Page 114 - Whole Earth Geophysics An Introductory Textbook For Geologists And Geophysicists

of the
line
single, hori-
for
sketch:
refracted
following
97
distance;
fronts
refraction
velocity
Exercises
model
critical
critically
the
wave
Sketch a
plot
the
of
P-wave
d)
graph: h)
length
On
and
P-waves;
f)
craton.
mantle.
P-wave;
and
times
approximate
the
thickness
continental
reflected
travel
uppermost
on
direct
illustrate
Compute
approximate
e)
k)
and
distance;
a
graph:
of the
across
and
refracted,
P-waves.
Calculate
distance
velocity
run
crossover
a)
showing:
is
critically
line
refracted
P-wave
vs.
P-wave.
refraction
time; j)
time
model
direct,
approximate
travel
critically
reflected
intercept
interface
for
hypothetical
a
raypaths
on
g)
and
crust; b)
i) T-axis
P-wave;
arrivals
zontal
direct
c)
A
EXERCISES
4-1
g depth. Moho the resolve to necessary con- passive of a plain coastal the strike, on along run is line refraction hypothetical A 4-2 “normal” and continental “normal” between is thickness Crustal margin. tinental multiple, hori- a thick. Sketch km 5 approximately is section sedimentary oceanic. The 500 km showing: model interface zontal crys- and strata sedimentary
and Range Province 6.0 Sin 2 72 82 ys km 400 Po "Exotic" km 400 the structure and Cenozoic tectonics ed. by D. C.

Basin —_ SE Mountains, extending into the Cordillera, from Triimpy Union, Washington,
aac Upper Crust Lower Crust ai 400 & -™ 59 _—_ 7 88 ay Swiss Alps ¥ == Collision OY" 2 Z0Ne ZS o lithosphere. Numbers are compressional wave velocity (km/s). for Geological Society of America, Boulder, Colorado. b) Section across the profile below velocity Karner and A. B. Watts, in Journal of Geophysical
Nevada Mountains NS ae 6.4 300 4 “62> 82° — “= 81 : 300 Basin Crusy 300 Fault and Sierra Nevada From Seismic evidence model D. Geophysical
Slerra > 200 0 i}, 6.15 SR at : 200 Malasse lari] nental 200 the San Andreas 1967). and Eaton, Cenozoic Tectonics and Regional Geophysics of the Western 1980). Geological al., ranges, by G. 1983. Redrawn by permission of the American
7 ‘ Co Mant Refraction studies from regions of continental California coast across by permission of The (Rybach et lithosphere at mountain
100 100 European 100 flexure of the ©
‘ from Range Province (Eaton, 1963, 1966; Bateman Pacific coast states, by D. P. Hill, in G. P. Eaton, © 1978. Redrawn western Alps, along the Swiss geotraverse v.88, pp. 10449-10477,
North
0 0 0 Composite section Gravity anomalies and 96
60 30- 60- FIGURE 4.19
b wy a) and of the and Research,