Page 184 - Global Tectonics

170 CHAPTER 7

(a)

40°N

39°N

115°W 114°W 113°W 112°W 111°W
(b) EGAN Snake Range FOOT SMEL CAST
Detachment reflector "F"
0 SRF Joes 0
Depth, km 10 MOHO Egan Range f. House Range f. MOHO Wasatch fault Gunnison f. Valley 10
Sevier Desert d.
Fault
20
Spring Valley f.
20
30 30
I I' II II' III III' IV IV'
kilometers
0 25 50 75 100
Egan Range Fault Spring Valley Fault
(c) (d) (e)
Two-way time (sec) 10 5 12 12 4 8
4
8

(f) I NEVADA LINES N4 AND 5N I 15 III UTAH LINE U3 III IV UTAH LINE U4 IV
Clear Lake Sevier Desert
Snake Range Fault House Range Fault Reflector “F” Scarps Detachment
Two-way time (sec) 12 4 8

UTAH LINE U1
II
II
Figure 7.14 (a) Shaded relief map of a part of the eastern Basin and Range showing range-bounding faults and

locations of seismic reflection profiles (black dashed lines) and GPS sites (white triangles) (image provided by N. Niemi

and modified from Niemi et al., 2004, with permission from Blackwell Publishing). High-angle faults show ball and bar
symbol in the hanging wall, low-angle faults show hachured pattern. Faults mentioned in the text include the Egan
Range Fault (ERF), the Spring Valley Fault (SVF), the Sevier Desert Detachment (SDD), the Wasatch Fault Zone (WFS,

WLS, WNS, WPS), and the Snake Range Detachment (SRD). Cross-section (b) constructed using seismic reflection data
from (c) Hauser et al., 1987 and (d) Allmendinger et al., 1983 (with permission from the Geological Society of America).
(e,f) Allmendinger et al., 1986 (redrawn from Allmendinger et al., 1986, by permission of the American Geophysical
Union. Copyright © 1986 American Geophysical Union). SR, Snake Range Metamorphic Core Complex.