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Geophysics includes the study of seismic waves and the earth's magnetic field,
gravity, and heat. All these things tell us something about the nature of the deep
part of the earth. Together they create a convincing picture of what makes up the
B Figure 2.4 Curved paths of seismic waves caused by uniform rock with
increasing seismic velocity with depth. (A) Path between earthquake and
recording station. (B) Waves spreading out in all directions from earthquake focus
. rock ...
Fault scarp Fault trace Fault plane' Figure 7.4 The focus of an earthquake is the
point where rocks first break along a fault; seismic waves radiate from the focus.
The epicenter is the point on the earth's surface directly above the focus.
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Introduction to Physical Geology
Terms to Remember 382
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