Ph.D. student at the University of Oregon.

Quaternary fault map of the western half of Oregon, southern Washington, and northern California and Nevada, with historic macro-seismicity of the North American Plate with Magnitude. The behind-arc Cascade and Central Oregon Zones and Portland-St. Helens Zone of Pezzopane (1993) are highlighted.


Fault map of Oregon

Note here that faults are shown in different colors. The red ones are most recently active (younger than 10,000 years); green are younger than 700 ka; blue are younger thatn 1.6 Ma; black are older than 1.6 Ma--but still probably younger than about 5 Ma.