Geoscience Reference
In-Depth Information
Figure 3.30.
(
cont.
)
550 Ma Early Cambrian
725 Ma Late Proterozoic
Problems
1. Assume that the Earth's magnetic field is a dipole aligned along the geographic north-
south axis.
(a) What is the angle of inclination at London, U.K. (51
◦
N, 0
◦
E)?
(b) What is the angle of inclination at Canberra, Australia (35
◦
S, 149
◦
E)?
(c) What is the angle of inclination on Spitzbergen (78
◦
N, 16
◦
E)?
(d) What is the angle of inclination at Rio de Janeiro, Brazil (23
◦
S, 43
◦
W)?
(e) If the angle of inclination is 76
◦
,where are you?
(f) If the angle of inclination is
−
36
◦
,where are you?
2. Magnetic measurements have been made on some lavas found at 60
◦
N, 90
◦
W. The
angle of inclination is measured to be 37
◦
.Atwhat magnetic latitude were these lavas
erupted?
