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CALIFORNIA

MAP SHOWING KNOWN OR SUSPECTED FAULTS WITH QUATERNARY DISPLACEMENT IN THE PACIFIC NORTHWEST

By

Lambert Conformal Conic Projection
‘Standard Parallels 41°30' and 50°30"

Base from Juan de Fuca Plate JFP1, JFP2, and JFP3 maps, scale 1:2,000,000, 1978
Printed by the Surveys and Mapping Branch, Department of Energy, Mines and

EXPLANATION

—+— Mapped fault with known or suspected Quaternary

rupture—Sawteeth on upper plate

a Fault inferred from seismicity

-+ Geophysical lineament

— Geophysical lineament inferred to be a fault

20 Principal reference describing the structure—See

reference list

SCALE 1:2 000 000
50. 100 150

200 KILOMETERS

CONTOUR INTERVAL 500 METERS
BATHYMETRIC CONTOURS 200 METERS
NATIONAL GEODETIC VERTICAL DATUM OF 1929

Albert M. Rogers, Timothy J. Walsh, William J. Kockelman, and George R. Priest

1996

(2c0 )
78

no. 1560
C2

Seo.

PROFESSIONAL PAPER 1560
PLATE 1

The numbers accompanying structures are indexed to the references. Offshore faults shown on this map do not
necessarily cut reflectors interpreted to be Quaternary in age because ruptures on blind thrusts do not reach the surface
(S.H. Clarke, U.S. Geological Survey, oral commun., 1991). Inclusion of a structure on this map does not necessarily
imply that it is seismogenic. Many of these faults, particularly offshore, probably represent secondary rupture, possibly
during subduction-zone events. The variation in frequency of faulting in the different States is partly geologic but also
reflects disparities in the extent of field studies due to funding differences among the States. In Oregon, faults
documented in Pezzopane and Weldon (1993) and Pezzopane (1993) are shown only if Quaternary deformation is
documented; otherwise, many more faults and lineaments could be shown.

i

2:

5, a, b.

5a.

5b.

10.

alas

12.

1S)

13a.

14,

15.

16.

As

18.

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AiO}

20.

PAG

22.

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25,

26.

275

28.

29.

30.

3h.

32.

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34.

35.

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