Welcome to.

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Welcome to.

• Seismo-Jeopardy!

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Vine and Matthews discovered magnetic patterns in
the Atlantic seafloor to build the base for this
theory

• What is plate tectonics

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similar fossils, glacial striation patterns,
identical rock layers, connected mountain ranges
and jigsaw puzzle coastlines

• What is the evidence for Continental Drift Theory

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Continents move gradually apart or together over
millions of years

• What is continental drift

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12 major pieces and many minor ones make up the
crust of the earth

• What are tectonic plates

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one plate disappears beneath another plate

• What is a subduction zone

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these tectonic plate boundaries are mostly on
seafloors

• What is a divergent (spreading) zone

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new crust material is formed here

• What is a divergent (spreading) spreading zone

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old crust material is recycled here

• What is a subduction zone

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tension is built up elsewhere because spreading
zones move two plates apart

• What causes earthquakes

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ridge push, convection currents, and slab pull
attempt to explain the cause of motion

• Why do plates move

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every 120 million years north becomes south or
vice versa

• What is a magnetic polarity reversal

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alternating bands of rocks are found in mirror
images on either side of mid-ocean ridges

• What is the evidence for spreading zones?

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The San Andreas fault is an example

• What is a transform boundary

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crust upper asthenosphere

• What is the lithosphere

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plasticky, claylike portion of the upper mantle

• What is the asthenosphere

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Its molten liquid and mostly nickel and iron

• What is the outer core

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Tension builds up on two sides of a fault at a
stick point until it suddenly slips

• How does an earthquake occur

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Friction, fault slope, and elasticity of the rocks

• What affects EQ frequency and magnitude

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Rubber bands in the model represented the
left-over potential energy

• What is an aftershock

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10-15 occur per day

• How often do EQs over magnitude 3.0 occur

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plate boundaries (mostly coastlines and mid-ocean
ridges)

• Where do most earthquakes occur

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3-800 km below the surface

• How deep are EQs

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one is the origin of the quake, and the other is
the point on the surface above it

• What are the focus and epicenter

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one side of the fault thrusts up, the other slips
down compared to the other

• What is a normal or reverse thrust fault

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one side of the fault slips laterally to the other

• What is a tranverse fault

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____________are faster and can go through solids,
liquids and gases __________ are slower and can
go only through solids

• What are p and s-waves

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If this interval is great, the epicenter is far
from the seismograph

• What is the s-p interval

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The source of energy is in the same direction as
the wave travels

• What is a compressional wave

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The source of energy is at right angles to the
direction of wave travel

• What is a transverse wave

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Region of the planet experiencing no s- or p-waves

• What is a shadow zone

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s-waves cannot get through this layer

• What is the outer core

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6.5 is roughly 30 times greater than a 5.5

• What is the Richter scale

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records the patterns of earthquake

• What is a seismograph

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intersection of three or more radii from s-p
intervals

• How are earthquakes located

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