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4 Principles of Stratigraphy
horizontality, stratigraphic superposition, lateral continuity, cross-cutting relationships
what drives plate motion?
still active research, but thermal motion of mantle is partially responsible
P-wave or compressional wave
pass through any medium
alternating pulses of compression and expansion
S or shear wave
side to side or up/down forces
not transmitted through liquids
travel slower than P-waves
how to locate earthquakes
3 stations determine distances to epicenter
EQ is where three circles intersect
the greater the interval b/w P and S wave, the farther away the EQ is
Richter Magnitude scale
intensity based on amplitudes of seismic waves on seismograph
logarithmic scale (1-10)
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